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- 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?The 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.Solve Q 1.(a, b) a. Calculate 1-day BOD and ultimate BOD for a wastewater whose 5- day 20 °C BOD is 737. The reaction constant K= 0.23d -1. Also calculate 3-day BOD at 27°C? b. Calculate μ as a function of μmax for the domestic sewage considering S= 737 mg/l and Ks = 07 mg/l.
- Determine ultimate BOD for a wastewater having 5 day BOD at 20o C as 160 mg/L. Assume reaction rate constant as 0.2 per day (base 10).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 theseA 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 work
- Consider 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?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?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.
- Please calculate the theoretical OD, 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.Determine the characteristics of a unit composed of 2 desilting channels treating a peak wastewater flow of 1500 L7s. A surface load of 40 m/h is assumed. The effective head or depth "P" is set at 1.5 m. Calculate: 1. Area of each channel 2. 2. Effective volume of each desanding channel 3. HRT 4. Cross-sectional area of each desanding channel 5. 5. Width of each channel.A circular shaped clarifier is used to treat waste water at a rate of 5000 m3/day. Determine the diameter of the clarifier if the overflow rate of the clarifier is 35 m3/m2/day.