A tannery with a wastewater flow of 0.011 m’/s and a BOD5 of 590 mg/L discharges into the Cattaraugus Creek (Nemerow, 1974). The creek has a 10-year, 7-day low flow of 1.7 m³/s. Upstream of the tannery, the BOD, of the creek is 0.6 mg/L. The BOD rate constants k are 0.115 d-' for the tannery and 3.7 d' for the creek. The temperature of both the creek and the tannery wastewater is 20°C. Calculate the initial ultimate BOD after mixing. Answers: LoTannery = 1,349.2 mg/L, L.Creek = 0.6 mg/L, L, = 9.27 or 9 mg/L

A tannery with a wastewater flow of 0.011 m’/s and a BOD5 of 590 mg/L discharges into the Cattaraugus Creek (Nemerow, 1974). The creek has a 10-year, 7-day low flow of 1.7 m³/s. Upstream of the tannery, the BOD, of the creek is 0.6 mg/L. The BOD rate constants k are 0.115 d-' for the tannery and 3.7 d' for the creek. The temperature of both the creek and the tannery wastewater is 20°C. Calculate the initial ultimate BOD after mixing. Answers: LoTannery = 1,349.2 mg/L, L.Creek = 0.6 mg/L, L, = 9.27 or 9 mg/L

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A tannery with a wastewater flow of 0.011 m3/s and a BOD5 of 590 mg/Ldischarges into the Cattaraugus Creek (Nemerow, 1974). The creek has a10-year, 7-day low flow of 1.7 m3/s. Upstream of the tannery, the BOD5of the creek is 0.6 mg/L. The BOD rate constants k are 0.115 d21 for thetannery and 3.7 d21 for the creek. The temperature of both the creek andthe tannery wastewater is 208C. Calculate the initial ultimate BOD aftermixing.
The town of Pittsburgh discharges 0.126 m3/s of treated wastewater intoCherry Creek. The BOD5 of the wastewater is 34 mg/L. Cherry Creek hasa 10-year, 7-day low flow of 0.126 m3/s. Upstream of the wastewater outfallfrom Pittsburgh, the BOD5 is 1.2 mg/L. The BOD rate constants k are0.222 d21 and 0.090 d21 for the wastewater and creek respectively. Thetemperature of both the creek and the municipal wastewater is 208C. Calculatethe initial ultimate BOD after mixing.
2. A manufacturing plant is discharging wastewater into a stream at a constant rate of 2.0 m/sec. The concentration of a contaminant in the wastewater is given as 50 ppm. The average stream flow upstream of the discharge point is 6.0 m³/sec, and an upstream contaminant concentration of 4 ppm. The average depth of the stream is given as 1.5 m and the average width is given as 25 m. The contaminant is removed by a first-order reaction with a rate coefficient of 0.35 /day. Assume the stream behaves as a plug-flow system. a. Draw a diagram and write the appropriate (starting) mass balance equation(s).} See pdf O Not sure how to proceed b. Calculate the concentration of the contaminant in the stream at the discharge point and at 25 km downstream. At the dischrage point: mg/L 25 km downstream: mg/L
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
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.
The Lo value just downstream from a sewage outfall is 60 mg/L. The DO saturation levelat that point is 9 mg/L. Given a deoxygenation rate coefficient of 0.28 / day and a rearationrate coefficient of 0.8/day. Determine a. The critical distance downstream assuming the sewage outfall is the only source ofBOD for the river and that it flows at 50 miles / day. b. the minimum DO c. thet fraction of the BOD that would have to be removed by a waste water treatmentplant to ensure > 5 mg/L everywhere downriver.
A tannery with a wastewater flow of 0.011 m½ and a BOD; of 590 mg/L discharges into a creek. The creek has a 10-year, 7-day low flow of 1.7 m^3/s. Upstream of the tannery, the BOD5 of the creek is 0.65 mg/L. The BOD rate constant k is 0.115 d-^1for the tannery and 3.7 d-^1 for the creek. The temperature of both the creek and the tannery is 20°C. Calculate the initial ultimate BOD after mixing.
A slaughterhouse with a wastewater flow of 0.011 m³/s and a BOD5 OF 590 mg/L discharges into Simpang Kanan River. The river has a 7-day low flow of 1.7 m³/s. Upstream of the slaughterhouse, the BOD5 of the river is 0.6 mg/L. The BOD rate constant k are 0.115 d-¹ for the slaughterhouse and 3.7 d−¹ for the river, respectively. The temperature of both river and the slaughterhouse wastewater is 28°C. Calculate the initial ultimate BOD after mixing. Provide TWO (2) suggestions to reduce the water pollution at Simpang Kanan River.
4.6 Poorly treated municipal wastewater is discharged to a stream. The river flow rate upstream of the discharge point is Qu = 8.7 m³/s. The discharge occurs at a flow of Q₁ = 0.9 m³/s and has a BOD concentration of 50.0 mg/L. Assume the upstream BOD concentration is negligible. (a) What is the BOD concentration just downstream of the discharge point? (b) If the stream has a cross-sectional area of 10 m², what is the BOD concentration 50 km downstream? (BOD is removed with a first-order decay rate constant equal to 0.20/day.)
A 80 km^2 lake (surface area) has an inflow from streams of 25 m^3/s with Cpin is 0.08 mg/L. A municipal wastewater plant discharges its treated effluents with a flow rate of 0.2 m^3/s and a Cpin of 40 mg/L. Assume the settling rate Vs is 45 m/year. Determine the permissible wastewater influent concentration if the maximum Cp allowable in the lake is 0.06 mg/L. Select one: O a. 6.36 mg/L O b. 1.55 mg/L O c. 15.51 mg/L O d. 31.81 mg/L
7-24. The town of Pittsburgh discharges 0.126 m³/s of treated wastewater into Cherry Creek. The BOD, of the wastewater is 34 mg/L. Cherry Creek has a 10-year, 7-day low flow of 0.126 m³/s. Upstream of the wastewater out- fall from Pittsburgh, the BOD, is 1.2 mg/L. The BOD rate constants k are 0.222 d-' and 0.090 d¯' for the wastewater and creek respectively. The temperature of both the creek and the municipal wastewater is 20°C. Cal- culate the initial ultimate BOD after mixing.
The town of Viracocha discharges 17,360 m³/day of treated wastewater into the Pachacamac Creek. The treated wastewater has a BOD5 of 12 mg/L and a BOD decay constant, k, of 0.12/day at 10 °C. Pachacamac Creek has a flow rate of 0.43 m³/s and an ultimate BOD, Lo, of 5 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L. Compute the DO and the initial ultimate BOD, Lo, after mixing. Draw the Mass Balance Diagram.