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Green Plumbing

Category - Caring for Our Water

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What is one of the key byproducts of the primary wastewater treatment process?

Pesticide residue
Algal bloom
Sewage sludge
Bacterial derivatives

Explanation

Answer: C - Sewage sludge is one of the predominant byproducts of the first stage of wastewater treatment. Such sludge forms a semi-solid layer on the bottom of wastewater settling tanks. After it is isolated, it is further treated with biological and/or chemical methods to render it usable for application on land or for disposal.

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