A rectangular tank 18 m x 8 m x 4m of water depth treats 4 million litres of water per day. The detention time for tank will be hours.
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- You are asked to design a rectangular clarifier for a wastewater treatment plant. The clarifier is designed to settle 2,000 m3/day with an overflow rate of 32m3/m2-day. If the tank is 2.4 m deep and 4.0 m wide, what should the length and detention time be?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…Two rectangular settling tanks are each 30.5 ft wide 98.75 ft long, and 19 ft deep. Each is used alternately to treat 2315 m3 in a 480 minute period. Compute the detention time in hours
- The average hourly water consumption per person is 2.5 Liters anf there are 264 people in the area. Determine the following. a. the minimum rate of flow in L/s in the spring b. Total Daily water demand in L/day c. Determine if its daily yield is sufficient to the water demand of the community if the rate of flow of the spring is 0.182L/s d. the height of the cylinder in cm thatt the minimum discharge can fill within 300 secs. diameter of the cylinder is 10 cmA waste treatment lagoon having 3 cells, each 115,000 m2 in area, a minimum operating depth of 0.6 m, and a maximum operating depth of 1.5 m, receives 1,900 m3/d of wastewater having an average BOD5 of 122 mg/L. What is the BOD5 loading and detention time? The following data applies: the slope of the lagoon walls is disregarded in the calculations. a. 6.7 kg/ha-d, 54.5 daysb. 20.2 kg/ha-d, 163.4 daysc. 18.5 kg/ha-d, 177.6 daysd. 18.5 kg/ha-d, 54.5 dayse. None of theseConsider a rectangular wastewater treatment pond having a length of 100 ft,width of 20 ft, and depth of 20 ft. Assume the discharge from a wastewater treatment plant has aflow of 30 MGD with a solids concentration of 5 mg/L.a) Determine the mass flow rate of solids discharged in ton per day?b) Calculate the residence time of the pond in minutes?
- 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 workThe community of San Antonio is located in the Caranavi Province, Bolivia. According to the 2005 year survey, there are 420 habitants of the community. The population is estimated to increase to 940 by the year 2035. The average peak flow is currently 1.2 L/sec and is expected to increase to 2.14 L/sec by 2035. The organic load is estimated to be 45 gram BOD5/capita-day. The community is considering a free surface wetland to treat their wastewater. (a) What is the BOD5 loading generated in the year 2035 (kg/day)? (b) Use the BOD loading to estimate the maximum surface area (ha) required for a free surface wetland that would serve the community in 2035 and remove BOD to 30 mg/L. (c) Assuming you are now considering sizing a facultative lagoon instead of a free surface wetland. Quickly estimate the required surface area (m2) for a facultative lagoon to handle a peak flow in 2035, assuming a design water depth of 4 m and a hydraulic detention time of 20 days.A 8.5 ml of sample of wastewater is diluted to 300 ml with distilled water in standard biochemical oxygen demand bottle dissolved oxygen were initial 9.2 mg/l 3 days 8.7 mg/l and after 5 days 6.4 mg/l at 20 c determine the biochemical oxygen demand for three and five days of the wastewater then compute the ultimate BOD assume k=0.12/d
- A Semi-solid waste storage has a volume of 1145 m3. The basin is initially 71% empty. The semi-solid density is 1521 kg/m3 is taken away from the storage tank at a rate of 5211.81 kg/day. How long will the basin take to be 91% emptied? Assume the storage is now initially full 23% and re-estimate the time to empty itA 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-1The average design flow at a wastewater treatment plant facility is 1.5 m3/s. The bar rack is mechanically cleaned with an average clear spacing of 2.5 cm. Estimate the average quantity of screenings that will be collected at each day.