The water supply to a mobile park contains 0.024 ug/L of PCB. Calculate the chronic daily intake (CDI) of PCB (mg/(kg*d)) of an adult resident of the mobile park who weighs 85 kg and consumes 2.3 L of water per day.
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- Coming home after the end of the winter semester, you find that your family’s swimming pool has not be maintained well. In particular, it has no chlorine residual at all, and it is full of tree leaves. You buy a concentrated chlorine solution (1% as Cl2) and begin to meter it into the pool at a rate of 100 mL/hour. The pool has a volume of 200 m3. You also add new water, and remove in-pool water, at a rate of 3.785 L/minute. The chlorine reacts with the organic matter in the with a rate of 0.5/hour. How long will it take to get the Cl2 residual up to 1 mg/L if you add Cl2 continously.20 MLD of water is flowing through a 3.0 km Long pipe of diameter 50 cm. The quantity of chlorine used to treat the water is 4.5 mg/l is applied at the entry of this pipe so that disinfected water is obtained at the exit of the pipe. The flow-through pipe is supposed to be increased by 6 MLD. The minimum amount of chlorine (in kg per day) required to be applied to achieve the same degree of disinfection assuming the dilution coefficient 1 isA wastewater treatment plant must disinfect its effluent before discharging the wastewater to a nearby stream. The wastewater contains 5.5 x 10^5 fecal coliform – forming units (CFU) per liter. The maximum permissible fecal coliform concentration that may be discharged is 3000 fecal coliform CFU/L. It is proposed that a pipe carrying the wastewater be used for the disinfection process. Determine the length of pipe required if the linear velocity of the wastewater pipe is 0.85 m/s. Assume that the pipe behaves as a steady-state plug flow system and that the reaction rate constant for the destruction of the fecal coliform is 0.22 per min.
- In a residential area of 20,000 inhabitants, the specific water demand is estimated at 50 l/c/d (leakage included). During a football game shown on the local TV station, the water meter in the area registered the maximum flow of 24 l/s, which was 80% above the regular use for that period of the day. What was the instantaneous peak factor in that case? What would be the regular peak factor on a day without a televised football broadcast?Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Determine the 95% confidence interval for the true mean DO concentration.
- Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 a. Local environmental regulations prescribe a minimum DO concentration of 2.0 mg/L. Perform a hypothesis test to determine whether the river’s water quality satisfies local regulations at a 5% significance level. (follow the 8step hypothesis test)b. Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.c. Determine the 95% confidence interval for the true mean DO concentration.A town with a sewer population of 4,000 has a daily wastewater flow, including industrial wastewaters of 1,600 m³ and an average BOD of 280 mg per liter. The industrial discharges to the municipal sewers are 60 m³ at 1,800 mg per liter BOD from a meat processing plant and 100 m³ at 400 mg per liter BOD from a soap canning plant. Determine the contribution of domestic flow in liters per person and the BOD in grams per person based on the town's wastewater, excluding the industrial wastewater.Answer and show complete solution. Pls don't rejectA factory discharges waste water to a nearby river. The concentration of dissolved oxygen (DO) a few meters downstream of the factory’s discharge point was recorded for 10 consecutive days as shown in the table below. The lower the DO, the more “polluted” the river is and as the DO reaches zero, the river becomes unable to sustain marine life. Day DO (milligram/liter) 1 1.8 2 2 3 2.1 4 1.7 5 1.2 6 2.3 7 2.5 8 2.9 9 1.9 10 2.2 Assume that the daily DO concentration is normally distributed. Estimate the values of the parameters μ and σ.
- A water source has a flow of 10 MGD, alkalinity of 275 mg/L in CaCO3, and a pH of 8.85. What will the alkalinity be after addition of 150 mg/L NaOH? Present your answer in mg/L as CaCO3. Assume a close system.ENVIRONMENTAL ENGINEERING-WATER POLLUTION: Incoming wastewater, with BOD5 equal to 200mg/L, is treated in a well-run secondary treatment plant that removes 90% of the BOD. You are to run a five-day BOD test with a standard 300mL bottle, using a mixture of treated sewage and dilution water (no seed). Assume the initial DO is 9.2 mg/L. FIND: Roughly what maximum volume of treated wastewater should be put into the bottle in you want to have at least 2.0 mg/L of DO at the end of the test (filling the rest of the bottle with water)? If you make a mixture of half water and half treated wastewater, what DO would you expect after five day?1.Determine how much water is required to dilute 20 liters of a solution that is 15% dye so that a 5% dye solution is obtained. 2. 2. A pipe can fill a swimming pool in 15 hrs. If a second pipe is open, the two pipes together can fill the pool in 5 hrs. How long would it take the second pipe alone to fill the pool?