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Civil Engineering PE

Category - Wastewater

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If septicity occurs in a gravity thickener, which of the following actions would not likely improve the situation?

Aerate the thickener feed
Add chlorine or hydrogen peroxide
Decrease the underflow pumping rate
Decant the thickener feed

Explanation

Answer: C - If septicity occurs in a gravity thickener, decreasing the sludge pumping rate would not likely improve the situation. Septicity is characterized by floating solids, foul odors and reduced underflow currents, and occurs when solids have been stored too long in a gravity thickener. A decreased underflow pumping rate may increase the solids deposition in the tank.

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