Nitrification Process in Landfill Leachate Treatment

Nitrification Process in Landfill Leachate Treatment CHAPTER 1 INTRODUCTION Overview Landfilling is one of the oldest and common methods used for waste disposal. It is perceived as the most economical and environmentally acceptable technique. It is a complex system with physical, chemical, and biological processes. While undergoing the process of wastes degradation, there is the production of highly contaminating liquid, leachate, and polluting gases. If discharged in an uncontrolled and non-engineered manner, leachate will contaminate groundwater bodies and subsequently jeopardizing the ecosystem. There is a network for the collection the contaminants. The gases such as methane and carbon dioxide are flared before they can affect the atmosphere. The leachate generated, requires treatment before discharge and it is the main problem. In Mauritius, there has been an upsurge in the amount of wastes generated due to rapid industrialization. A structure for solid waste management was necessitated which resulted in the construction of Mare Chicose Sanitary Landfill Site. Over the years, there has been an increase the volume of wastes being disposed and consequently, a rise in the amount of leachate generated. As previously mentioned, the polluting liquid requires treatment prior to disposal. Nowadays, we do have laws that are regulated by the Wastewater Management Authority Act and the organization operates under the aegis of the Ministry of Public Utilities. After treatment leachate shall comply with the standard limits for effluent discharge as shown in Appendix C. Many studies have been carried out for the treatment of leachate and various methods are available. There are several parameters that define the treatment method. The treating technique shall be efficient, cost-effective with minimum input, flexible and if possible usage of the effluent. Aim and Objectives The aim of the project is the study of the nitrification process in the treatment of landfill leachate. The project had the following objectives set: To determine the suitability and efficiency of a SBR and co treatment method for the treatment of landfill leachate. To find the concentration at which ammonia nitrogen is toxic to microorganisms. To design a suitable tank for the method being adopted. To assess the cost-effectiveness of the treating system Structure of Thesis The remainder of this thesis is organized as follows: Chapter 2: gives a brief overview of landfilling process, describing the various components of a landfill. There is a description of the Mare Chicose Sanitary Landfill Site and a summary of typical leachate effluent. Chapter 3: deals with the treating options available for wastewater treatment particularly leachate. The efficiency for ammonia nitrogen removal is outlined and a reviewing some case studies on biological treatment of landfill leachate. Chapter 4: describes the methodology adopted for leachate treatment. Chapter 5: gives a detailed analysis of the results obtained and assessment of various parameters. Chapter 6: consists of the design a treating system for leachate. Chapter 7: describes the cost effectiveness of the treatment methods and some recommendations for improvement of the designs. CHAPTER 2 REVIEW of LITERATURE 2.1. Landfill A landfill may be defined as a physical facility used for the disposal of residual solid wastes in the surface soils of the earth (Tchobanoglous et al.). Nowadays, the term sanitary landfill is more usually utilized to describe an engineered facility, designed, operated and monitored with the foremost objective of reducing environmental and health hazards. According to Tchobanoglous, a landfill may be categorized with respect to the incoming waste materials. There are various criteria that are considered before the design and construction phases. The site cannot be close to water bodies, highways, any residential areas or even airports. The main reason is the pollution accompanied by the operation of such a site which will eventually disturb its surrounding environment. Another factor is the hydrogeology of the site, groundwater maps are prepared by studying the different soil stratum. This helps in determining the permeability of the soil, the depth to groundwater, the direction of groundwater flow and hydraulic gradients. If clay is to be used as a liner, then borrow sources are found. Landfill Components Liner: It is a barrier that will prevent the leachate and other liquids from penetrating the soil. It can be made of clay, synthetic materials or both which is known as composite liner. This barrier also restricts the underground migration of landfill gases. Cap system: Usually a soil cover placed over the landfill at completion of filling, also known as final cover, with vegetation grown over it. The cover may consist of geosynthetic materials also, thus hindering the escape of landfill gases to the air and restricting the infiltration of rain into the landfill (Bagchi, 1994). Gas management system: As shown in the diagram above, these are a series of gas wells that removes methane and other decomposition gases from the landfill for flaring and reuse. The methane gas may be used in the electricity production. Leachate management system: A number of horizontal and vertical pipes placed just above the liner that drains and collects leachate. Afterwards the polluting liquid may be brought to a retention pond. Mare Chicose Sanitary Landfill Site Over the last few years, a rapid development at socio-economic levels has brought an upsurge in the amount of wastes generated in Mauritius. There was a need for an integrated solid waste management programme. The Mare Chicose Sanitary Landfill is the only waste disposal site for Mauritius till date. The site is located in the southern part of the island near a small village called Cluny. It receives mostly municipal solid wastes and therefore categorized as a Class à Ã‚ ¨ type. The site was previously operated by STAM Ltà ©e, from 1997 to 2006, and presently by Sotravic Limità ©e/ Bilfinger-Berger consortium. The amount of wastes disposed at the landfill has nearly tripled over the years, reaching to a daily value of about 1,200 tonnes. The percentage of incoming wastes is summarized below: The field capacity of the landfill was already attained and currently there is an extension of works on existing cells. The site is comprised of six cells and actually the fifth one is in use. Prior to disposal at the landfill, the wastes are compacted at transfer stations. The wastes are dumped from a tipping point and soon, they are spread over existing wastes by means of specialized vehicles. At the end of the day, a cover is placed to reduce the amount of windblown debris. Both clayey and geosynthetic liners were used on the site. The amount of leachate being carted away for the period of January 2007 December 2007 is 110 858 m3. Actually, no leachate treatment is being carried out. Among the landfill gases produced methane is the most dangerous and it is dealt with in a controlled environment. The gas is being collected by means of pipelines and subsequently flared. Leachate The definition according to EPA is as follows; â€Å"Water that collects contaminants as it trickles through wastes, pesticides or fertilizers. Leaching may occur in farming areas, feedlots, and landfills, and may result in hazardous substances entering surface water, ground water, or soil.† Leachate can be described as a highly contaminated liquid, containing a considerable amount of dissolved and suspended solids that has percolated down through wastes. The leachate quality varies throughout the operational life of a landfill and long after its closure. There are three broad and overlapping phases of waste decomposition, in which chemical and biological processes give rise to both landfill gas and leachate during and beyond the active life of the site (Carville et al.). Phase 1: Oxygen present in the wastes is rapidly consumed by aerobic decomposition. This phase has duration of less than one month and is normally relatively unimportant in terms of leachate quality. This phase is exothermic and high temperatures may be produced. If some of this heat is retained, then as a result of that the rate of the upcoming phases is increased. Phase 2: Anaerobic digestion is comprised of the following four phases; Hydrolysis: A chemical reaction where large polymers are converted to simple monomers. Acidogenesis: A biological reaction where the monomers are converted to volatile fatty acids. Acetogenesis: A biological reaction where the fatty acids are converted into hydrogen, carbon dioxide and acetic acid. Methanogenesis: The acetic acid is converted into acetates. Hydrogen is used up to convert the acetates into methane and carbon dioxide. Anaerobic and facultative microorganisms hydrolyze cellulose and other putrescible materials such as complex carbohydrates, fats and proteins to soluble organic compounds. These hydrolysis products are then fermented during acidogenesis to various intermediates such as volatile fatty acids and alcohols. Finally, these intermediates are converted during acetogenesis to acetic acid, carbon dioxide and hydrogen. The high content of putrescible material in the waste may sustain acidogenic conditions for quite some time and provide a rich feed stock for methanogens subsequently. Leachate from this acidic phase typically contains a high concentration of free fatty acids. It therefore has low pH of 5 or 6, and will dissolve other components of the wastes, such as the alkaline earths and heavy metals, which can be mobilized in the leachate, possibly as fatty acid complexes. The leachate also contains high concentrations of ammoniacal nitrogen and has both a high organic carbon concentration and a biochemical oxygen demand (BOD). Phase 3: Conditions become more anaerobic as waste degradation proceeds and methanogenic bacteria gradually become established. These start to consume the simple organic compounds, producing a mixture of carbon dioxide and methane that is released as landfill gas. The carbon dioxide tends to dissolve producing the very high bicarbonate concentrations typical of Phase 3 leachates. The rate at which this phase becomes established is controlled by a number of factors, including the content of readily putrescible waste. Since the majority of the organic compounds are high molecular weight humic and fulvic acids, the leachates are characterized by relatively low BOD values. Ammoniacal nitrogen continues to be released by areas of the waste where phase 2 is continuing and generally remains at high concentrations in the leachate. Falling redox potential immobilizes many metals as sulphides in the waste. (Source: www.wikipedia.com/leachate) Typical leachate effluent Leachate is usually termed as a high strength wastewater. The polluting liquid has a high concentration of contaminants and varies throughout the landfill age as shown in the table below. From the above table, it noticed that leachates are normally alkaline having a pH of 6.0-8.4. The average COD value is found to be 5000 mg/l and the ammoniacal nitrogen remains within a similar range 900-3000 mg/L for all most of the sites. As it has been portrayed, the leachate does not meet the requirements for discharge either in sewers or surface water (see Appendix C) and this clearly indicates a need for treatment. CHAPTER 3 Treatment Options Overview Most landfills operate their own onsite leachate pretreatment and treatment facilities. Three types of treatment are possible physical, chemical and biological. Usually they are used in conjunction with one another. The constituents of leachate and availability of resources determine the treatment method to be adopted. Therefore, it should be efficient, flexible and an economical option. The leachate quality is highly dependent on the waste materials being disposed and the stage of their anaerobic decomposition. Hence, there is a variation in the constituents concentration. It has been observed that throughout the life cycle of a landfill, the ammonia nitrogen concentration remains very high. Amongst several usual parameters, ammonia nitrogen is a key one as it influences the selection and the design of the treating system. Physical Treatment Ammonia Stripping Ammonia can be removed by the air stripping technique which consists of blowing air through the wastewater. The method is based on the following equation; The above equation is highly dependent on the pH so that an exchange of ionic forms can take place. The equilibrium constant for this reaction is 10-9.25 at 18 ° C (Sorensen, 1993). pH = 9.25 + log [NH3] / [NH4+] From the above equation a pH greater than 10 is needed for releasing the ammonia gas. At normal temperature only 2% of the gas is liberated and therefore the wastewater should be heated to increase the efficiency of the treatment process. In achieving relatively low effluent values of ammoniacal-N (e.g. Reverse Osmosis The process consists of applying a pressure to the wastewater, i.e. the leachate, which passes through a semi permeable membrane. The water molecules present in the wastewater will pass the membrane forming the permeate and the contaminants remaining are the concentrate. The main advantage of using such a system is the removal of non-biodegradable compounds such as residual COD, heavy metals and chloride ions together with other large molecules present in leachate. The concentrate produced is a major issue as it is highly toxic to the environment. It is usually recirculated in the landfill or disposed off-site for storage. The removal rate of the contaminants is usually greater than 99.6 %. The plant is usually operated in more than one stage and occupies less space when compared to other treating systems. The process is currently in use in several countries such as France, Germany and Holland (IPCC, 2007). Activated Carbon Adsorption Activated carbon is used as an adsorbent for the removal of organic compounds. It is used in one of the following forms, powdered and granular. Due to the high cost of activated carbon, it is normally utilized for polishing after biological treatment. With an optimum dose and sufficient contact time, a considerable decrease in COD and BOD concentration can be achieved by this method. In the powdered form, the carbon is meant for single use and it loses its adsorption capacity and therefore cannot be reactivated. The mixed liquor must then be treated to remove the PAC, by subsequent processes, such as coagulation, flocculation, or filtration. In the granular form, the carbon can be used again but must be removed which requires specialized equipment (IPCC, 2007). Biological Treatment Processes The treatment process is comprised of growing and reproducing microorganisms in a controlled environment to stabilize organic matter. There are two forms of growth process attached and suspended. In suspended growth treatment systems, microorganisms are maintained in suspension within the wastewater whereas in the attached growth process, the biomass grows and is retained on a medium. Attached Growth Processes Percolating filters Rotating biological Contactors (RBC) Suspended Growth Processes Aerated lagoons Activated Sludge Process (ASP) Sequencing Batch Reactor (SBR) Combined treatment with domestic wastewater (co treatment) Percolating Filters It is an aerobic biological treatment system. Wastewater flows over a fixed and inert medium to which biofilms are attached and trickles down under gravity. The medium may be made up of different materials such as plastics and gravels and the depth of the filter is normally 2-4 m. The effluent is passed through a clarifier to remove biological solids. The percolating filter has many disadvantages concerning the treatment of landfill leachate. The system is efficient mostly for the treatment of low strength leachate. A recurrent problem is the clogging of the filter media and vulnerability to shock-term load (IPCC, 2007). Rotating Biological Contactors The process consists of large diameter steel or corrugated plastic media centered around a horizontal shaft, usually placed in a concrete tank. The media is slowly rotated (mechanical or air drive). At any given time during the rotation, about 40% of the media surface area is in the wastewater. Organisms in the wastewater are attached and, multiply on the rotating media until they form a thin layer of biomass. RBC is most effective for treating methanogenic than acetogenic leachates and for concentrations of ammoniacal-N below 500mg/l. The rotating biological contactor may have operational problems, since high concentrations of degradable COD can result in excessive sludge growth, and clogging of interstices within rotors (IPCC, 2007). Aerated Lagoons Aerated lagoons are operated by a combination of aerobic and anaerobic processes. The lower part of the lagoon converts the settled solids and sludge into carbon and methane by the action of anaerobic decomposition. The upper part is usually aerated, surface aeration or by algae present, to oxidize compounds from the anaerobic zone. Effluent is withdrawn from the upper zone, generally over an overflow arrangement. For discharge into surface waters, a secondary settlement lagoon or reed bed filtration system is needed for wastewater polishing. The constraints of the system are as such it requires large space and is quite sensitive to temperature changes. There is the possibility of odurs emanating from the lagoon. The main concern is the inability to provide consistent and reliable design in order to meet the discharge limits. Activated Sludge Process It is the most widely used aerobic biological process for treatment of domestic wastewater. It operates on the basis of a continuous inflow of wastewater. The latter is completely mixed and aerated for certain period of time, giving rise to mixed liquor. For nitrification to occur the sludge age must be greater than 8 days, so that the nitrifying bacteria can grow sufficiently large in numbers to exert an oxygen demand. The mixed liquor is allowed to settle in the clarifier and the biomass is returned to the aeration tank. The clarified effluent is decanted for disposal or tertiary treatment. The ASP is a continuous process and leachate cannot be treated directly, it requires dilution due to ammonia toxicity. Sequencing Batch Reactor The reactor is a slight modification of the ASP. It operates on a fill-and-draw basis using the suspended growth process. The SBR utilizes a single tank which accommodates aerobic biological treatment, flow equalization, settlement of solids, effluent clarification and decanting. Thus, it is usually described as operating in time rather than space when compared to conventional ASP. The reactor consists and operates under the following cycles: Fill: During the fill operation, volume and substrate (raw wastewater or primary effluent) are added to the reactor. The fill process typically allows the liquid level in the reactor to rise from 75% of capacity (at the end of idle period) to 100%. During fill, the reactor may be mixed only or mixed and aerated to promote biological reactions with the effluent wastewater. React: During the react period, the biomass consumes the substrate under controlled environmental conditions. Settle: Solids are allowed to separate from the liquid under quiescent conditions, resulting in a clarified supernatant that can be discharged as effluent. Decant: Clarified effluent is removed during the decant period. Many types of decanting mechanisms can be used, with the most popular being floating or adjustable weirs. Idle: An idle period is used in a multitank system to provide time for one reactor to complete its fill phase before switching to another unit. Because idle phase is not a necessary phase, it is sometimes omitted. Advantages of the system It requires small space as a common tank is used for the various unit processes. Flexibility in operating the reactor. The reaction time can be controlled and settling can be achieved under quiescent conditions. There the elimination of the return sludge pumping when compared to the ASP. Disadvantages of the system A higher level of sophistication is required (compared to conventional systems), especially for larger systems, of timing units and controls. Potential of discharging floating or settled sludge during the draw or decant phase with some SBR configurations. Combined Treatment with Domestic Wastewater It is a combined method for treating domestic wastewater and landfill leachate. Both wastewater and leachate can be treated at suitable mixing ratios (Aktas, 2001). Domestic wastewater can provide phosphate while leachate can provide nitrogen based nutrients, thus compensating for nutrients deficiency. Hence, nutrients need not to be supplied. Leachates from older landfills have a lower BOD/COD value and a smaller biodegradable organic fraction. There may not be sufficient COD to support denitrification of nitrate, a supplementary source of organic carbon is required to ensure adequate denitrification. Synthetic chemicals, such as methanol or acetic acid, are effective but quite expensive. It is necessary to find an alternative cost effective source of easily biodegradable carbon (Zhang, 2005). The mixing ratios are determined or else there will be nitrification inhibition by the presence of excess free ammonia. Case studies for biological treatment of landfill leachate The Buckden Landfill Site has been operational since 1994 and has been successful in treating landfill leachate for more than 10 years. The landfill site uses twin sequencing batch reactors, each designed for treating up to 100 m3/day. The effluent is then treated by means of reed bed and an ozonation plant for wastewater polishing and removal of pesticides. The plant has a design loading rate of 0.02 0.040 kg N/kg MLVSS. The plant has been successful in removing ammonia nitrogen from 331 mg/L to 0.27 mg/L. Only the COD value has not met the discharge limits ( The main running costs are due to electricity for aeration and for ozonation. There is also the use of sodium hydroxide for automatic pH control, and of phosphoric acid for provision of phosphorus as a nutrient, which are relatively small costs. Another case is a South-African landfill which receives up to 2000 tonnes of MSW each day. Up to 80 m3/day of leachate are generated, which have to be treated to very high standards. The treatment system is made up of a SBR with final polishing through a reed bed planted with Phragmites. The SBR is highly efficient for ammoniacal nitrogen removal from over 1200 mg/l to less than 1.0 mg/l. COD values are reduced by 60% from raw leachate values of over 2000 mg/l (Robinson et al., 2005). CHAPTER 4 MATERIALS AND METHODS 4.1. Overview This chapter deals with the methodology adopted and is comprised of the following phases: Sampling Sample preservation Wastewater characterization Leachate Wastewater from SMTP Sludge Biological treatment of landfill leachate using a SBR Co-treatment of landfill leachate with wastewater from SMTP Testing Results and analysis Conclusions Sampling Sampling is done to represent a certain population, in this case wastewater, on which tests are performed and the results symbolize the wastewater characteristics. This can be achieved by two methods: composite sampling and grab sampling. A composite sample consists of collecting samples at regular interval in time. This will be representative of the average wastewater characteristics. A grab sample is based upon obtaining a distinct sample regardless to its flow or time of the day. If the wastewater quality is not highly variable, the results obtained from grab sampling will tend to corroborate composite ones. Both methods are used and for this project the grab sampling technique was adopted. Sample Preservation Soon after the samples were collected, they were tested and if not possible, they were preserved. The latter is crucial step as most of the wastewater constituents have to be kept as are in their original state. They were incubated at 4 ° C and when necessary pH control was done by adding sulphuric acid. Subsequently, this will stop all the biological activities. Wastewater Characterization The next step after sampling is characterization, i.e. determining the level of constituents present in the wastewater. As a fact of that, the treatment method is selected and applied to the polluting material. Each time, when new samples were obtained, they were characterized in compliance with Standard Methods of Testing. For the project, characterization has to be done for these materials; Leachate The leachates were delivered at the UOM Public Health Laboratory, on the 23rd October 2007 and 9th January 2008, and were characterized for the main polluting parameters. Then the sample was preserved till the treatment starts. Domestic Wastewater The domestic wastewater was collected at SMTP. The sample was collected from the primary clarifier after degriting has been done on the following dates: 26th February and 3rd March 27, 2008. The samples were immediately characterized and then used. Sludge For nitrification to take place there should be microorganisms feeding on the organic matter, but leachate does not contain any. Therefore, the returned sludge from SMTP was collected and brought to the UOM Public Health Laboratory. The sludge was allowed to settle and the supernatant was discarded, the residual left was used for testing. As a result of that the sludge concentration was increased and smaller amount is required for biological treatment. A TSS was carried out and the value obtained was used for calculations. The sludge was also studied under the microscope determining the microorganisms present and their conditions. Biological Treatment of Landfill Leachate using a SBR The first option for treating leachate was the biological treatment by making use of a SBR. It was made up of the following phases: fill, react, settle and decant. The reactor consisted of sludge, water and leachate with varying composition. Their volumes were calculated such that the ammonia nitrogen concentration is about 50 mg/L in the reactor. The latter was aerated for a period of 24 hours. The main polluting parameters were monitored and accentuating upon the level of ammonia nitrogen and nitrate nitrogen. The system was run for a number of cycles and then denitrification phase was operated. Experimental Procedure A reactor of capacity 20 L was considered with an MLSS concentration of 4000 mg/l. The dissolved oxygen concentration had to be greater than 2 mg/l and this was achieved by the means of air diffusers. The diffusers provided the mixing within the reactor. Immediately after the setting out of the reactor, a grab sample was collected and was tested. These values were set as baseline. After 24 hours of aeration, another sample was collected from the reactor and tests were performed. The critical parameter i.e. ammonia nitrogen was observed and if, the value is not within the discharge limits then it aerated till the expected result is obtained. The biomass required nutrients which provided in the form of Potassium Hydrogen Phosphate. In order for the treatment to take place, we had to cater for alkalinity and this was achieved by the addition of concentrated sodium hydroxide. Thus the nitrification process was being monitored until no further treatment. A total of 3 sequential batch reactors were operated. After the operation of the third reactor, the denitrification phase was initiated. All the air diffusers were switched off and acetic acid was added to the reactor. The dissolved oxygen concentration was monitored till it reached the zero value and the nitrate nitrogen concentration was measured. Co-treatment of Landfill Leachate with Wastewater from SMTP The other alternative is a combined method, treating domestic wastewater and leachate together. The treatment is biological in nature using a SBR with phases; fill, react, settle and decant. The treating system consisted of aerating the SBR, composed of sludge, domestic wastewater and leachate, for a period of 24 hours. The volume of leachate was gradually increased until no further treatment was observed. The main parameters were monitored, laying emphasis on the nitrification process. The values were recorded and analyzed. Experimental Procedure Small reactors of capacity 5 L each were considered with an MLSS concentration of 1500 mg/l. The first SBR was made up of 100% DWW and sludge only, the second one 95% DWW, 5% leachate and sludge, the third one 90% DWW, 10% leachate and sludge and so on. An example is being shown below. The dissolved oxygen concentration was kept greater than 2 mg/l by the use of air diffusers which also provided the mixing within the reactor. Immediately after the setting out of the reactor, a grab sample was collected and was tested. These values were set as baseline. After 24 hours of aeration, another sample was collected from the reactor and tests were performed.

Mary Shelley & ‘Frankenstein’ Essay

â€Å"How do the themes explored by Mary Shelley in ‘Frankenstein’ relate to a modern audience? † The beginning of civilisation brought the evidential classification of people as insiders and outsiders in any close society, due to the narrow stereotypical minds of the masses and often the simplistic facts of life. People are separated from the rest of the community as a result of perhaps their physical appearance or a difference in their personality. Stereotypical idols in today’s society are greatly influential; we are quick to identify faults in others and use this excuse to ostracise them from the world and ourselves. Mary Shelley embodies this ‘outsider’ through the monster that Frankenstein creates. He is isolated and rejected by everyone, so we are made to empathise with him; human beings have a natural instinct to do this, so the text is universalised. Ironically, at times the monster is more humane than those who consider themselves human, those who consider themselves ‘insiders’, opposed to the monster- an outsider. This novel opens on a personal note, Shelley uses the device of letters as a hook to draw in the reader; an invasion of privacy universalises the thoughts on paper, like reading someone else’s diary. This makes it easier for us to empathise to Captain Walton and subsequently Victor Frankenstein, who is very similar in many aspects to him. These two strong male characters are romanticised by Shelley make them easier to relate to in a modern audience, because they far more believable with multi- faceted personalities. They are romantic anti- heroes; their ambition intrigues us and we are able to identify with them and their achievements. The letters are deliberately left without an exact date, so as to not only create a sense of mystery but to also ensure that the story isn’t concreted to a specific era, as it relates more to society as a whole rather than a period of time. Shelley uses a high diction style of writing, which is littered with emotive adjectives to prevent it becoming stagnated and boring for the audience. The information is given to us little at a time to arouse our curiosity and make us read further into the book, where crescendos are commonly used after a more mundane part of the story, so the excitement peaks and falls throughout. An example of this is when the monster is first sighted in letter 4 where there is a dramatic climax before he disappears from view, leaving the audience in doubt of what will happen next. A prominent theme in Mary Shelley’s ‘Frankenstein’ is one of an idealistic world. Victor idealises his family, like a fairytale, too good to be true in reality, which it seems he wants to escape as he knows his family are far from perfect, and a good example of this is portrayed in the quote; â€Å"There was a considerable difference between ages of my parents, but this circumstance seemed to unite them closer in the bonds of devoted affection. † (Ch1, pg33, line7)

The Economic History of the Period of 1930 to 1980 Free Essay Example, 1750 words

When World War 2 started in 1939 USA had not recovered from the onslaught of the great depression of the 1930s. It was only from 1936 that the GDP of the USA started recovering gradually. Hence the role of government was not minimized. As war spread throughout Europe and Asia between 1939 and 1941, the role of the federal government's leadership was important in the realm of "preparedness" for war and fighting the war. Great importance was given for converting America's industrial base to produce armaments and another war materiel rather than civilian goods. "Conversion" was the key issue in American economic life in 1940-1942. The major automakers were made to convert to aircraft production. The shipbuilding industry that was languishing for years was made to revive to gear to the war needs. As a result of the conversion between 1941 and 1945, the U. S. exported about $32.5 billion worth of goods through Lend-Lease. War boom and a new wave of growth and prosperity began in the US. This was the result of the rail and road expansion in Northern Europe and America and the accompanying expansion in the coal and iron industries. We will write a custom essay sample on The Economic History of the Period of 1930 to 1980 or any topic specifically for you Only $17.96 $11.86/pageorder now The boom ended approximately in 1857 when it turned into a recession. By 1946 Government had transferred payment to welfare programs to extent of $11 billion. By 1950 this has risen to $15 billion, by 1970 this has risen to $28 billion and by 1980 by $80 billion. Farmers made $20 billion in 1944 unlike the late 1930s, which had an average of only $8 billion. The war also caused a shortage of employees. This raised the annual earnings to $44 billion compared to $13 billion in 1939. At the wartime peak in July 1944, 19 million women were employed. Child labor increased over two folds. Because of these factors, the average family income rose over 25% from 1941-1945. 1941, the national income was around $95 billion dollars in 1946 the Employment Act was passed that enabled the US government to use the tool to stabilize output and employment.

Assignment 2 PST312M - 1626 Words

Martin Minnaar Student number: 4565-391-7 Subject: PST312M – Physical education and sports coaching Semester 1: Assignment 2 Unique number: 527854 Questions 1. Briefly explain the relationship between physical education and sport. (5) 2. Which test is used to evaluate a child’s posture? Explain. (5) 3. Why is knowledge regarding the structure and functioning of the body so important to the physical education teacher and coach? (5) 4. What is integration as it relates to sport? Explain. (5) 5. Describe the teaching progression that is best suited for a child during early childhood. (5) 6. Name five instances in which a physical education teacher can be found guilty of negligence. (5) 7. Your coaching, athletes†¦show more content†¦Also during health and safety lessons may the integration of physical education be accomplished. Like for instance to measure heartbeat and breathing. And to recognise that the correct diet and exercise is important. For art and culture it can be integrated using dances and other physical skills to express feelings and ideas about themselves or the environment. Also it can be used to develop the understanding of numerous scientific concepts and principles like gravity, force and levers. Physical education can also help to explain wide bases, low centre of gravity, and Newton’s laws of motion. 5. Teaching progression during early childhood: A stage of development is not seen as a rigid or fixed set of academic, motor or social skills that must be acquired before advancing to the next stage. But it’s seen as approximate time periods in which to gain certain skills. That said, characteristics of learners in the early primary school grades have a very strong influence on selection of appropriate physical activities. These characteristics include physical immaturity, short attention span and lack of experience in games, dance and gymnastics. They therefore need broad exposure to these activities. They need to explore and discover how their bodies work. We must therefore emphasize movement concepts and skills. In grade 1 2 educators must

Greek and Roman civilizations - 1262 Words

Introduction Throughout history there have been many great empires, but none have made a greater impact than the Greek and Roman empires. These empires began as small city-states, and grew to become the powerful empires we know today. The Greek and Roman empires were not always enemies, considering the Romans were greatly influenced by the Greek culture. The two civilizations shared many similarities, but had different opinions on government operations. There are three different periods that span the history of the Greek and Roman empires; the Hellenic, Hellenistic, and Roman civilization. I will thoroughly examine the differences in religion, philosophy, societal struggles, territory expansion, trade, commerce and the decline of each†¦show more content†¦The people flowed smoothly throughout the Hellenistic kingdoms mainly because they spoke and read the same language. No matter where a person came from in the Hellenistic regions, they were able to communicate with anyone. Even with everyone connected there was still social disorder due to the sudden change in government policy. People were actively involved the self-governed democratic government of the past. Now that citizens were once again living in impersonal empires ruled by bureaucrats, they started to feel alienated. The Hellenistic art and literature expressed the feelings of the citizens. They began to sculpt and paint actual people as opposed to the gods their culture was so centered around. The citizens also began to join random religions that promised immortality and individual wealth. Even Hellenistic philosophers focused their time on preaching about individual happiness and pleasure. The Hellenistic period was an age ruled by commercialism and cosmopolitanism. The Hellenistic age ended at the Romans feet when the Roman Octavian defeated marc Anthony in the battle at Actium. Roman Empire The Roman history began with two demi gods known as Romulus and Remus. Romulus and Remus were the twin sons of Mars, the god of war. Roman history states that Romulus eventually killed his brother Remus and was the first king of Rome, named after himself. As Rome continued to develop it lost its monarchy style government in 509 B.C.E and developedShow MoreRelatedThe Roman And Greek Civilization940 Words   |  4 PagesIt is truly fascinating how two different civilizations could fabricate almost every inch of society as long as humans can remember for thousands of years into the future and beyond. From the calendar and toilet to modern roads and concrete, both the Roman and Greek civilization terraformed the world and our homes. Both civilizations also introduced a wider variety of religion, mathematics, science, art and architecture concepts, machinery, military technology and strategy, astronomy, agricultureRead MoreThe Greek And Roman Civilizations830 Words   |   4 Pages . The Greek and Roman Civilizations were quite similar in their Art, their Women’s Rights, and their Geographic location. The Greek believed their painted, sculpted and carved depictions of the people should be absolutely perfect. Especially the men. They found that the physical form was most pleasing to the eye and wanted to accentuate that beauty and deliver it through art. They sought out to present infinite elegance. 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Walter Dean Myers Amazing Author Free Essays

Raymond Palacio 4/26/12 Period 1 Walter Dean Myers is a well established author who writes compelling stories of the struggles of young adults. Walter Dean Myers became well known by his astounding achievements and amazing literature. A big part of what made Walter who he is today is his early life and how it affected his writing, his first success, his background, how his writing contributed to our youth, the controversies about him, and the fact of should his books be red in a high school. We will write a custom essay sample on Walter Dean Myers: Amazing Author or any similar topic only for you Order Now The great quality that Walter Dean Myers possesses is the quality to understand the everyday problems of children young adults; this quality was greatly mastered by events that affected Walter Dean Myers Early life and how this inspired him to write. As a child, Walter Dean Myers had speech impairment in school. This problem with his speech meant that he had trouble reading regular written or printed words. Soon after an incident in class, which involved a speech to the class, Walter Dean Myers’s teacher noticed that it was much easier for him to read his own written words. This inspired him to write poems and short stories. Later when Walter was seventeen, he dropped out of high school and served in the army for three years. The struggles of being in the army only intensified his love towards writing. Shortly after exiting the army, Walter only had low paying jobs to do such as working in post office, as a messenger, and as a factory interviewer for the New York State Bureau of Labor. To any person; these are all great examples of early life events that affected his writing and his writing style. In 1968, Walter Dean Myers challenged himself to further his love for writing by entering in a children’s book competition geared towards African American writers. Little did he know but, this competition would change his life. Walter Dean Myers decided to enter a book that he wrote called â€Å"Where Does the Day Go? † Walter’s Book won the competition, and officially became published and was also Walter’s first success in 1969. Recalling what he said that day,† I won the contest! † said Walter Dean Myers. This was the first and best achievement he has done, and once he did it, he wanted to make this his life’s work. Walter Dean Myers is without question one of the best authors of today even though he had some struggles in his life. Walter was born in the middle of the great depression in 1937. He was a born in a town called Martinsburg, Virginia. Walter’s mother died while giving birth to him, so without hesitation, Walter’s mother’s good friend to adopt. Walter’s new parents changed his middle name from â€Å"Milton† to â€Å"Dean†. Soon after the adoption, Walter and his new parents moved to Harlem in New York City. Walter became accustomed to the city life and was in school. One day in class, Walter’s teacher caught him reading a comic book; he remembered that moment very well. Walter’s teacher took the comic book and ripped it into a million pieces. He was really upset, but she brought him a giant pile of books from her personal library. Walter remembered it being the best thing that ever happened to him. Walter Dean Myers soon became a book worm and grew into a man who loved books and wrote amazing stories of the struggles of young adults. Walter Dean Myers has contributed a lot to our youth. He provides a compelling perspective on the hard-hitting issues faced by at risked teens and young adults. Walter Dean Myers can understand young adults. He makes teens, which read his books; seek to portray the beauty of the African American experience, requiring young adults to question their values and decisions. Walter Dean Myers was also elected the National Ambassador for Young Peoples Literature by the Librarian Congress for 2012 and 2013. To meet the criteria, means you have contribution to young adults and relate to children. Though Walter Dean Myers is an expressful and outspoken author for our youth, some concerned parents raised some controversies about one of Walter dean Myers’s best books, â€Å"Fallen Angles†. This controversy was challenged by Texas, Virginia, Kansas, Illinois, Idaho, and North Carolina. The book was challenged for its racism, offensive language and the violence of war. The book was also challenged for its slang terms for homosexuals. Even the though there were only a few controversies about one of Walter Dean Myers’s books, He still is an intelligent author who understands and relates to young adults. Many schools over go the one question of whether Walter Dean Myers’s books should be read in their high schools. With out a doubt this author is the perfect role model to influence young adults; in what any better way than a high school library. The role of the modern high school library is run by a librarian and this librarian has to go through vigorous amounts of schooling and English degrees. The librarian decides what should be allowed into the library and is a very influential person when it comes to references and connections to the modern societies’ literature. Our schools sometimes have to ban some books but not many have been banned. If a book is challenged, the book then will go through different stages to determine whether it is truly an inappropriate book for our youth. But with Walter Dean Myers, you will not find a better insight on the struggles of today’s youth. The famous Walter Dean Myers is truly an influential figure and a great author that decisively depicts the struggles of today’s youth and young adults. His work has continuously acknowledged today’s generation of youth and writes compelling struggles of young adults. Walter Dean Myers grew up to be an amazing, aspiring, writer and has truly proven to everyone that he indeed has unlocked that secret to understanding young adults. Anyone reading one of his books will grasp the terminology and theme of which is written in his multiple award winning books. All in all Walter Dean Myers is and will always be one of the greatest authors of today’s literature aiming for the younger age group, such as young adults and children. How to cite Walter Dean Myers: Amazing Author, Papers

Industrial Organization Lend Lease Group Stapled

Question: Discuss a bout theIndustrial Organization for Lend Lease Group Stapled. Answer: External Factors Affecting Lend lease Group Stapled. According to the Sydney Morning Herald, strong housing demand has created investment opportunities for lend lease group.Notably,lendlease revenue has doubled to $3.9 billion thus illustrating how external forces of demand affect lend lease company performance.Noteworthy,lendlease operations havent been affected by financial credit restrictions and growth of lending in various economic sectors.[1]Moreover, demand for residential dwelling in Australia is likely to affect lend lease output. In addition, population growth which is a social and economic factors has affected the lend lease group operation by increasing the demand for infrastructure and property in Australia.Significantly,population growth translates to increase in demand for a commodity thus the need for increased supply by producer firms like the lend lease group stapled.Further,political and economic environment in Asia and the United states Of America have permitted lend lease group operations in their respective areas through project awards[2]. Further, cancellation of the East west Link project due to political and legal economical reasons reduced the profit margin of lend lease group despite subscribing to other contracts. In addition, the stock exchange fluctuation and market weakness in the construction industry has slightly affected lend lease earnings.Also, the predicted slowdown in residential presale is less likely to affect lend lease earnings. Sustainability is part of lend lease fundamental strategies[3]predominantly, lend lease performance history has been guided by environmental, social and economic outcomes. Notably, urbanisation, construction investments factors have been influenced lend lease operations through internal risk assessment and management initiatives. According to Steve Maccan, lendlease group chief executive officer, all the company operations are geared towards benefiting the environment, society and the economy.Primarily, environmental, social and economic factors are analyzed by the lend lease, sustainability framework.Noteworthy,lendlease group is a supporter of the better build green movement thus proof of its environmental corporate responsibility. Further,Lendlease group internal operations are affected by global reporting G4 recommendations, sustainability world Index proposed by Jow Dones,global real estate sustainability guidelines and listing rules formulated by the Australian stock exchange hence the assertion of external factors affecting the overall performance of lend lease group of companies operations[4].For profit maximization and strategic interaction,Lendlease uses surveys, media campaigns,meetings,conferences to connect and expand their customer base.[5] Additionally, there is a monitoring supply chain framework to uphold human, environmental and legal rights.Naturally, macroeconomic conditions of any business environment are likely to affect the performance of firms in that area.However, the general lend lease performance hasnt been affected by the Australian lower construction figures in the year 2015.Notably,the lend lease group stapled is an Infrastructure and property investment company with its head quarters in Sydney, Australia. The lend lease company is a multinational company with branches all over the world.Inevitably,environmental,political,social and legal factors affects any company operations. Legal policies and measures are observed during setting up of a firm in any country through industry legislation and registration requirements and Lend lease group of companies is no exception given its global nature of business. Bibliography. Big Idea.Lendlease Corporate Social Responsibility. The Big idea, 2016. https://www.thebigidea.co.uk/lendlease-corporate-social-responsibility/ C, Cummins.Lendlease Profit Boosted by Australian Developments.(The Sydney Morning Herald,2016) https://www.smh.com.au/business/property/lendlease-profit-boosted-by-australian-developments-20150823-gj6175.html