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Question

Do the  byproducts of wastewater treatment plants have any commercial value? [2 MARKS]


Solution

Naming: 1 Mark
Reasoning out: 1 Mark

By-products of wastewater treatment are sludge and biogas.Now,sludge is produced when 
solids waste like faeces settle at the bottom of tank during sedimentation when this sludge is .decomposed by the anaerobic bacteria,  biogas is produced.
 Sludge contains nitrogen, phosphorus and organic matter and is used as agricultural manue. Biogas is low cost energy utilised by homes. Hence both have high commercial utility.


Chemistry

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