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A municipal drinking water treatment plant discovers that it has an unacceptably high level of the pesticide carbofuran and must develop a treatment technique to reduce the concentration to satisfy the relevant water quality standard. The treatment method of choice is sorption on activated carbon. Your firm gets the design job and you are assigned to do the preliminary calculations. Research has revealed that the sorption of carbofuran onto activated carbon from water follows this isotherm:
qe=266 ( Ce) ^0.41
where Ce (mg/L) is the equilibrium concentration of the species in water and qe(mg/g) is the mass of sorbed carbofuran per mass of activated carbon. The carbofuran concentration in untreated water is 0.9 mg/L. The drinking water standard is 0.04 mg/L. You must design to treat a steady water flow rate of 0.32 m^3/s. One possible approach is to mix powdered activated carbon (PAC) with the water, wait for equilibrium to be attained, then remove the PAC. At what rate must PAC be added (g/s) to meet the proposed standard?
The total number of effective exposures per unit of advertising medium depends on the region reached. In Louisiana, the number of effective exposures is 70,000, 100,000 and 75,000 for television, radio and direct mail, respectively.
Clouds can weigh thousands of pounds due to their liquid water content. Often this content is measured g/m^3. Assume that a cumulus cloud occupies a volume of one cubic km, and its liquid water content is 0.2g/m^3.
an apple weighs 60g and has a volume of 75cm^3 in a refrigerator at 8 degrees C. What is the apple's density List three intensive and two extensive properties of the apple.
Why is it not possible to obtain the modulus of elasticity in transverse bending by the same method used in a tension test Is there any relationship between the carbon content of these specimens and the four items in the object
In a curved prestressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment?
Two piezometers are located 1000 ft apart with the bottom located at depths of 50 ft and 350 ft, respectively, in a 400-ft-thick unconfined aquifer. The depth to the water table is 50 ft in the deeper piezometer and 40 ft in the shallow one.
A lake has a volume of 750,000 m3 (dimensions 15 m deep, 100 m wide, and 500 m long) and behaves as two completly mixed cells. Cell 1 makes up 40% of the lake ( dimensions 15 m deep, 100 m wide, and 200 m long) cell 2 makes up 60% of the lake (dimens..
The total saturated thickness of the aquifer is 15 m. Predict the concentration distribution along the water table after 5110 days, assuming a linear groundwater velocity of 1.6x10-3; dispersivities in x, y, and z of 5.0 m, 0.5 m, and 0.1 m
The station of a PI of a horizental curve is 60+20. The horizental curve has a degree of 4 and a length of 400ft. the othere given design perameters include. Superelevation runoff rate is 1/400. width of the pavement is is 15ft.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
a cylindrical specimen of a brass alloy 10.0 mm 0.39 in. in diameter and 120.0 mm 4.72 in. long is pulled in tension
A 4-cm- diameter rod of aluminum 7075-T6 is to subjected to an axial tensile force such that the factor of safety based on the yield stress on 1.75. Find the maximum allowable tensile force.
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