Wastewater is treated with an activated sludge plug flow reactor, similar to one seen at the Norman Water Reclamation Facility. The BOD5 after primary treatment is 100mg/L and the effluent limit is 5 mg/L BOD5. Use 1.00 h-1 as the maximum specific growth rate constant and typical values for the other biokinetic constants. The biomass concentration in the reactor is 2,500 mg/L MLSS based on a recycle ratio of 1. Calculate the mean cell residence time, in hours for this system

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A: According to given data CFSTR Volume= 45 m3Constant flow in reactor= m3/d 6g/L stock tracer solution…

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Q: P.C. V, X, S S.C. Qs Xg, Sp Act. Sludge Basin RAS Q, S, Xp WAS Qw, Sun Xw

A: 1. V=5222 m3   2. Qw=121.8 m3/day   3. Qe=25798.2 m3/day   4. t=4.8 hours

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A: 1 % SOLID CONTENT

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A: Consider the given equation rs=-k1s2XS2+KsWhere,X=VSS concentration in the reactorAlsok1=8 mg DOCmg…

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A: Given, Degradable contaminant flow,D0=90 mg/lFlow rate = 100 m3/dReactor Volume V=200 m3kd=1.0 d-1

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A: Q = 600 m3hr y = .65 kd = .055 /day So = 140 mgl Se = 20 mgl θc= 10 days

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.