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     EduGorilla 
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    A completely mixed activated sludge process is used to treat a wastewater flow of 1 million litres per day (1 MLD) having a BOD5 of 200 mg/L. The biomass concentration in the aeration tank is 2000 mg/L and the concentration of the net biomass leaving the system is 50 mg/L. The aeration tank has a volume of 200 m3.

    What is the average time for which the biomass stays in the system?

    Options :-

    1. 5 h                   
    2. 8 h                   
    3. 2 days              
    4. 8 days
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