Chemical coagulation and sedimentation of a raw municipal wastewater using 60 mg/l of FeCl3 and 50 mg/l of CaO precipitates 230 mg/l of suspended solids and 8 mg/l of phosphorus. What is the weight ratio of iron applied to phosphorus removed? Calculate the weight of organic-chemical sludge solids per million gallons of wastewater treated using the method in Section 13.2 for organic matter and Eqs. (14.6) and (14.7) for chemical precipitates. If the sludge has an 8.0% solids concentration, compute the volume of waste in gal/mil gal of wastewater processed.
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