what is the rate limiting element in activated sludge design?

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Ally Wells answered 1 year ago

Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD...

Design a set of activated sludge aeration tanks. The flow rate to treat is 5.6 MGD and the BOD concentration is 150 mg/L. The design solids concentration (X) at steady-state is 2,000 mg/l. The design MCRT is 7 days. The kinetic coefficients are as follows: K = 2 g BODg cells⋅d, Ks = 25 BOD/L, Kd = 0.06 day-1, Y = 0.5 g BODg cells⋅d. The influent ammonia concentration is 40 mg/l and nitrification is needed. It takes 1400 ft3of...

Design an activated sludge treatment unit with the following data for a town of population of...

Design an activated sludge treatment unit with the following data for a town of population of 80,000: B.O.D. of raw sewage = 200 mg/l. Per capita Average sewage flow is 180 liters. B.O.D. removal in primary treatment = 60%, Raw sludge retained in ASP = 25% Effluent water should have NO BOD at all to satisfy National Standards.

Two types of flow regime are normally used in the design of an activated sludge process,...

Two types of flow regime are normally used in the design of an activated sludge process, namely completely mixed and plug flow (both are continuous). Using first order kinetic reaction, demonstrate which flow regime provide a better performance, given the followings: Q = 550 m3/d t = 6 hours Co = 225 mg/L k = 0.15 d-1

A completely mixed activated sludge process is to be used to treat a flow rate of...

A completely mixed activated sludge process is to be used to treat a flow rate of 2.5 MGD. Design a rectangular activated sludge reactor with a 4:1 ratio of length to width. (design only 1 reactor for all flow). The effluent from the plant must not exceed 15 mg/L of BOD5. Use the following design criteria: a. BOD5 influent = 250.0 mg/L b. MLVSS (X) = 3500 mg/L c. Reactor depth = 11 ft d. Effluent BOD5 must be less...

What is an activated sludge system and what are the processes that occur in the system?...

What is an activated sludge system and what are the processes that occur in the system? What is the role of "mixed liquor suspended solids"? (hint: draw the system diagram and think about what can be happening)

1-S0 in an activated sludge process represents _________________________ concentration. 2-X in an activated sludge process represents...

1-S0 in an activated sludge process represents _________________________ concentration. 2-X in an activated sludge process represents ___________________________ concentration. 3-Biomass present in the influent is a product of biomass concentration in the influent multiplied by ______________ ___________. 4-Hydraulic detention time is a ratio of ______________ and _________________. 5- ___________________ represents the portion of microorganisms discharged from the process.

Design an aeration tank for activated sludge wastewater treatment designed to meet an effluent standard of...

Design an aeration tank for activated sludge wastewater treatment designed to meet an effluent standard of 10 mg/L BOD5. The flow from the primary effluent is 10 m3/min with a primary effluent BOD5 of 250 mg/L. The design calls for the suspended solids to equal 3500 mg/L for an SRT of 5 days. The decay rate constant is 0.03 day-1 and the yield is 0.75 mg/mg. Determine: the tank volume required to meet these specifications, the resulting mass of sludge...

Volume of an activated sludge tank 12. The total design flow is 15,000 m3/day. The NPDES...

Volume of an activated sludge tank 12. The total design flow is 15,000 m3/day. The NPDES limit is 25/30. Assume that the waste strength is 170 mg/L BOD after primary clarification. Y = 0.55 kg/kg, X=MLSS = 2200 mg/L, XR = 6,600 mg/L, Recycle (R) = 0.25, kd = 0.05 day -1, qc = 8 days Make whatever other assumptions are needed. The volume the tank in m3 will be?

What happens with the degradation of substrates in activated sludge if you add a clarifier. The...

What happens with the degradation of substrates in activated sludge if you add a clarifier. The activated sludge retention time is 0.5 days and the sludge age is 2 days. Also, what if the sludge age is 4 days

Why aeration is important for activated sludge process? What would be the effect on the DO...

Why aeration is important for activated sludge process? What would be the effect on the DO profile with time (provide a sketch) and BOD removal and sludge production if: Pumping more air than the required amount

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