An activated-sludge wastewater plant with primary clarification treats 10 mgd of wastewater with a BOD of 240 mg/l and suspended solids of 200 mg/l.
(a) Calculate the daily primary and waste-activated sludge yields in pounds of dry solids and gallons, assuming the following: 60% SS removal and 35% BOD reduction in primary settling; a primary sludge concentration of 6.0% solids; an operating food/microorganism ratio of 1:3 in the aeration basin; and a solids concentration of 15,000 mg/l (70% volatile) in the waste-activated sludge,
(b) What would be the solids content of the sludge mixture if the two waste volumes were blended together?
(c) If the waste activated is thickened separately to 4.5% solids before blending, what would be the combined sludge volume and solids content?
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