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Disinfection by ozone follows first-order kinetics, with a rate constant of 1.2/minute. The town of Obfisquitory wishes to use 4 equal volumes of CFSTR's in series to disinfect 2 million gallons per day (mgd) of water containing 1000 coliforms/L to the maximum required concentration (MCL) of 1 coliform/L.
a) Determine the volume of each CFSTR
b) If a two CFSTR, with a volume equal to the sum of the four in series, is used for disinfection, what will the final coliform concentration be?
A 200ft length of steel wire is to carry a tensile load of 340lb. Find the minimum acceptable wire diameter if the maximum allowable stress in the wire is 30ksi, and the lengh of the wire must not increase by more than 2 inches when there is no ch..
If the elevation difference between the water surfaces is y = 25 + x/11 metres, what minimum pipeline diameter will be required to convey the design discharge? Once your design is complete, determine the actual discharge. The value of x equals 23.
Estimate the critical pressure of a mixture of methane and n-hexane if the critical temperature of the mixture is known to be 200 F. Compare your answer with the critical pressures of pure methane and pure n-hexane.
a tower is surrounded by a wall that is 10 m high and 30 m away from the base of the tower. compute the length of the shortest ladder that can stand outside the wall and lean against the tower.
The venturi meter is in a 60 cm pipe. What deflection will occur on a mercury-water manometer connected between the upstream and throat section if the discharge is .57 m^3/s. Assume T = 20 C
An 800 ft ship has a displacement of 35,000 tons, and the area defined by the waterline is 38,000 ft^2. Will the ship take more or less draft when streaming from salt water to fresh water? How much will it settle or rise?
For a given load increment, the time for 50% consolidation was 5 min 20 sec. How long will it take for 50 % consolidation of a similar clay layer in the field that is 8.2 ft thick & drained on one side only
HOCL is added to water in a tank as a disinfectant. after equilibrium is reached it is found that the pH of the water in the tank is 8.2 and the gas phase partial pressure is the head space of the tank is 0.2E-7 atm. (not: henry's law constant for..
calculate maximum external pull in each gear of a tractor when given speed, slope, weight, and rolling resistance
A column has a mean capacity of 950 kip. The standard deviation for the column capacity is 50 kip. The average load is 700 kip with a standard deviation of 75 kip. What is the probability of failure, pf
To avoid shrinkage cracks in the grout, what should be the total expansion and total bleeding in term of percentage for the grout?
While the swing bridge is closing with a constant rotation of 0.5 rad/s, a man runs along the roadway such that when d = 10 ft he is running outward from the center at 5ft/s with an acceleration of 2 ft/s^2, both measured relative to the roadway.
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