Throughout most of history‚ the amount of waste generated by humans was insignificant due to low population density and low societal levels of the exploitation of natural resources. Common waste produced during pre-modern times was mainly ashes and human biodegradable waste‚ and these were released back into the ground locally‚ with minimum environmental impact. Tools made out of wood or metal were generally reused or passed down through the generations. However‚ some civilizations do seem to
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WASTE MANAGEMENT.... -Waste management is the collection‚ transport‚ processing or disposal‚ managing and monitoring of waste materials. The term usually relates to materials produced by human activity‚ and the process is generally undertaken to reduce their effect on health‚ the environment or aesthetics. Waste management is a distinct practice from resource recovery which focuses on delaying the rate of consumption of natural resources. All wastes materials‚ whether they are solid‚ liquid‚ gaseous
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Types of wastes : 1. Municipal Solid Waste Municipal solid waste (MSW) is generated from households‚ offices‚ hotels‚ shops‚ schools and other institutions. The major components are food waste‚ paper‚ plastic‚ rags‚ metal and glass‚ although demolition and construction debris is often included in collected waste‚ as are small quantities of hazardous waste‚ such as electric light bulbs‚ batteries‚ automotive parts and discarded medicines and chemicals. Generation rates for MSW vary from city
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cattle dung based biogas plant programme‚ it is naturalthat the quest for increasing the biogas generation in the country will lead to developingof biomethanation processes for the use of substrates other than cattle dung. At present‚most of them are treated as waste‚ garbage‚ nuisance and hazard. The improper or inadequate disposal of such wastes leads to unhealthy conditions. This becomes a sourceof pollution and a public health problem. If such waste is recycled in a biogas plant‚ itwill be a source
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Dragsters use a combination of large wide tyres or the rear and small narrow tyres on the front this combination is used for the following reasons: <br> <br><b>The front wheels:</b> <br>The front wheels are very narrow. This is so a minimum of air resistance or drag affects the dragster with lower drag better acceleration an in turn a better top speed can be achieved all leading to a better pass (race time). <br> <br>Now lets try to understand the concept of air resistance and drag. A basic example
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Garrets Flash Pyrolysis Process: This low temperature Pyrolysis process has been developed by Garrett Research and Development Company. In a 4 tonnes per day pilot plant set up by the company at La Varne‚ California‚ the solid waste is initially coarse shredded to less than 50mm size‚ air classified to separate organics / inerts and dried through an air drier. The organic portion is then screened‚ passed through a hammer mill to reduce the particle size to less than 3mm and then Pyrolysed in a reactor
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BIOMEDICAL WASTE 1)Introduction: Biomedical waste‚ also known as infectious waste or medical waste‚ is defined as solid waste generated during the diagnosis‚ testing‚ treatment‚ research or production of biological products for humans or animals. Biomedical waste includes syringes‚ live vaccines‚ laboratory samples‚ body parts‚ bodily fluids and waste‚ sharp needles‚ cultures and lancets. Biomedical waste consists of solids‚ liquids‚ sharps‚ and laboratory waste that are potentially infectious
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2.0 Plastic Waste Management Disposal of plastic waste is a serious concern in India. New technologies have been developed to minimize there adverse effect on the environment. Currently world wide accepted technology used for the plastic disposal is incineration. However‚ the incinerators designed poorly‚ releases extremely toxic compounds (chlorinated dioxins and furans) therefore‚ facing strong opposition from various non-government organizations. In India to introduce a safer disposal technology
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Review paper. Catalysts analysis for MSW pyrolysis and gasification Tursunov Obida‚ Khairuddin Md Isaa‚ Dr. Ong Soon Ana aSchool of Environmental Engineering‚ University Malaysia Perlis UniMAP‚ Arau 02600‚ Perlis‚ Malaysia Abstract MSW pyrolysis and gasification are the possible alternative to the direct use of fossil fuel energy. MSW‚ a CO2 neutral source of renewable fuel‚ can contribute to the demand for heat‚ electricity and synthesis gas (syngas). Nevertheless‚ there are inefficiencies in
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either tension devices or torsion in the form of twisted ropes. In January 332 B.C.‚ Alexander began the Siege of Tyre. While the rest of the cities on the coast of modern Lebanon had surrendered to Alexander‚ he could not leave Tyre in the hands of the Persian fleet in his rear as he took his army to Egypt. Capturing Tyre was a strategic necessity for Alexander’s war plans. Tyre‚ however‚
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