If a sewer carrying a discharge of 3 cumec outfalls into a river having a discharge of 10 cumec and DO equal to 9.1 mg/L the resultant DO of the mix is 1.7 mg/L 2. 5 mg/L 3. 6 mg/L 4. 8 mg/L
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- 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/L4.6 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.)The treated domestic sewage of a town is to be discharged in a natural stream with following data given: (i) Population = 50,000 (ii) BOD contribution per capita = 0.07 kg/day (iii) BOD of stream on u/s side = 3 mg/It. (iv) Permissible maximum BOD of stream on d/s side = 51 (v) Dry weather flow of sewage = 140 litres per capita per day 5 mg/lt. (vi) Minimum flow of stream = 0.13 m3/sec Choose the correct statement(s): BOD of treated sewage should be 8.21 gm/lt. Total BOD produced per day is 35000 kg/day C BOD of untreated sewage is 500 mg/It. Correct Option D Percentage treatment required is 98.358% Correct Option
- 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?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.At the point of mixing of a river and a wastewater point discharge, DO is 5.5 mg/L and DOs is 10.1 mg/L. Upstream, the BODu of the river is 3.2 mg/L and its volumetric flow rate is 3.2 m3/s.a) Calculate the maximum allowable volumetric flow rate of the wastewater dischargeif the maximum allowable BODu at the mixing point is 20.0 mg/L. The BODu of the wastewater is 250.1 mg/L.b) For a water temperature of 15 ℃, calculate kd and kr. At 20 ℃, kd is 0.30 per day. The combined stream and wastewater velocity and depth are 2.0 m/s and is 4.0 m.c) Calculate the critical time in days and critical distance in km.d) Calculate the maximum deficit and minimum DO in mg/L
- A municipal wastewater treatment plant processes an average of 14,000 m3 / day. The peak flow is 1.75 times the average. The wastewater contains 190mg/L BOD and 210 mg/L suspended solids at an average flow and 225 mg/L BOD and 365 mg/L suspended solids at peak flow. Determine the following for a primary clarifier with a 20-m diameter. Assume eff. BOD of 20 mg/L and effluent TSS of 30mg/L for average and peak flows. 1. Surface overflow rate and the approximate removal efficiency for BOD 5 and suspended solids @ average flow. 2. Surface overflow rate and the approximate removal efficiency for BOD 5 and suspended solids @ peak flow. 3. Mass of solids (kg/day) that is removed as sludge from average and peak flow conditions.A storm sewer is mixed into a small stream. The stream before the mixing point has a NaCi concentration of 25 mg/L. If the storm sewer has a Nacl concentration of 1.8 g/L and the storm sewer flowrate is 2.5 L/min, calculate for the concentration of the salt in the stream after the discharge point (mixing point). The stream has a flowrate of 2.6 cu.m/s. Assume a complete mixing of the storm sewer flow and the stream flow. Assume also that the salt is nonreactive and that the system is at steady state.For an activated sludge basin with a flow rate of 500 L/s if the influent BOD5 = 100 mg/L, the MLVSS = 3000 mg/L and the volume of the aeration basin = 766100 gallons Find the F/M ratio If the WAS X= 10000 mg/L, find the WAS flowrate (m3/d)
- A circular primary clarifier processes 5005 cubic meters of municipal wastewater every day. The overflow rate is 35m³/m²d. The diameter of the clarifier shall beYou 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?A storm sewer is mixed into a small streams. the stream before the mixing point has a NaCl concentration of 25 mg/L. If the storm sewer has a NaCl concentration of 1.8 g/L and the storm sewer flowrate is 2.5g/ L min, calculate for the concentration of the salt in the stream after the discharge point( mixing point). The stream has a flowrate of 2.6 cu m/s. assume a complete mixing of the storm sewer flow and the stream flow. assume also that the salt is nonreactive and that the system is at steady state