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A drinking water system treats a flow of 3000 gallons per minute. Consider disinfection of a bacteria by ozone with an inactivation constant of K=0.06/min. To reduce the number of bacteria from 400 bact/ml to 4 bact/ml.
A) Calculate the volume of PFR to achieve disinfection
B) Calculate the volume of CMFR to achieve disinfection
Draw the shear diagram for the shaft. The bearings at and exert only vertical reactions on the shaft
Given that uniform flow is subcritcal and there is a constriction in a rectangular channel, how do you determine what the constricted width would be to force the flow to be critical. Draw this transition on a specific energy curve.
A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 10-4.
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.
A 2.50-g sample of a large biomolecule was dissolved in 13.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule.
An open test tube at 293 K is filled at the bottom with 12.1 cm of Hg and 5.6 cm of water is placed above the mercury. Calculate the pressure at the bottom of the test tube if the atmospheric pressure is 756 mm Hg.
A bridge has cylindrical piers 1 m in diameter and spaced 15 m apart. Downstream of the bridge where the flow disturbance from the piers is no longer present, the flow depth is 2.9 m and the mean velocity is 2.5 m/s.
Steam at 100 psia, sat vapor is in a pipe. The pipe is schedule 40 steel with a wall thickness of 1/8 inch and a length of 100 ft. The outside air temperature is 40 degrees Fahrenheit. The mass flow of steam is 4,000 lb/hr.
A fully loaded, ocean going container ship is just stable about its longitudinal axis (roll). The ship has a total weight of 155,000 tons, length = 1,600 feet and a beam = 150 feet (assume that it is the shape of a rectangular box). Calculate the ..
the boiling point of water decreases wiht elevation because of the pressure change. what is the boiling point of water at an elevation of 2000m and at an elevation 4000 m for standard atmospheric conditions
Two soil samples, each having a void ratio of 0.76 and density of 2.65 grains have degrees of saturation, respectively, 85% and 100%. Determine the overall specific weight of each of the samples.
The transportation agency would like to determine the maximum spacing of stations to allow trains to arrive no more than 5 minutes apart. 1. Draw a time-space diagram depicting the above scenario
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