for A W.W.T.P of daily flow 30,000 m³ with raw BOD = 300 ppm and return sludge = 25% of sewage flow Design Aeration tanks if organic load dosent exceed 540 gm/m³ /d %3D
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- Determine ultimate BOD for a wastewater having 5 day BOD at 20o C as 160 mg/L. Assume reaction rate constant as 0.2 per day (base 10).H2. Consider the treatment of a wastewater with the following characteristics: T = 25°C, total flow 650 m3/d, wastewater composition: sucrose (C12H22O11): C = 400 mg/L, Q = 250 m3/d, acetic acid (C2H4O2): C =940 mg/L, Q = 350 m3/d a) Estimate the methane production, from the anaerobic degradation of the discharge using the Buswell equation, in m3/d b) Calculate the total concentration of the residual water in terms of COD, the total mass flow of COD in the residual water (kg/d) and estimate from this last data the production of methane, in m3/d.Please calculate the theoretical OD, COD, and ultimate BOD of a wastewater containing (a) 500 mg/L acetate (CH3COOH), which is fully biodegradable; or (b) 500 mg/L oil (C40H80), which is not biodegradable.
- Q/ Find the BOD of trickling filter effluent if the BOD of raw sewage is 250 mg/l with 125% recirculation. The flow is 3.15 m/min and tank volume 860 m .Assume 35% BOD is removed by primary sedimentation tank using the NRC equation.Assume that taal lake is 100m2 and its average height is 5ft. Wastewater thatflows into the lake are the following: a. Food square kitchen waste 5m3/hr; Total Dissolved Solids (TDS) is 50g/L whichoperates 8hrs per dayb. CIH 5m3/hr kitchen waste; TDS is 20mg/L which operates 4hrs per dayc. PCH 20m3/day diluted laboratory waste ; TDS = 40mg/L (1)Determine the volume of wastewater which taal lake can still be contained withoutrainfall.(2)During operational hours a heavy rain fall, the rain gauge reading is 1.5m. Will the taalLake overflow? What is the volume of water that will over flow?(3). Compute the TDS concentration of the overflow.A tannery of processing plant with a wastewater flow of 0.011 cu.m/s and a BOD5 of 590 mg/L discharges into the river. The river has a 10 year, 7-day low flow of 1.7 cu.m./s. Upstream of the tannery, the BOD5 of the river is 0.6 mg/L. The BOD rate constants (k) are 0.115 day-1 for the tannery and 3.7 day-1 for the river. Calculate the ultimate BOD of the tannery wastewater, in mg/L. a. 1,972 mg/L b. 2,155 mg/Lc. 1,350 mg/L d. 1,264 mg/Le. None of these
- A pharmaceutical wastewater needs a minimum BOD/N/P of 100/3.0/0.7 for biological treatment. The wastewater characteristics are BOD = 740 mg/l, suspended solids = 250 mg/l, soluble nitrogen = 10 mg/l, and soluble phosphorous = 5 mg/l. What ammonium nitrate and phosphoric acid additions would you recommend to ensure adequate nutrients for a daily flow of 28 m3/d?A 76000 m'id domestic waste discharge has a concentration of 22 mg/L of ammonia nitrogen. If the receiving stream contains 1.5 mg/L and the maximum allowable concentration is 3.5 mg/L, compute the dilution of streamflow required in m'/s.What is the ultimate BOD 24 km downstream from the outfall? > Answer: 3.89 g/m3 What is the DO deficit 24 km downstream of the effluent discharge? > Answer: 3.192 g/m3 Question: At the location 15 km downstream of the effluent discharge, how much oxygen would have to be added to have the do at 7 mg/l?
- A primary clarifer removes 35% of BOD5 and 55% of suspendedsolids from the incoming wastewater. Calculate the mass of solidsand mass of BOD5 removed in kg/d for a plant processing 4500 m3/dof wastewater with 275 mg/L BOD5 and 400 mg/L SS.Please calculate the ThOD, COD, and ultimate BOD of a wastewater containing (a) 500 mg/L acetate (CH3COOH), which is fully biodegradable; or (b) 500 mg/L oil (C40H80), which is not biodegradable.You are constructing a sewage lagoon with a 3,100 m3/day inlet/outlet flow rate. You must attain a BOD outflow load of 12 mg/L given a BOD inlet load of 26 mg/L. BOD has a half-life of 2.4 days.What volume is needed for the lagoon and how long would it take for the output BOD concentration to reach 1 ppm if freshwater started to replace the wastewater that was previously entering the lagoon?