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Leachate is a highly contaminated liquid that forms when water percolates through waste materials in landfills or waste disposal sites, extracting soluble, suspended, and colloidal materials from the waste. It is considered one of the most significant environmental hazards associated with waste disposal because it can carry a complex mixture of contaminants that have serious implications for soil, groundwater, and surface water quality. The composition of leachate varies depending on the type of waste, age of the landfill, climatic conditions, and the type of landfill management practices adopted. Understanding the contaminants present in leachate is essential for designing effective treatment and disposal methods. One of the primary contaminants in leachate is organic matter, which is often measured as Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD). High levels of BOD and COD indicate the presence of biodegradable and non-biodegradable organic compounds, which can lead to oxygen depletion in receiving water bodies, harming aquatic life. Organic __________ ______ ___ ___ _____.
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