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Develop an estimate of the volumetric flow rate of air that will be required for aeration of the mixed liquor in an activated sludge system.For this calculation, assume that the (ultimate) CBOD is 200 mg/L and (ultimate) NBOD is 50 mg/L. For purposes of this problem, assume that these two sources of oxygen demand are completely satisfied in the activated sludge system (i.e., assume that all CBOD and NBOD are completely "consumed" by the aerobic bacteria in the aeration basins). Assume an oxygen (O2) transfer efficiency of 25% from the aeration system in the aeration basins. Based on these characteristics, what volume of air will we need to pump through our aeration basins each day to satisfy this oxygen demand?
The total flow then moves to a point W on the traction drive two metres off the ground, and travels through a nine millimetre diameter conduit. Ignoring all friction and minor losses, determine the pressures at points H and W.
A differential leveling loop started and closed on BM Juno, elevation 5194.02 ft. The BS and FS distancces were kept approximately equal. Readings (in ft) listed in the order takken are 9.65, 2.11, 2.51, 8.35, 2.06, 9.25, 7.93, 2.83, 5.05, and 4.6..
a bearing wall carries a dead load of 120kn/m and live load of 100 kn/m. It is to be supported on a 400mm deep continuous footing underlain by a medium sand (unit weight = 19.2 kn/m3, phi= 37 deg, effective c = 0).
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
A non-reactive chloride solution is continuously discharged into an aquifer. The concentration at the discharge location is 800 mg/L. Determine the maximum concentration of chlorides to be observed at an observation well 30 m downstream of the disc..
Suppose that the distance from the lake outlet to the withdrawal cannot be more than 20 mi. What should be the new volume of the lake?
A spillway carries a discharge of 22.5 m^3/sec with the outlet velocity of 15 m/sec at a depth of 0.2m. Select an adequate USBR stilling basin and determine the sequent depth, the length of the hydraulic jump and energy loss.
Describe in your own words the three strengthening mechanisms i.e., grain size reduction, solid solution strengthening, and strain hardening. Be sure to explain how dislocations are involved in each of the strengthening techniques.
calculate the numbers of married men, single men, married women and single women. Print these numbers on a student summary report. If any single men are over 30 years of age, print their names and ages on a separate eligible bachelors report.
A horizontal curve on a single-lane highway has its PC at station 124 + 10 and its PI at station 131 + 40. The curve has a superelvation of 0.06 ft/ft and is designed for 70 mi/h. What is the station of the PT?
A corporation issues a new 10 year bond that has a coupon rate of 4.65% with quarterly dividend payments. Alex purchases 200 of these bonds at a price of $98.75, for a total investment of $19,750. Assuming he holds them to maturity, what will be..
The car was travelling on a 3% upgrade on a pavement with friction factor of 0.30. How much further would the car have skid if it did not strike the concrete barrier?
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