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- When drinking water is disinfected with chlorine an undesired byproduct, chloroform, is formed. Suppose a 70-kg person drinks 2 L of water every day for 70 years with a chloroform concentration of 0.1 mg/L What is the average life-time daily dose? 0.17 ug/kg•day 2.9 ug/kg•day 0.1 mg/L 0.2 mg/L•day1 A woman works in a factory for 15 years. The drinking water in the factory contains xylene and fluoride. Her only exposure to these chemicals in water is at work. Using Table 10,find the hazard index associated with this exposure?Xylene: 0.6 mg/LFluoride: 3.1 mg/LAssume an adult male who weighs 50 kg drinks 2L of water every day and the absorption factor the chemical of concern is 75 percent (so 25 percent of the chemical secreted). The concentration of the chemical in the drinking water is 55 ppb? Determine the does in mg/kg-day.
- Environmental Engineering A liter of water was found to contain 10mg of benzene (C6H6). What is the concentration of benzene in mg/L, ppm, and molarity?A water treatment plant with an average flow of Q = 0.8 m3/s treats its water with alum at a dose of 27 mg/L. Alum (Al2(SO4)3. 14.3 H2O) coagulation is used to remove particulate matter, reduce the concentration of organic matter, and reduce the alkalinity of the water. Determine the total mass of aluminum hydroxide (Al(OH)3) consumed per day (kg/d, no decimal point) (atomic mass: Al: 27, S: 32, H: 1, O: 16).Choose the correct answer 200 g CO2 approximately takes up ____ L volume in air at 1 atm and 0oC? 4480; 100; C. 200; D. Undetermined Which of the following gases has the greatest contribution to the greenhouse effect on the Earth? A. Water vapor; B. CO2; C. CH4; D. O3 Based on what you have learned, which of the following can contribute(s) greenhouse gases? A. landfills; B. a deep lake with organic rich sediments; C. septic tanks; D. all of the above Which of the following gases is NOT a greenhouse gas? A. methane; B. carbon monoxide; C. hydrofluorocarbons; D. water vapor
- A water treatment plant with an average flow of Q = 0.5 m3/s treats its water with alum at a dose of 34 mg/L. Alum (Al2(SO4)3. 14.3 H2O)coagulation is used to remove particulate matter, reduce the concentration of organic matter, and reduce the alkalinity of the water. Determine the total mass of alkalinity (HCO3-) consumed per day (kg/d, no decimal point) (atomic mass: Al: 27, S: 32, H: 1, O: 16, C: 12)If the alum dose required to coagulate is 10 ppm, find out the amount of alum (in quintals) needed to treat 10 MLD of water.Determine the individual Hazard Quotients and the overall Hazard Index associated with a 70 kg adult eating 15 g fish every day that contains 9.8 μg/ kg of Arochlor 1254 and 1 mg/kg of Methylmercury? Arochlor 1254 can exhibit noncarcinogenic effects in humans. Methylmercury has been shown to cause developmental neuropsychological impairment in human beings. The RfD for methylmercury is 1x10-4 mg/kg-day and the RfD for Arochlor 1254 is 2 x 10-5. Also, comment on the risk involved, based on the individual Hazard Quotients.
- 4. Calculate the risk for a compound with toxicity dose of 10 ug/L, unit risk (RU) of 3.2 x 10-5 L/mg for a person exposed to it for 15 years with an total expected life 87 years.A family consists of an adult male weighing 70 kg, an adult female weighing 50 kg, and a child weighing 15 kg. The air they breathe contains 1 µg/m3 of a listed carcinogenic chemical, and the waste they drink contains 1 µg/L of the same chemical. Assume the air intake for adult and child is 20 m3 /day and water intake for adult and child is 2 L/day. The body retains 80% of the air pollutant and 100% of the water pollutant. Estimate the total chemical dose per kg of body weight for each family member per day correctly.Your organization has been hired to provide a water treatment process or device toremove toxic Chromium 6 [Cr(VI)] from water emanating from an underground source.Your organization has developed a treatment process that removes most of the Cr(VI)from the water to a residual concentration of 0.05 mg/L which is an acceptable level inline with the World Health Organisation. The underground water flows at 40 m3/h andhas Cr(VI) concentration of 100mg/L. The effluent flow rate is 97% of the influent flowrate, and the remainder of the water is discharged as wastewater. Calculate theconcentration of Cr(VI) in wastewater.