Determine what is the concentration of pce in the lake

Assignment Help Civil Engineering
Reference no: EM13297508

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

Questions Cloud

 Determine the number of moles of water : Find the number of moles of water that can be formed if you have 158 mol of hydrogen gas and 74 mol of oxygen gas. Express your answer with the appropriate units. What is the benzene concentration at the dwtpat steady state : An industry is illegally dischargingbenzeneinto a river. The concentration in the river atthe point of discharge is 0.2mg/L. A drinking water treatment plant (DWTP) is located 1.5km downstream. The watervelocity in the riveris 0.35km/day. Explain the initial disappearance of silver nitrate in water : The initial disappearance of silver nitrate in water indicates a chemical reaction occurred The color change of the solution indicates a chemical reaction occurred A chemical reaction occurred when silver nitrate was added to water A chemical reac.. Find the final temperature of the gas in the cylinder : Two cylinders each contain 0.30 mol of a diatomic gas at 300 K and a pressure of 3.0 atm. What is the final temperature of the gas in the cylinder A Determine what is the concentration of pce in the lake : 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. How much work does she do on the dog : To keep her dog from running away while she talks to a friend, Susan pulls gently on the dog's leash with a constant force given by F = (2.1 N ) ^x+ (1.5 N )^y, How much work does she do on the dog Define the chemical reaction between solid ammonium chloride : The energy diagram shown represents the chemical reaction between solid ammonium chloride and solid barium hydroxide octahydrate: 2NH4Cl(s)+Ba(OH)2 * 8H2O(s)-----2NH3(aq)+BaCl2(aq)+10H2O(l) What is present worth of five years of cost of maintanance : you purchased an old machine at the beginning of this year.maintanance on this old machine will be 100\$ at the end of this year but is expected to increase by \$25 each year after. what is the present worth of five years of the cost of maintanance Explain what is the gibbs free energy for this reaction : What is the Gibbs free energy for this reaction at 5546 ? Assume that and do not change with temperature. At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium

Write a Review

Concrete dam retaining water

A concrete dam retaining water has a specific weight of concrete of 23.5kn/m3, what is the factor of safety against sliding & overturning and pressure intensity on the base if coefficient of friction is 0.45

Magnitude of shaft work obtained from the turbine

If the amount of heat transfer in the HE unit is 2460 kJ per kg of steam, what is the magnitude of shaft work obtained from the turbine in kW?

Formulate a linear program for blend mix

Formulate a Linear Program for Blend Mix at Bluegrass Distillery, The Bluegrass Distillery produces custom-blended whiskey

Formulate and solve the minimum weight design

consider the cantilever beam-mass system. formulate and solve the minimum weight design.

Superelevation rate for a roadway

What superelevation rate would you recommend for a roadway with a design speed of 100 km/hr and a radius of curvature of 500 m? Assume f = 0.11.

What type of contract would you want and why

If you were asked to perform an excavation contract competitively with limited data, what type of contract would you want and why?

Dimensions of an acceptable box of a largest area

A delivery company accepts only rectangular boxes the sum of whose length and girth (perimeter of a cross section) are equal to 108cm. Find the dimensions of an acceptable box of a largest area.

Replace the two couples with a single equivalent couple

The two shafts in a speed-reducer unit are subjected to couples of magnitude M1 = 18 N · m and M2 = 7.5 N · m, respectively. Replace the two couples with a single equivalent couple, specifying its magnitude and the direction of its axis.

Find the average time in system

If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.

Determining specific gravity

The cross sectional dimensions of a 4-ft-long wood member at 30% moisture content is 1.5 in. x 7.5 in., and its weight is 11 lb. At oven-dry condition, its dimensions and weight are 1.35 in x 6.8 in., and 10.2, respectively. What is its specific g..

Vehicle delay due to queuing

Vehicles begin to arrive at a toll booth at 850 am with an arrival rate of x(t) = 4.1 + .01t (with t in min and x(t) in veh /min.) The toll booth opens at 9am and processes vehicles at a rate of 12 per minute throughout the day. Assuming D/D/1 que..

Determine the tangential component of the acceleration

determine the tangential component of the acceleration of the sled a) just before it reaches B, b) just after it passes C.

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd