ABC Wastewater Treatment Class II Practice Questions - ABC Wastewater Treatment Operator Class II Certification Exam

Which formula correctly calculates Solids Retention Time (SRT) for an activated sludge plant?

(MLSS times aeration volume) divided by (WAS rate times WAS concentration plus effluent TSS times flow) (MLSS divided by aeration volume) times WAS rate (WAS rate times WAS concentration) divided by (MLSS times aeration volume) (MLVSS divided by influent BOD) times aeration time

Correct Answer:

(MLSS times aeration volume) divided by (WAS rate times WAS concentration plus effluent TSS times flow)

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