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- Determine how much extra volume is needed to treat the following wastewater in a CSTR than in a plug flow reactor. • Influent TOC: 273 mg/L • Required Effluent TOC: 57.0 mg/L • Flow: 792,500 gallons/day • First Order Microbiological Rate Coefficient (k’): 5.98/day Answer: 295,000 gallons 2. Discuss in detail at least two ways the k’ value may have been obtained and which technique is probably more accurate?A 15-mL sample of sewage is mixed with enough dilution water to fill a 300 mL BOD bottle. The bottle has an initial DO of 8.5 mg/L. At the end of 5 days, meausured DO is 2.8 mg/L. Calculate BOD5 of the sewage.A community normally levies a sewer charge of 20 cents/m3 ($0.20/m3). For discharges in which the BOD > 250 mg/L and suspended solids (SS) > 300 mg/L, an additional $0.50/kg BOD and $1.00/kg SS are levied. A chicken processing plant uses 2000 m3 water per day and discharges wastewater with BOD = 480 mg/L and SS = 1530 mg/L. What is the plant’s daily wastewater disposal bill?
- A wastewater treatment operator uses the formula A=8.34FC to determine the amount A of chlorine in pounds to add to a basin. The flow F through the basin is in millions of gallons per day, and the desired concentration C of chlorine is in parts per million. If 1600 pounds of chlorine was added to a basin with a flow rate of 7.5 million gallons per day, what would be the resulting concentration?An industry is discharging 2500 m3/d wastewater into a sanitary sewer. The concentrations of BOD5, TSS, TN, and TP are 200, 280, 35 and 10 mg/L, respectively. Calculate the population equivalent of the industry based on flow, BOD5, TSS, TN, and TP (i.e., number of people served). Assume that the unit waste loadings in terms of g per capita per day are 95, 104, 18, and 4 for BOD5, TSS, TN (as N), TP (as P), respectively.A wastewater treatment plant serving a population of 50000 receives a per capita flow of 240 L/d and per capita BOD5 loading of 64.8 g/d. What is the BOD concentration of sewage entering the treatment plant?
- The BOD is the measure of what type of pollutant in water? Describe how to do a OBD on water sample. A sample of water that you took from a lake that you visited on vacation gave a BOD measurement of 6 mg/L. Is the lake polluted? If so, what type of pollutant is present?Environmental Engineering Five million gallons per day (MGD) of wastewater, with a concentration of 10.0 mg/L of a conservative pollutant, is released into a stream having an upstream flow of 10 MGD and a pollutant concentration of 3.0 mg/L. What is the concentration in ppm just downstream of the release point? How many pounds od substance per day pass a given spot downstream?A wastewater treatment plant receives 250 mg/L BOD, 45 mg/L NO3-N, and 0.08% TSS. What is the loading of each component (lb/d) if the plant flow is 730,000 gpd?
- in simple terms, explain how to use a lagoon and evapotranspiration in wastewater processing and disposal.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?Q1.Design a trickling filter for treating 5 million litres of sewage per day. The B.O.D. of sewage is 144 ppm. Q2.Determine the ultimate B.O.D. for a sewage having 5-day B.O.D. at 20°C as 200 p.p.m. Assume R20 = 0.1 per day. Q3. Given the following data, calculate the 5-day B.O.D. of the unseeded sample of sewage: Initial DO…………….. 10 mg/1 Final DO…………… 4 mg/1 Bottle volume ………….300 ml Sample volume………….6 ml.