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You are designing a reactor that uses chlorine in a PFR or CMFR to destroy pathogens in water. A minimum contact time of 30 min is required to reduce the pathogen concentration from 100 pathogens/L to below 1 pathogen/L through a first- order decay process. You plan on treating water at a rate of 1,000 gal/min.
(a) What is the first-order decay rate constant?
(b) What is the minimum size (in gallons) of the reactor required for a plug flow reactor?
(c) What size (in gallons) of CMFR would be required to reach the same outlet concentration?
(d) Which type of reactor would you select if your treat- ment objective stated that "no discharge can ever be greater than 1 pathogen/L"?
a prismatic bar AB of length L, cross section A, modulus of elasticity E, and weight W hangs vertical under its own weight. if the bar is a riser pipe hanging from a drill rig at sea, what is the total elongation of the pipe
Oil of a specific gravity of 0.75 is flowing through a 6-in pipe under a pressure of 15 psi. If the total energy relative to the datumplate is 8.0 ft below the center of the pipe is 58.6 ft, determine the flow rate of the oil.
If A and B are both made of wood and are 3/8 in thick, determine to the nearest ¼ in the smallest dimension h of the support so that the average shear stress does not exceed \tauallow = 300 psi.
The condenser in a refrigerator receives R-134a at 700 kPa and 50C, and it exits as saturated liquid at 25 C, The flow rate is 0.1 kg/s,and the condenser has air in at an ambient temperature of 15 C and leaving at 35 C. Find the minimum flow rate ..
develop the relation between bulk unit weight, specific gravity, void ratio and weight of water.
A cylindrical tank having a diameter d=2.5 inches is sunjected to internal gas presuure p=600 psi and an external tensile load T=1000 lbs. Determine the minimum thickness t of the wall of the tank
an engineer uses a standard technique for measuring the thickness of a clay landfill liner that has a typical standard deviation of 0.7 in. The project specifications require the liner thickness to be 36 inches or more, at least 95 percent of the ..
Determine the rate at which heat is added in the boiler, the power required to operate the pumps, the net power produced by the cycle, and the thermal efficiency.
Wastewater flow is 80 gpcd with 170 mg/l BOD and 190 mg/l suspended solids. Size the extended aeration basin and clarifier using the minimum detention time and overflow rates. Calculate the average F/M using an MLSS of 1000 mg/l.
Consider a cold worked C11000 copper alloy rod 21 mm in diameter and 250 mm in length. Calculate (a) the maximum tensile load, in N, and (b) the maximum length, in mm, to which the rod may be stretched without plastic deformation.
for a uniformly loaded square area, what is the stress to load ratio at a depth of 2B below the CENTER of the loaded area
The pollutant has a reaction rate coeeficient k of 0.25/day. Assuming is pollutant is well mixed in the lake, find the steady-state concentration of pollutant in the lake.
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