A meat processing factory's raw effluent has a five day BOD at 20°C of 1760 mg/l. If the k value is 0.15/day determine the BOD at two and four days at 20°C. a. A stream with a flow of 1.7 m/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20°C). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20°C throughout, kı for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day. b.

A meat processing factory's raw effluent has a five day BOD at 20°C of 1760 mg/l. If the k value is 0.15/day determine the BOD at two and four days at 20°C. a. A stream with a flow of 1.7 m/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20°C). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20°C throughout, kı for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day. b.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.6P

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A stream with a flow of 1.7 m3/s and BOD 3.4 mg/l is saturated with DO (9.27 mg/l at 20oC). It receives a treated effluent discharge from a cocoa processing factory of BOD 6780 kg/day and DO of 5.0 mg/l. The BOD of the stream immediately after mixing is 7.6 mg/l. The DO at a point 36 km downstream is 7.20 mg/l. The average velocity of the stream flow is 0.2 m/s. Determine the flow and the BOD in mg/l of the treated effluent discharged from the cocoa processing factory into the stream. Assume the temperature is 20oC throughout, k1 for effluent/water mixture is 0.1/day, k2 for stream is 0.4/day.
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?
Problem 5.27 Suppose the only source of BOD in a river is untreated wastes that are being discharged from a food processing plant. The resulting oxygen sag curve has a minimum value of DO somewhere downstream equal to 3.0 mg/L See figure P 5.27. Just below the discharge point, the DO of the stream is equal to the saturation value of 10.0 mg/L. By what percent should the DO of the wastes be reduced to assure a healthy stream with at least 5.0 mg/L of DO everywhere? Would a primary treatment plant be sufficient to achieve this reduction? Assume that a primary treatment plant removes 35% of BOD. If the stream flows 60 miles per day, has a reaeration coefficient kr equal to 0.80/day, and has a deoxygenation coefficient kd of 0.20/day, how far downstream (miles) would the lowest DO occur? What ultimate BOD (L0 mg/L) of the mixture of river and waste just downstream from the discharge point would cause the minimum DO to be 5.0 mg/L? d.Sketch the oxygen sag curve before and after treatment…
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2 A groundwater (Q1 = 5.0 L/s) reaches a point of convergence (mixing) in a river (Q = 1.0 m3/s) where an industrial wastewater discharge (Q2 = 10 L/s) also converges. /s). If the groundwater has ferrous iron with concentration [Fe2+] = 10.0 mg/L, the industrial wastewater has organic matter with concentration TOC = 50 mg/L, determine the COD of the river downstream of the mixing point.
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Poorly treated municipal wastewater is discharged to a stream. The river flow rate upstream of the discharge point is Qus = 8.7 cubic meters per second. The discharge occurs at a flow of Qd = 0.9 cubic meters per second and has a BOD concentration of 50 mg/L. Assuming that the upstream BOD concentration is negligible. (a) What is the BOD concentration just downstream of the discharge point, after mixing? (b) If the stream has a cross-sectional area of 10 square meters, what would the BOD concentration be 50 km downstream? BOD is removed with a first-order decay rate constant equal to 0.20/day.
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A stream flows through a small town where an industry dischargesits effluent into the stream. Upstream characteristics prior to industrial discharge are as follows: fow rate 1000 m3/d, BOD5 2.5 mg/L,nitrates 2.0 mg/L, and temperature 19°C. The industry dischargesat 50 m3/d. According to regulatory requirements, the maximumallowable values in the stream following any discharge are BOD5 30mg/L, nitrates 4.0 mg/L, and temperature differential of 4°C fromupstream conditions. Calculate the maximum allowable values forthe industrial discharge.
ENVIRONMENTAL ENGINEERING-WATER POLLUTION: The ultimate BOD of a river just below a sewage outfall is 50.0 mg/L, and the DO is at the saturation values of 10.0 mg/L. The deoxygenation rate coefficient, kd is 0.30/day, and the reaeration coefficient, kr is 0.90/day. The river is flowing at a speed of 48 miles per day. The only source of BOD on this river is this single outfall. FIND: The critical distance downstream at which DO is a minimum. The minimum DO. If a wastewater treatment plant is to be built, what fraction of BOD would have to be removed from the sewage to assure a minimum of 5.0 mg/L everywhere downstream?