125 m³/s of a sewage is discharged in a river which is fully saturated with O, and flow at a minimum rate = 1600 m³/s with a minimum velocity of 0.12 m/s. If the 5 day BOD of the sewage is 300 mg/l. Find out where the critical DO will occur in the river. Assume coefficient of purification of river = 4.0 k₁ = 0.11/day BOD = 1.25 BOD Assume sat DO at 20° 9.2 mg/l
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- The monthly pan evaporation measured in a lake for the month of January was 16.7 cm. If the average water surface area is 2.55 sq.km, estimate the evaporation loss that month in cubic meters if the pan coefficient is 0.70?The monthly pan evaporation measured in a lake for the month of January was 16.7 cm. If the average water surface area is 2.55 km^2 , estimate the evaporation loss that month in cubic meters if the pan coefficient is 0.70?A lake is fed by a polluted stream and a sewage outfall. The stream and sewage wastes have a decay rate coefficient (k) of 0.9/day (1st order units). Assuming complete mixing and no other water losses or gains, what is the steady-state pollutant concentration as mg/L in the lake?Incoming Stream: C = 10 mg/L, Q = 90 m^3/sSewage Outfall: C = 300 ppm, Q = 0.5 m^3/sLake: V= 10,000 m^3
- In a given year, a catchment with an area of 2500 km2 received 130 cm of precipitation. The average rate of flow measured in a gauge at the outlet of the watershed was 30 m3/sec. a.) How much runoff reached the river for the year (in m)? b.) Estimate the water losses due to the combined effects of evaporation, transpiration, and infiltration due to ground water (in m), assumed that no change in storage within a year c.) What is the runoff coefficient?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 wastewater treatment plant discharges of effluent into a stream. Just upstream from the discharge point, the stream has an ultimate BOD of 5 mg/L.Assuming a cross-sectional area for the stream equal to 100 m2, what ultimate BOD (in mg/L) would you expect to find at a point of 15,000 m downstream? Wastewater Flow: 1 m3/secBOD (ultimate): 40 mg/LRiver Flow: 10 m3/secDeoxygeneation constant kd: 0.22 day-1
- An oxidation pond having a surface area of 90 000 m2 is loaded with a waste flow of 500 m3/d containing 200 kg of BOD5. The pond has a depth of 1.2 m. Determine BOD5 loading rate (kg(Ha.d) Determine hydraulic retention time (d)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.Calculate mass balance for the calculation of change in storage in the reservior? Also calculate the runoff coefficient. Given: watershed area= 4000 km2; precipitation= 102 cm/year; flow of river=34.2 m3/sec; infiltration= 5.5 x 10-7 cm/sec; evapotranspiration= 40 cm/year.
- A wastewater treatment plant will receive a flow of 30,000 m3/day. The plant has a 3.6 m deep circular primary clarifier with a surface overflow rate of 60.0 m3/m2-day.a. Calculate the surface area (m2), diameter (m), volume (m3), and hydraulic retention time of the primary clarifier.b. How long will it take a 1.0 mm particle with a density of 1500 kg/m3to settle in the primary clarifier? show all workIt takes 30 hours for water to flow from Point A to point B in a river. The flow rate and BOD5 in the river are 10 m^3/hr and 2 mg/L, respectively. A wastewater of flow rate 2 m^3/hr containing BOD5 of 30 mg/L is discharged into the river at point A. Calculate the BOD5 concentration at downstream point B by treating the river as 20 CMFRs in series with equal hydraulic detention times. The first order decay coefficient k of the BOD5 is assumed to be 0.065/hr.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?