Question 2 ) A primary wastewater treatment uses centrifugation for dewatering of primary sedimentation sludge. The raw wastewater contains 300 mg/L TSS and 250 mg/L BOD5. The average daily flow to the treatment plant is 5000 m3/day. In primary sedimentation basin, TSS removal is 55%, and BOD5 removal is 30% of the incoming flow. The primary sludge contains 3.5 % solids. The TSS and BOD5 capture efficiency of centrifugation is 90 % each, and the moisture (water) content of the sludge cake is 70 %. Assume the specific gravities of the primary and sludge cake are 1.01 and 1.06 g/cm3. a) Calculate the primary sludge flowrate (underflow rate) (m3/day). b) Calculate sludge cake flowrate (m3/day).
Question 2 ) A primary wastewater treatment uses centrifugation for dewatering of primary sedimentation sludge. The raw wastewater contains 300 mg/L TSS and 250 mg/L BOD5. The average daily flow to the treatment plant is 5000 m3/day. In primary sedimentation basin, TSS removal is 55%, and BOD5 removal is 30% of the incoming flow. The primary sludge contains 3.5 % solids. The TSS and BOD5 capture efficiency of centrifugation is 90 % each, and the moisture (water) content of the sludge cake is 70 %. Assume the specific gravities of the primary and sludge cake are 1.01 and 1.06 g/cm3.
a) Calculate the primary sludge flowrate (underflow rate) (m3/day).
b) Calculate sludge cake flowrate (m3/day).
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