Problem Solved: MLSS Problem - Wastewater Math

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This question comes from the California Wastewater grade 3 certification exam sample questions that can be found here: http://www.swrcb.ca.gov/water_issues/programs/operator_certification/docs/3ques.pdf

The problem reads:
An activated sludge plant generally operates well with an F/M Ratio of 0.65 lbs COD/day/lb MLVSS. Given the following information, show a determination of the concentration of MLSS that should be maintained:

Average Plant Flow Rate 4.0 MGD - Normal RAS Flow Rate 2.0 MGD
Aeration Basin Volume 1.25 MG
Final Clarifier Volume 0.5 MG
Primary Effl. COD Conc. 300 mg/L - Final Effl. COD Conc. 56 mg/L
Primary Effl. SusSol. Conc. 105 mg/L - Final Effl. SusSol Conc. 20 mg/L
% Volatility of MLSS 70

Видео Problem Solved: MLSS Problem - Wastewater Math канала American Water College