A conventional activated-sludge system treats 11,000 m3/day of wastewaterin an aeration tank with a volume of 3400 m3. The BOD after primary clarification is 180mg/l. Given the operation conditions below, calculate the  sludge residence timeMLVSS in the rector = 2,100 mg/lMLSS = (1.25)*MLVSSQw = 160 m3/daySVI = 125 mL/g (Ans.  SRT = 7.0 days)

Structural Analysis
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Chapter2: Loads On Structures
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A conventional activated-sludge system treats 11,000 m3/day of wastewater
in an aeration tank with a volume of 3400 m3. The BOD after primary clarification is 180
mg/l. Given the operation conditions below, calculate the  sludge residence time
MLVSS in the rector = 2,100 mg/l
MLSS = (1.25)*MLVSS
Qw = 160 m3/day
SVI = 125 mL/g

(Ans.  SRT = 7.0 days)

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