'Leachate' from a municipal solid waste landfill contains:
Choose the correct answer
Clean water with no contaminants
Highly polluted liquid (high BOD, COD, ammonia, heavy metals, pathogens) from water percolating through landfill
Only CO2 and methane gas
Pure groundwater
Correct Answer
B. Highly polluted liquid (high BOD, COD, ammonia, heavy metals, pathogens) from water percolating through landfill
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Leachate: liquid percolating through MSW, carrying dissolved organic matter (high BOD/COD), ammonia nitrogen, heavy metals, volatile fatty acids, chlorides, sulphates, and pathogens. Fresh landfill leachate: very high BOD/COD ratio (BOD5/COD > 0.5). Old landfill: lower BOD/COD (refractory organics dominate). Treatment: aerobic/anaerobic + tertiary.
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