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An industry discharges PCE (tetrachloroethene, tetratchloroethylene, or perchloroethylene) into a small, well-mixed lake. The influent concentration is 0.4mg/L and the hydraulic residence time of the lake is 5days.A. What is the concentration of PCE in the lake (at steady state) if PCE degradesin the lake with a first-order rateconstant k= 0.5d-1?B. A DWTP takes water from the lake. The oral RfD for PCE is 0.01 mg/kg-d (text,Table 4.11). Is the averagedaily dose from consuming 2 L/d of water from the DWTP greaterthan the RfD? Assume a 70 kg body weightand no removal in the DWTP.C. The bioconcentration factor for PCE is 31 L/kg (text, Table 4.12). Is theaverage daily dosefrom eating 60 gof fish per day caught from this lakegreater than the RfD? Assume a 70 kg body weight
What is the TCE concentration in ppm if the tank is held at (a) 4 degrees C and (b) 35 degrees C (c) What is the TCE concentration in ppm if the tank is filled with hexane instead of water
Two level sections of an east-west highway (G=0) are to be connected. Currently, the two sections of highway are separated by a 4000-ft (horizontal distance), 2% grade. The western most section of highway is the higher of the two and is at elevati..
Important information about Mechanical engineering dynamics, A 3000 lb car rests on a horizontal street out of gas with its brakes locked.
You have been asked to estimate the optimal size of a small reservoir that is being constructed near Atlanta. Knowing that water is a scarce commodity, you have decided to adopt an "economists" perspective on this problem
A condition where there are no net external forces acting upon a particle or rigid body and the body remains at rest. ... forces acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity.
Suppose you are a member of an EPA enforcement team investigating the possible dumping of arsenic into Arbor Lake. You take water samples from the middle of the lake and find that the concentration is 90.0 ppb.
ABC is a triangular tract of land. The 1.5 tract DEFG is to be subdivided. AE is 480ft and DC is 350 ft. Determine the lengths of DG and CB. (Note 1 acre= 43,560 f^2)
Axis of the hole is perpendicular to VP. Draw elevation, plan and development of the lateral surfaces of the pyramid.
Calculate the IEEE double precision floating number immediately greater than the minimum number in double precision in both binary and decimal form
Determine the maximum and minimum stress intensities in the section.
The inlet of loe pressure turbine is 500Kpa and 500°C. Condenser operates at 10 Kpa. Determine the mass flowrate through boiler needed to produce 5000KW of power.
A conical tube of length 8 m fixed vertically with its smaller end upwards. The velocity head and pressure head at upper ends are 1.27 m and 2.50 m respectively. The velocity head and pressure head at lower ends are 0.203 m and 5.407 m respectivel..
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