An existing single-stage rock trickling filter treats a wastewater flow of 3785 m/d ("raw" influent BOD, = 240 mg/L), but it cannot meet the effluent limitation of 30 mg/L BODS. The actual effluent concentration is 65 mg/L. The existing system is operated without recycling. i) Design this biological treatment system by estimation of the volume of the existing rock trickling filter in m. ii) To reduce the effluent BOD, to 30 mg/L, an engineering firm proposed the addition of a second – stage tricking filter (the same dimension as the first-stage). Is this going to work? (show your calculation). ili) If the proposed two-stage system was operated with a recirculation (Q, = Q) in both filters, what will be the effluent BODS in mg/L from the two-stage system? 100 100 E, E, = - 0.532 W W. 1+0.532, 1+ 1-E, V,F,
An existing single-stage rock trickling filter treats a wastewater flow of 3785 m/d ("raw" influent BOD, = 240 mg/L), but it cannot meet the effluent limitation of 30 mg/L BODS. The actual effluent concentration is 65 mg/L. The existing system is operated without recycling. i) Design this biological treatment system by estimation of the volume of the existing rock trickling filter in m. ii) To reduce the effluent BOD, to 30 mg/L, an engineering firm proposed the addition of a second – stage tricking filter (the same dimension as the first-stage). Is this going to work? (show your calculation). ili) If the proposed two-stage system was operated with a recirculation (Q, = Q) in both filters, what will be the effluent BODS in mg/L from the two-stage system? 100 100 E, E, = - 0.532 W W. 1+0.532, 1+ 1-E, V,F,
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:An existing single-stage rock trickling filter treats a wastewater flow of 3785 m/d ("raw" influent
BOD, = 240 mg/L), but it cannot meet the effluent limitation of 30 mg/L BODS. The actual effluent
concentration is 65 mg/L. The existing system is operated without recycling.
i) Design this biological treatment system by estimation of the volume of the existing rock
trickling filter in m.
ii) To reduce the effluent BOD, to 30 mg/L, an engineering firm proposed the addition of a
second – stage tricking filter (the same dimension as the first-stage). Is this going to work?
(show your calculation).
ili) If the proposed two-stage system was operated with a recirculation (Q, = Q) in both filters,
what will be the effluent BODS in mg/L from the two-stage system?
100
100
E,
E, = -
0.532
W
W.
1+0.532,
1+
1-E, V,F,
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