using thCNKTormulas.4 Consider the feasibility of treating the wastewater from the town of Nancy (Problem12.31) in a single-stage trickling-filter plant, as diagrammed in Figure 12.21, using high-density cross-flow media with a specific surface area of 42 ft²/ft³. Use the same filter sur-face area as calculated for stone-media filtration in Problem 12.31 (A = 4600 ft²) and arecirculation ratio of 0.5. The design wastewater temperature is 15°C. As determined fromlaboratory testing, the soluble (filtered) BOD of the primary effluent is 100 mg/l or less,compared to the unsettled unfiltered BOD of 160 mg/l. The soluble effluent BOD concen-tration of trickling-filter plants treating similar wastewaters is approximately 50% of theunfiltered BOD concentration. From pilot-plant studies and full-scale experience, themanufacturer of the cross-flow media recommends a reaction-rate coefficient at 20°C of0.0030 (gpm/ft2)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the solu-ble effluent BOD and double this value for the estimated effluent BOD.

The objective of the question is to calculate the soluble effluent BOD (Biochemical Oxygen Demand)…

Answered: using thCNK Tormulas. 4 Consider the…

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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A secondary treatment using a mixed water activated sludge system, having the flow rate of 10000m^3/day of municipal wastewater. BOD after primary clarification is 150mg/L.It is desired to not reach 5mg/L of soluble BOD in effluent. The kinetic values of the system having X=0.5kg/kg and Kd=0.05d^-1.MLVSS concentration in the secondary treatment is 3000 mg/L, the concentration in return sludge is 10000mg/L.By choosing two optimum sludge age, find the volume of the reactor.
Consider the feasibility of treating the wastewater from the town of Nancy (Problem 12.31) in a single-stage trickling-filter plant, as diagrammed in Figure 12.21, using high- density cross-flow media with a specific surface area of 42 ft/ft³. Use the same filter sur- face area as calculated for stone-media filtration in Problem 12.31 (A = 4600 ft²) and a recirculation ratio of 0.5. The design wastewater temperature is 15°C. As determined from laboratory testing, the soluble (filtered) BOD of the primary effluent is 100 mg/l or less, compared to the unsettled unfiltered BOD of 160 mg/l. The soluble effluent BOD concen- tration of trickling-filter plants treating similar wastewaters is approximately 50% of the unfiltered BOD concentration. From pilot-plant studies and full-scale experience, the manufacturer of the cross-flow media recommends a reaction-rate coefficient at 20°C of 0.0030 (gpm/ft²)0.5 for a media depth of 6.6 ft (2.0 m). From these data, calculate the solu- ble effluent…
A secondary treatment using a mixed water activated sludge system, have the flow rate of 10000m^3/day of municipal wastewater. BOD after primary clarification is 150mg/L.It is desired to not reach 5mg/L of soluble BOD in effluent. The kinetic values of the system having X=0.5kg/kg and Kd=0.05d^-1.MLVSS concentration in the secondary treatment is 3000 mg/L, the concentration in return sludge is 10000mg/L. Calculate the mass of solid that must be wasted each day for each of the selected sludge.
A treatment plant treats water at an average daily flowrate of 2.7 m3/s. The water is chlorinated before it flows into a 15000 m3 reservoir. The water flowing into the reservoir has a chlorine concentration of 3 mg/L. Chlorine decays at a rate of 0.24 h-1. Assume the reservoir is well-mixed and the system is at steady-state condition. (a) Determine the chlorine concentration at the discharge point of the reservoir. (b) The treated water flows from the reservoir into a transmission main. The pipe carrying the water has a diameter of 2 m and flows full. In the transmission main, chlorine decays at a rate of 0.19 h-1. Determine the concentration of chlorine 2 km from the treatment plant.
A wastewater with a BOD of 25mg/L is discharged through an outfall to a freshwater stream of mean velocity 0.1m/s. The DO downstream of the outfall is 8.5mg/L. Assume the deoxygenation rate is 0.25/d, the reaeration rate is 0.4 /d and the temperature of 20 degree C (DOs = 9.09mg/L). Compute for the ff: a) Critical distance b) minimum DO c) Oxygen deficit d) Critical time
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 aeration time is nearly?
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?
1) Design a UASB reactor to treat wastewater at 30°C from a food processing plant. The wastewater fow rate is 500 m3/d with a solubleCOD concentration of 6000 mg/L. The design parameters are asfollows:Reactor effectiveness factor (E) = 0.85Upfow velocity = 1.2 m/hOrganic loading rate = 12 kg sCOD/m3 ·dY = 0.08 kg VSS/kg CODkd = 0.03 d–1μmax = 0.25 d–1Ks = 360 mg/LHeight for gas collection = 3 mUsing the given information, determine the following:a. The reactor area and diameterb. The reactor liquid volumec. Liquid depth and total height of the reactord. The average SRT (assuming 97% degradation of sCOD)
D Q1: Design an activated sludge process to treat a wastewater of 15000 m³/day with a BOD5 of 180 mg/l following primary treatment. The effluent BODs and SS are to be 20 mg/l. Assume Xr-15000 mg/l, X=2500 mg/l, ec=10 days, y=0.60, Kd=0.05. Determine the reactor volume, the sludge production rate, the circulation rate, the hydraulic retention time and oxygen required?
A secondary clarifier handles a total flow of 9600 m³/d from the aeration tank of a conventional activated-sludge treatment system. The concentration of solids in the flow from the aeration tank is 3000 mg/l. The clarifier is required to thicken the solids to 12000 mg/l, and hence it is to be designed for a solid flux of 3.2 kg/m²h. The surface area of the designed clarifier for thickening (in m², in integer)
The design engineer proposes a fully mixed aeration tank (reactor) with a volume of 25 cubic meters. The wastewater from the community has an average flow rate of 0.009 m3/s and an influent substrate concentration of 300 mg/L as COD. The design safety factor is to be 20. Tests on the wastewater shows that the concentration of settled sludge from the secondary clarifier will be 12,000 mg VSS/L. The reactor kinetic constants are uMAX = 0.4 hr-1, KS = 75 mg/L as COD, Y = 0.4 g VSS/g COD, and kd = 0.004 hr-1. Calculate: a. What is the hydraulic residence time of the reactor? b. What is the minimum allowable sludge age? c. What is the design sludge age? d. What is the biomass concentration in the aeration tank. e. What is the COD concentration in the aeration tank. f. What is the substrate utilization rate (U)? g. What is the food to microorganism ratio (F/M)? h. What is the recycle ratio and recycle flow rate? i. What is the sludge wasting flow rate? j. What is the sludge production rate.
4.15 A gas-condensate reservoir has an areal extent of 200 acres, an average thickness of 15 ft, an average porosity of 0.18, and an initial water saturation of 0.23. A PVT cell is used to simulate the production from the reservoir, and the following data are collected: Condensate Produced from Separator (moles) Wet Gas Pressure Produced (psia) (cc) Wet Gas 4000 (dew point) 3700 3300 0. 0.75 400 0.77 0.0003 450 0.81 0.0002 The initial cell volume was 1850 cc, and the initial gas contained 0.002 moles of condensate. The initial préssure is 4000 psia, and the reservoir temperature is 200°F. Calculate the amount of dry gas (SCF) and condensate (STB) recovered at 3300 psia from the reservoir. The molecular weight and specific gravity of the condensate are 145 and 0.8, respectively.

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