3 The high-purity-oxygen process illustrated in Figure 12.39 is being considered for treat-ment of an unsettled domestic wastewater flow of 1.40 mgd with an average BOD of 200mg/l. Compute the aeration volume required based on a maximum allowable BOD load-ing of 130 lb/1000 ft³/day and minimum aeration period of 1.8 hr. Forthissystem,what isthe F/M ratio in terms of lb of BOD/day/lb of MLVSS, assuming an MLSS of 5500 mg/l,lotila?

The objective of the question is to calculate the aeration volume required for the…

Answered: 3 The high-purity-oxygen process…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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2. The average wastewater flow from a community of 20,000 is 125 gpcd. The 5 day, 20 deg C BOD is 250 mg/L. The suspended solids content is 300 mg/L. A final plant effluent of 50 mg/L of BOD is to be achieved through the use of two sets of identical settling tanks and trickling filters operating in parallel. The settling tanks are to be designed to a standard of 1000 gpd/^2. The trickling filters are to be 6^ deep and operated at an organic loading of 55 lbm/1000^3 d. There is no recirculalon. (1) What settling tank surface area is required? In ft^2 (2) What settling tank diameter is required? In ft (3) Estimate the BOD removal in the settling tanks? In percent % (4) What is the trickling filter diameter? In ft domeved Ward
The City of Marietta has been directed by the City Board to upgrade its primary Wastewater Treatment Plant (WWTP) to include a secondary treatment process that can meet an effluent standard of 20 mg/L of BODs and 20 mg/L of suspended solids (SS). They want to select completely mixed activated sludge system. The BOD5 of the SS is estimated to be 50% of the SS concentration. Assume L:W within 4:1 and maximum depth of 4.5 m and maximum length of 50 m for the tank. Assume the reasonable values of missing parameters from FE Exam Handbook. The effluent characteristics from the primary treatment process are: Flow = 0.150 m's, BOD5 =75 mg/L. Assume the values for the growth constants as K, = 100 mg/L BOD5, Mm = 2.5 d-1, kg = 0.05 d'1. Y = 0.50 mg VSS/mg BODs removed, MLVSS = 2,800 mg/L, MISS - 1.20 (MLVSS), wastewater temperature = 25.0°C. Assume 8% 02 transfer rate and BOD5 to BODu ratio as f = 68%. If SRT (qc) = 14.5 days, the volume of the aeration tank is nearly?
Determine how much extra volume is needed to treat the following wastewater in a CSTR than in a plug flow reactor. • Influent TOC: 273 mg/L • Required Effluent TOC: 57.0 mg/L • Flow: 792,500 gallons/day • First Order Microbiological Rate Coefficient (k’): 5.98/day Answer: 295,000 gallons 2. Discuss in detail at least two ways the k’ value may have been obtained and which technique is probably more accurate?
A sample of diluted wastewater (diluted 10 times) has a 5-day biological oxygen demand (BOD) of 5 mg/L. If the rate constant is 0.1/d, assuming a first-order chemical reaction, the ultimate BOD of the original wastewater is most nearly (A) 0.50 mg/L (B) 5.0 mg/L (C) 13 mg/L (D) 130 mg/L
This is for a water and wastewater review. It's not for a grade I just need to understand the problem, please include equations and choose one of the answer choices.
A complete mix activated sludge process treats 5 MGD of wastewater containing a total BOD5 concentration of 225 mg/L BOD5 to 20 mg/L BOD5, which is 75% soluble in both the influent and the effluent. The volume of the aeration basin is 111,400 ft3 and the MLSS concentration is 2500 mg/L. Determine the following: a) Detention time in the aeration basin (hr) b) F/M ratio c) Specific substrate utilization rate d) Substrate removal efficiency
If a manufacturing facility generates raw wastewater that is predominantly composed of dissolved and suspended solids and with ThOD of 100 mg/L, which of the following treatment equipment you could do away with? Check all that applies.
A jar test reveals that the optimum alum coagulant dose is 50 mg/L at a pH of 8.1 and a temperature of 73 F. How many pounds per day of 49% alum are required for the whole plant? Total flow is 36 MGD with four parallel treatment plants, each designed for 12 MGD. Could use some guidance on setting up the equations.
H2. Evaluate the similarities and differences between sewage treatment process against industrial wastewater treatment process in terms of typical characteristics of the influent to be treated, process treatment involved, the effluent from the system and the quality of the sludge generated from these two treatment processes.
WASTEWATER ENGINEERING A wastewater sample has 7.5 x 105 CFU per liter. The allowable fecal coli form concentration is 3500 CFU/L. What should be the length of carrying this wastewater if the flow velocity of the wastewater is 0.75 m/s and the reaction rate constant of decomposition of fecal coliform is 0.24 min-1.

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