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1) A conventional water treatment plant treats an average flow of 0

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1) A conventional water treatment plant treats an average flow of 0.22 m3

 /s. The total suspended solids (TSS) concentration in raw (river) water averages 88 mg/L. The TSS removal through sedimentation and filtration processes is 97%. Alum is used for coagulation/sedimentation purpose. The average dosage of alum is 26 mg/L. Assume the aluminum ion is completely converted to aluminum hydroxide, (a) Compute the average production of alum sludge. (MW: Al = 27, S = 32, O = 16, and H = 1). (b) Estimate the volume of residual produced daily, assuming the specific gravity of 4.0% solids is 1.02.