A stream carries a flow of 2000 m3/day withTDS concentration of 650 mg/l. At a point, 100m3/day of industrial wastewater isdischarged into the stream with a TDSconcentration of 500 mg/l. Find out theresulting TDS concentration in the stream afterindustrial waste is completely mixed with thestream flow. No accumulation takes place

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Answered: A stream carries a flow of 2000 m3/day…

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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The discharge from the Renenutet sugar beet plant causes the DO at the critical point to fall to 4.0 mg/L. The Meskhenet Stream has a negligible BOD and the initial deficit after the river and wastewater have mixed is zero. What DO will result if the concentration of the waste(L_w) is reduced by 50%? Assume that the flows remain the same and that the saturation value of DO is 10.83 mg/L in both cases.
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.
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.
The ultimate BOD of two wastewaters is 280 mg/L but their K values are 0.1/d and 0.23/d at 20oC. Calculate 5-day BOD for each of the wastewater. What you conclude based on your answer?
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.
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…
A reactive chemical disposed of by dilution in a river dissipates at a uniform rate of 0.15 mg/lper hour. The waste discharge is 7 million gallons per day containing 35 mg/l, while thestream has zero concentration with a flow above the sewer outfall of 102 ft3/s. If the meanvelocity in the river is 0.8 ft/s, calculate the distance downstream that the chemical residual persist.
A University was opened on 21st March 2021. Due to the high number of students who reported at the main campus, there was waste water dischare into the universities River with dissolved oxygenconcentration of 2.0 mg/l at a discharge rate of 1.10m3/s from the stabilization ponds. After two days, there was another discharge downstream with dissolved concentration of 2.1 mg/l at a discharge rate of 1.20m3/s. After 1 hour a different discharge of waste with dissolved oxygen concentration of 0.5 mg/l at a discharge rate of 1.10m3/s was discharged in the River immediately after the second discharge point. The River that was receiving the waste had initial DO equal to 8.3mg/l, a constant flow of 8.70m3/s, and the temperature of 20' C. The saturated value of dissolved oxygen DOs at 20 ‘C is normally 9.09 mg/l. Just below the point where a continuous first discharge of pollution mixes with a river, the BOD was 10.9 mg/l. Using a deoxygenation constant of 0.20/day, an average flow of the mixture…
You are building a wastewater lagoon with an inlet/outlet flow rate of 3,100 m3/day. The BOD inlet load is 26 mg/L and you need to achieve 12 mg/L at the outlet. The half-life of BOD is 2.4 days. What is the volume required for the lagoon? If the wastewater stopped entering the lagoon and was replaced by freshwater, how long would it take for the outlet BOD concentration to reach 1 ppm?
The density of water at 4°C is 1000 kg/m3 at atmosphericpressure. The gravity acceleration constant (g) is 9.81 m/s2. Thespecific gravity of an industrial wastewater (SGww) is 1.32. Whatis the specific weight of this wastewater?
Civil, Environmental Laboratory determinations of an industrial wastewater indicate that its ultimate BOD is 750 mg/L and the k value at 20°C is 0.20 day¹. Calculate the 5-day BOD. What would be the 5-day BOD, if k value dropped to 0.1 day ¹?Note: Ultimate BOD=L=L,
A small industrial plant discharges wastewater into a stream. The plant discharge has a flow rate of 0.2 m3/s and a BODu concentration of 40 mg/L. The stream receiving the discharge has a flow rate of 1.3 m3/s and a BODu of 6 mg/L. Downstream of the discharge point, the velocity in the stream is 0.15 m/s. Assuming no other sources of BOD enter the stream, what is the BODu remaining in the stream 10 km downstream of the plant discharge? Use k = 0.23 day-1.

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