Based on a 10-6 risk for a 70-kg individual consuming 2L of water per day, the DWEL for a contaminant is 10 μg/L. What potency would produce this value?
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Based on a 10-6 risk for a 70-kg individual consuming 2L of water per day, the DWEL for a contaminant is 10 μg/L. What potency would produce this value?
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- A company is currently discharging 200 L/min of 100 mg/L contaminant into a river. The river flowing past the company has an upstream flow rate of 3800 L/min with 0 mg/L of the target contaminant. The company must reduce its effluent concentration to below 20 mg/L (a) what is the current contaminant concentration past the point of discharge? (b) How much clean water would be needed to dilute the contaminant stream to 20 mg/L.? (c) What would be the contaminant concentration past the point of discharge if the company's contaminant stream was diluted with the water in part b?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.Drinking water from a dam which undergoes conventional treatment has a computed chlorine demand (due to silt, corrosion and bacteria) amounting to 3.5 ppm. Per PNSDW, such drinking water must have a mandatory chlorine residual of 1.0 ppm at source. If production flow is at 500 cu.m./day, calculate the chlorine dosage needed in pounds per day (PPD).
- The influent of a sewage treatment plant has a TSS concentration of 118 mg/L. What is theconcentration of suspended solids in the plant effluent if the plant is achieving 92 percent TSSremoval efficiency? If the flow rate is 12 mgd, how many pounds of solids are discharged perday into the receiving stream?If the chronic daily intake of benzene in a contaminated groundwater source is 0.002 mg/(kg*d) and the oral cancer slope factor is 0.029 (kg*d)/mg, calculate the expected number of increased cancer cases in a community of 545,617 people consuming the groundwater.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 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 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.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 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?15. Shown below is a set of effluent BOD data from a treatment plant. The plant's permit requires that the weekly average BOD be less than or equal to 20 mg/L with a 90% probability. State whether you think the plant is meeting the requirement and provide appropriate calculations to support your conclusion. Data: 19, 17, 13, 16, 22, 15, 20A basin with dimensions of 12 width 100 length and 12 deep depth of water has an intention of 750 galons per minute. If the flow contains 250 mg/l of a waste with a degradation rate of mi what the efficant concentration from the basinis modeled as a continuously mixed flow reactor (CMFRCSTRIP tome 50 mg ime 20 m