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1.State the two main reason why an activated sludge system is operated at a relatively low f/m ration?
2.Define the f/m ratio in the context of biological treatment of wastewater, and relate the f/m ratio to the exponetial growth and declinign growth phases of a bacterial culture. Hoe does the f/m ratio influence the metabolism, the rate of BOD removal, and the settleability of sludge?
3.Suppose you are told that a process must achieve a 2.7 log removal of Giardia cysts. What does that mean in terms of % remaining and % removal?
An underground gasoline storage tank has leaked benzene into an unconfined aquifer over a period of several months. The aquifer characteristics are: Ambient temperature=8 oC Hydraulic conductivity = 123 ft/day Hydraulic gradient = 0.00091 ft/ft
a horizontal curve on a two-lane highway 12-ft lanes has pc at station 123 80 and pt at station 129 60. the central
At the beginning of compression the pressure is 14 psi and the temperature if 60°F. The temperature at the end of combustion heat addition is 1500°F and the compression ratio is 9. Use constant specific heats at room temperature
A turbine discharges water at 0.4 m3/s under a head of 10.50 m and with an overall efficiency of 80 %. determine what is The power developed.
A proposed square footing carrying a total load of 900 kips is to be constructed on a uniform thick deposit of cohesionless soil. The soil's unit weight is 135 pcf, and its angle of internal friction is 38 degrees
Find the depth and the top width of a v-notch capable of discharging a maximum of .7m^3/s and such that the head shall be 75mm for a discharge of 5.6 liters per second.
What are two or three quality management tools used in data collection? What types of quality management tools do you utilize to make personal or business decisions? How do you use these tools in the decision-making process?
What is the result of a volume change in a saturated cohesive soil because of expulsion of the water occupying the void spaces
write a computer program that generates a sequence of binomial random variables with parameters n=20 and p=0.3. a) use the inverse c.d.f approach
The house has a 1 m high dirt-floored crawl space. The emission rate of radon into the crawl space is reported to be 0.6 pCi/m2s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of..
A water main springs a leak and the geyser is estimated to be 20 feet in height. It is also estimated that about 300 gallons per minute is leaking based on flow into gutter. About how big is the hole in the water pipe
Suppose the utility encourages its customers to replace their 75-W incandescents with 18-W compact fluorescent lamps (CFL) that produce the same amount of light. Over the 10,000-hr lifetime of a single CFL,
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