Using a per capita contribution of 120 gpcd of water containing a BOD of 0.2 lb and a suspended solids of 0.24 lb, calculate the quantity of sludge solids and volume of waste sludge produced per person using a biological filter plant and two different activated-sludge plants. The plants are as follows:
1. Biological filtration
The primary clarifier removes 50 percent solids and 35 percent BOD with 5 percent sludge solids concentration. The k-value for the filter is 0.31 and the effluent solids are 30 mg/l.
2. A conventional activated sludge plant
The plant has a primary clarifier that removes 50 percent solids and 30 percent BOD with 5 percent sludge solids concentration and 8-hr detention time with 1500 mg/l MLSS. The effluent solids arc 20 mg/l. The sludge is a blend of primary at 5 percent and thickened waste activated sludge at 4 percent solids.
3. An extended aeration plant
There is no primary clarifier. The basin has 24 hr of detention time and 1200 mg/l. Sludge wasted from the secondary clarifier contains 1 percent solids.
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