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P1. An oxidation ditch activated sludge system receives 7500 m³/d of municipal wastewater from the primary clarifier stage with a soluble BOD of 210 mg/L. The oxidation ditch (bioreactor) is 3 m deep, 7 m wide and 200 m long. It is operated at 1800 mg/L biomass (MLSS), with biological constants of Y = 0.5 and ka = 0.06 d¹. Determine the sludge age for 90% BOD removal. Influent ♡ Return sludge Effluent P2. A single aerated lagoon 5800 m³ volume receives a wastewater flow of 2500 m³/d with 300 mg/L BODs. If the steady-state MLSS in the lagoon (biomass cells) is 400 mg/L, determine: (a) the detention time, (b) volumetric organic loading rate (BODs/day/m³), and (c) the F/M ratio. P3. Consider the wastewater data in P2 (above). If the BOD kinetics is first order with k = 1.3 d'¹, determine the effluent BODs concentration (mg/L) for: a) Single lagoon, and b) Two lagoons in series. P4. A municipal wastewater with a flow rate of 3785 m³/d and BODs of 280 mg/L is to be treated by a two-stage trickling filter system in series. The first filter remove 60% of the BOD, and the final effluent should not be more than 30 mg/L BODs. Determine the overall removal BOD efficiency at 20°C. What will happen to this efficiency if temperature drops to 10°C?

P1. An oxidation ditch activated sludge system receives 7500 m³/d of municipal wastewater from the primary clarifier stage with a soluble BOD of 210 mg/L. The oxidation ditch (bioreactor) is 3 m deep, 7 m wide and 200 m long. It is operated at 1800 mg/L biomass (MLSS), with biological constants of Y = 0.5 and ka = 0.06 d¹. Determine the sludge age for 90% BOD removal. Influent ♡ Return sludge Effluent P2. A single aerated lagoon 5800 m³ volume receives a wastewater flow of 2500 m³/d with 300 mg/L BODs. If the steady-state MLSS in the lagoon (biomass cells) is 400 mg/L, determine: (a) the detention time, (b) volumetric organic loading rate (BODs/day/m³), and (c) the F/M ratio. P3. Consider the wastewater data in P2 (above). If the BOD kinetics is first order with k = 1.3 d'¹, determine the effluent BODs concentration (mg/L) for: a) Single lagoon, and b) Two lagoons in series. P4. A municipal wastewater with a flow rate of 3785 m³/d and BODs of 280 mg/L is to be treated by a two-stage trickling filter system in series. The first filter remove 60% of the BOD, and the final effluent should not be more than 30 mg/L BODs. Determine the overall removal BOD efficiency at 20°C. What will happen to this efficiency if temperature drops to 10°C?

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P2. A single aerated lagoon 5800 m³ volume receives a wastewater flow of 2500 m³/d with 300 mg/L BODs. If the steady-state MLSS in the lagoon (biomass cells) is 400 mg/L, determine: (a) the detention time, (b) volumetric organic loading rate (BODs/day/m³), and (c) the F/M ratio.

P1. An oxidation ditch activated sludge system receives 7500 m³/d of municipal wastewater from the primary clarifier stage with a soluble BOD of 210 mg/L. The oxidation ditch (bioreactor) is 3 m deep, 7 m wide and 200 m long. It is operated at 1800 mg/L biomass (MLSS), with biological constants of Y = 0.5 and ka = 0.06 d¹. Determine the sludge age for 90% BOD removal. Influent ♡ Return sludge Effluent P2. A single aerated lagoon 5800 m³ volume receives a wastewater flow of 2500 m³/d with 300 mg/L BODs. If the steady-state MLSS in the lagoon (biomass cells) is 400 mg/L, determine: (a) the detention time, (b) volumetric organic loading rate (BODs/day/m³), and (c) the F/M ratio. P3. Consider the wastewater data in P2 (above). If the BOD kinetics is first order with k = 1.3 d'¹, determine the effluent BODs concentration (mg/L) for: a) Single lagoon, and b) Two lagoons in series. P4. A municipal wastewater with a flow rate of 3785 m³/d and BODs of 280 mg/L is to be treated by a two-stage trickling filter system in series. The first filter remove 60% of the BOD, and the final effluent should not be more than 30 mg/L BODs. Determine the overall removal BOD efficiency at 20°C. What will happen to this efficiency if temperature drops to 10°C?
Transcribed Image Text:P1. An oxidation ditch activated sludge system receives 7500 m³/d of municipal wastewater from the primary clarifier stage with a soluble BOD of 210 mg/L. The oxidation ditch (bioreactor) is 3 m deep, 7 m wide and 200 m long. It is operated at 1800 mg/L biomass (MLSS), with biological constants of Y = 0.5 and ka = 0.06 d¹. Determine the sludge age for 90% BOD removal. Influent ♡ Return sludge Effluent P2. A single aerated lagoon 5800 m³ volume receives a wastewater flow of 2500 m³/d with 300 mg/L BODs. If the steady-state MLSS in the lagoon (biomass cells) is 400 mg/L, determine: (a) the detention time, (b) volumetric organic loading rate (BODs/day/m³), and (c) the F/M ratio. P3. Consider the wastewater data in P2 (above). If the BOD kinetics is first order with k = 1.3 d'¹, determine the effluent BODs concentration (mg/L) for: a) Single lagoon, and b) Two lagoons in series. P4. A municipal wastewater with a flow rate of 3785 m³/d and BODs of 280 mg/L is to be treated by a two-stage trickling filter system in series. The first filter remove 60% of the BOD, and the final effluent should not be more than 30 mg/L BODs. Determine the overall removal BOD efficiency at 20°C. What will happen to this efficiency if temperature drops to 10°C?

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