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     EduGorilla 
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    A conventional Activated Sludge Plant treating 1000 m3/d of municipal waste water disposes of its anaerobically digested sludge on relatively impervious farmland. Use the following data.

    1. Raw Sewage SS = 225 mg/L (70% volatile)
    BOD = 190 mg/L
    (Excess activated sludge returned to primary)
    2. Primary Settling  SS – 50% removal
    BOD – 30% removal
    3. Excess Activated Sludge  0.4 g VSS produced per gram BOD applied
    (80% volatile of total)
    4. Anaerobic Digester    Digested Sludge Concentration – 60%
    Sludge Specific Gravity -1
    5. Application on farmland   2 m3/hectare – d

    Area requirements (hectare) for disposal of the sludge on farmland shall be

    Options :-

    1. 2.95
    2. 1.95
    3. 0.95
    4. 0.55
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