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22 Compare the CDI's (LADD's) of an adult female to a 10monthold child for exposure to hexavalent chromium from drinking water. The concentration of...


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These are really simple environmental engineering( Science) problems. 

Those questions are not hard and maybe finish it quick. 


However, i need to finish it in 4 hours


. 2­2 Compare the CDI’s (LADD’s) of an adult female to a 10­month­old child for exposure to hexavalent chromium from drinking water. The concentration of Cr(VI) is 0.01 mg/L and assume ED=AT=1 yr. (10 pts) . 2­3 An adult male receives all his water from a municipal supply that is contaminated with 0.003 mg/L of tetrachloroethylene (PCE). Assume he takes a 15­minute shower every day. The PCE concentration in the air is in equilibrium with the PCE in the water and thus can be determined from Henry’s law from the concentration in the water. PCE has a unitless Henry’s constant KH=1.4, which means Cair=Caq/KH. The dermal permeability constant

 

of PCE is 6.17×10­5 m/min. (10 pts) . a. Calculate his total annual (ED=AT=1 yr) LADD due to exposures of drinking the water and showering (dermal absorption + inhalation) with the water. b. Which of the three modes of exposure results in the highest delivered dose? 2­4 Calculate the incremental and total risk from PCE in problem 2­3. Be conservative in your selection of CSF. Use oral slope factor for dermal route of exposure. (10 pts) . 3­1 A cylindrical rapid mix tank has a diameter of 2 m and a flow rate of 20 m3/min. The water height is 2.5 m. 5 kW of mixing energy are imparted to the water (μ=10­3 kg∙s­1m­1). What are the detention time and velocity gradient

 

in the rapid mix basin? (10 pts) . 3­2 A treatment plant intends to treat 1.5 m3/s with 10 sedimentation basins. You have been asked to check the design of a colleague. Their design was to use 10 basins, each with L=36 m, W=12 m, H=3 m, weir length = 50 m. Verify the design satisfies the following criteria: OFR ≤ 30 m/d, θ > 2 hr, L:W 2:1 – 4:1, and WLR ≤ 300 m2/d. (10 pts) . 3­3 How many 10 m × 10 m filters are needed to treat a flow rate of 0.8 m3/s if the loading rate is limited to 5 m/hr? (10 pts) . 3­4 A water treatment plant has a disinfection contactor that is 10 m × 40 m × 3 m. The flow rate is 8 m3/min and the baffle factor is 0.7. If 3­log Giardia disinfection is required, what is the ratio of the CT that is achieved to the CT that is required when the temperature is 15°C, the pH is 8.0, and the chlorine concentration is 2 mg/L? (10 pts)

 


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