An activated sludge system (sketched below) is operating at equilibrium with the following information. Wastewater related data: flow rate=500 m³/hour, influent BOD = 150 mg/L, effluent BOD = 10 mg/L. Aeration tank related data: hydraulic retention time = 8 hours, mean-cell-residence time = 240 hours, volume = 4000 m³, mixed liquor suspended solids = 2000 mg/L. Influent Aeration Tank Sludge Recycle Secondary Clanfier Effluent Solids Wasted The food-to biomass (F/M) ratio (in kg BOD per kg biomass per day) for the aeration tank is

An activated sludge system (sketched below) is operating at equilibrium with the following information. Wastewater related data: flow rate=500 m³/hour, influent BOD = 150 mg/L, effluent BOD = 10 mg/L. Aeration tank related data: hydraulic retention time = 8 hours, mean-cell-residence time = 240 hours, volume = 4000 m³, mixed liquor suspended solids = 2000 mg/L. Influent Aeration Tank Sludge Recycle Secondary Clanfier Effluent Solids Wasted The food-to biomass (F/M) ratio (in kg BOD per kg biomass per day) for the aeration tank is

Structural Analysis

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Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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Question

An activated sludge system (sketched below) is operating at equilibrium with the following
information. Wastewater related data: flow rate=500 m³/hour, influent BOD = 150 mg/L, effluent BOD
= 10 mg/L. Aeration tank related data: hydraulic retention time = 8 hours, mean-cell-residence time
= 240 hours, volume = 4000 m3, mixed liquor suspended solids = 2000 mg/L.
Influent
Aeration
Tank
Sludge Recycle
Secondary
Clanfier
Effluent
Solids
Wasted
The food-to biomass (F/M) ratio (in kg BOD per kg biomass per day) for the aeration tank is

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The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The F/M ratio is nearly?
After primary treatment, a municipal wastewater contains 150 mg/L BOD5. The wastewater flow of 0.44 m³/s (10 MGD) is then treated in an activated sludge system with an SRT of 12 d and an HRT of 6 h. Given the biokinetic parameters tabulated below, determine the aeration volume (m³). Parameter Value 3d¹ 60 mg/L BODs 0.10 d¹ 0.6 mg VSS/mg BOD5 Hmax Ks ka Y
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An activated sludge wastewater treatment system was designed and operated in a steadystate under the following conditions:• Reactor volume of 10,000 m3in total;• Sludge concentration (MLSS) of 3200 mg/L in the reactor;• Return sludge concentration at 8000 mg/L (the underflow of the secondary clarifier)• Each day, 400 m3 of underflow sludge (return sludge) was wasted as excesssludge;What is the average Sludge Residence Time (SRT)?
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