QEP Practice Questions - Qualified Environmental Professional Exam

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A wastewater treatment plant is experiencing a sudden increase in the concentration of ammonia in its effluent. The plant uses an activated sludge process for biological nutrient removal. Which of the following is the most likely cause of the high ammonia levels?

A decrease in the hydraulic retention time (HRT) An increase in the mean cell residence time (MCRT) A sudden decrease in the influent BOD A drop in the dissolved oxygen (DO) concentration in the aeration basin

Correct Answer:

A drop in the dissolved oxygen (DO) concentration in the aeration basin

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