Alum at a dosage of 100 mg/l is added to a conventional secondary aeration process for 90% removal of total phosphorus. The settled wastewater entering the aeration tank has the following characteristics: BOD = 130 mg/l, SS = 120 mg/l, and organic phosphorus (oP) = 1.9 mg/l plus inorganic phosphorus (iP) =4.0 mg/l for a total phosphorus (tP) = 5.9 mg/l. The effluent has the following characteristics: BOD = 10 mg/l, SS = 10 mg/l, and IP = 0.5 mg/l. The aeration process is operated at an F/M ratio of 0.30 lb of SS/lb of BOD applied. Calculate the weight ratio of aluminum to phosphorus applied to the aeration process. Determine the biological-chemical solids in the waste-activated sludge in milligrams per liter of wastewater treated. (For help, review the procedures under Section 14.9 and Example 14.3.)
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