Discuss the various contaminants present in leachate?

Leachate is the liquid that percolates through waste in a landfill, absorbing soluble or suspended materials from it. As the waste decomposes, water infiltrates the landfill, interacting with the solid waste and forming leachate. The contaminants present in leachate are numerous and can vary depending on the composition of the waste, the age of the landfill, the climate, and other factors. However, several common categories of contaminants are typically found in leachate, which are broadly classified into organic and inorganic pollutants.

Organic Contaminants

1. Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD): BOD and COD are critical indicators of the organic material content in leachate. High levels of BOD suggest the presence of biodegradable organic matter, primarily from food waste, paper, and other organic materials. COD represents the total chemical substances that can be oxidized in leachate, reflecting the presence of both biodegradable and non-biodegradable organic compounds.

2. Volatile Organic Compounds (VOCs): VOCs in leachate are often derived from petroleum ___ _______ ___ ___ ________ _________ ________ ______.
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