Question
What are the byproducts of wastewater? Do they have any commercial value? [2 MARKS]
Answer:
:
Naming: 1 Mark
Commercial value: 1 Mark
By-products of wastewater treatment are sludge and biogas. Sludge is produced whensolids wastes like faeces settle at the bottom of the tank during sedimentation. When this sludge is decomposed by anaerobic bacteria, biogas is produced.
Sludge contains nitrogen, phosphorus and organic matter and is used as agricultural manure. Biogas is low-cost energy utilized by homes. Hence both have high commercial utility.
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:
Naming: 1 Mark
Commercial value: 1 Mark
By-products of wastewater treatment are sludge and biogas. Sludge is produced whensolids wastes like faeces settle at the bottom of the tank during sedimentation. When this sludge is decomposed by anaerobic bacteria, biogas is produced.
Sludge contains nitrogen, phosphorus and organic matter and is used as agricultural manure. Biogas is low-cost energy utilized by homes. Hence both have high commercial utility.
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