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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?
A company that manufactures regenerative thermal oxidizers made an investment 10 years ago that is now worth $1,300,000.
How to determine maximum positive and maximum negative factored design moments at a certain point
if shaft A have 1200N.m torque with 25cm diameter and the shaft B have diameter of 52cm what is the torque of shaft be
The column is constructed from high-strength concrete and four A-36 steel reinforcing rods. If it is subjected to an axial force of 37.5 kN , determine the required diameter of each rod so that one-fourth of the load is carried by the concrete
A compressible clay layer 10.0m thick has an initial void ratio in situ of 1.026. Tests and computations show that the final void ratio of the clay layer after construction of a structure is 0.978. Determine the estimated primary consolidation set..
The distance between the piston and the cylinder is .0011 inch. If the piston decelerates at 1.85 ft/s^2, when the speed is 19.5 ft/s. What is the viscosity of the oil. cylinder is 6 in high and 5 in long.
The current removal efficiency is 96% for an air flow rate through the separator equal to 18 m3/s. Due to a process change, the air flow rate is expected to increase to 22 m3/s.
Estimate the average hourly, average daily, and minimum hourly residential sewage flows from an area serving a population of 1500 people. Assume that the lenghth of sewer and house drains equals 3.0 km and that infiltration occurs
A simple horizontal curve of radius 750 ft connects two tangents that intersect at an angle of 66º30'. Compute the parts of the curve, including T, L, LC, E, M, and D.
The state highway department is considering six routes for a new highway. Listed below are the estimated construction costs, maintenance costs, and the user cost associated with each route.
If the allowable shear stress is 15ksi, determine the diameter of a solid shaft if it is to transmit 50hp at a frequency of (a) 900rpm, (b) 1800rpm
A rectangular channel is to carry 200 cfs. The mean velocity must be greater than 2.5 fps. The channel bottom width should be about twice the channel depth. Find the channel cross section and the required channel slope.
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