A domestic wastewater with 200 mg/l of BOD, 240 mg/l of SS, and 10 mg/l of P is treated by extended aeration without primary sedimentation at a loading of 12.5 lb of BOD/1000 ft3/day and an aeration period of 24 hr. Alum dosing for phosphate precipitation is graphed in Figure 14.6. What is the alum addition in milligrams per liter required for 80% phosphorus removal? Estimate the biological-chemical solids produced per million gallons of wastewater processed using the technique presented in Section 13.2 for biological waste and Eqs. (14.5) and (11.34) to approximate the amount of chemical precipitate. Compute the volume of sludge in gal/mil gal of wastewater treated, assuming a solids content of 1.5%.
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