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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
Compute the maximum acceptable service load on an A36 steel plate tension member 1/4in.x12in. having a single line of holes parallel to the direction of loading. The load is 25% dead load and 75% live load, and 7/8in. diameter bolts are used.
A hawk flying at 2 m/s at an altitude of 45 m accidentally drops its prey. The parabolic trajectory of the falling prey is described by the equation below until it hits the ground, where y is its height above the ground and x is its horizontal dis..
Plot the magnitude of the force exerted on the gate by the brace as a function of the angle of the gate, , for . Assume the weight of the gate is negligible.
Determine the deflection of a simple uniformly loaded beam by the Ritz method,using first one term, then two terms, adn finally three terms in a sine series. Why does the coefficient of sin2piex/L vanish?
A lake with a surface area of 1050 acres was monitored over a period of time. During a one month period, the inflow was 33 cfs, the outflow was 27 cfs, and a 1.5 in seepage loss was measured.
A stockpile of gravel that has a water content of 6% is rained on so that its water content increases to 9%. Compute the difference in the weights of dry gravel in a 10 ton truckload taken from the pile before and after the rain.
Find the length and width of a square basin for virus disinfection of a flow of 6 MGD. You may assume a depth of 5 ft, a C•t product of 10 (mg/L) •min for 1.5-log removal, and a target free chlorine residual of 0.6 mg/L.
Design a logic circuit that, when enabled with an active-high signal named en, will detect four different ranges of values for a 5-bit input number.
The weights on the same axles when the truck is empty and leaving the power plant are 10 kips, 12 kips, and 8 kips, respectively. A two lane road is to be designed to serve the power plant and to last for a period of 10 years. a) What is the equiv..
The tape is stretched over three equal spans. Calculate the tape corrections under the following conditions at field, temperature = 85ºF, pull = 18kg, E= 2.109 x 10 6 kg/cm 2
Find the expanded depth of the bed after the backwash when initial depth of the bed is 3 ft using given conditions. μ = 0.01g/cm/sec, T = 25oC, ρs = 2.65, ρ=1, washrate = 1.5 cm/sec, ks2 = 196. (Assumed single size)
A beryllium copper wire having diameter of 1-50 mm and length of 40mm is used as a small torsion bar in an instrument. determine what angle of twist would result in the wire when it is stressed to 250 mpa.
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