QuestionMay 17, 2025

How much time does it take to pump a lift station from a depth of 11 feet to a depth of 4.5 feet when the lift station has a diameter of 6 feet and pumps 150 gallons per minute? )6 minutes (B) 9 minutes@ C) 15 minutes 1.5 hours 7 If foaming occurs in an aerobic digester, what is the first check the operator should perform? A)Air rate and residual D.O B) Digester loading test C) Initial D.O,and digesterinfluent CBODS D. An analysis for detergents (8) When operating an advanced treatment facility using chemical treatment for solids removal, you discover high flows entering the system.YOU should. A)watch for toxic conditions in the biological treatment process produced by chemical under-dosing B)plan on reducing the sludge removal system from the clarifier. C)Inspect the chemical feeders to determine the chemicals being added do not cause a great increased/'decrease in PH D.)prepare to feed a higher dosage of chemicals. (9) All sulfide will be present in the form of gaseous hydrogen sullide when the ph of the wastewater falls below (A))5.0 (@) B) 6.0 897.0

How much time does it take to pump a lift station from a depth of 11 feet to a depth of 4.5 feet when the lift station has a diameter of 6 feet and pumps 150 gallons per minute? )6 minutes (B) 9 minutes@ C) 15 minutes 1.5 hours 7 If foaming occurs in an aerobic digester, what is the first check the operator should perform? A)Air rate and residual D.O B) Digester loading test C) Initial D.O,and digesterinfluent CBODS D. An analysis for detergents (8) When operating an advanced treatment facility using chemical treatment for solids removal, you discover high flows entering the system.YOU should. A)watch for toxic conditions in the biological treatment process produced by chemical under-dosing B)plan on reducing the sludge removal system from the clarifier. C)Inspect the chemical feeders to determine the chemicals being added do not cause a great increased/'decrease in PH D.)prepare to feed a higher dosage of chemicals. (9) All sulfide will be present in the form of gaseous hydrogen sullide when the ph of the wastewater falls below (A))5.0 (@) B) 6.0 897.0
How much time does it take to pump a lift station from a depth of 11 feet to a depth of 4.5 feet when the lift station has a diameter of 6 feet and pumps 150 gallons per minute? )6 minutes (B) 9 minutes@ C) 15 minutes 1.5 hours 7 If foaming occurs in an aerobic digester, what is the first check the operator should perform? A)Air rate and residual D.O B) Digester loading test C) Initial D.O,and digesterinfluent CBODS D. An analysis for detergents (8) When operating an advanced treatment facility using chemical treatment for solids removal, you discover high flows entering the system.YOU should. A)watch for toxic conditions in the biological treatment process produced by chemical under-dosing B)plan on reducing the sludge removal system from the clarifier. C)Inspect the chemical feeders to determine the chemicals being added do not cause a great increased/'decrease in PH D.)prepare to feed a higher dosage of chemicals. (9) All sulfide will be present in the form of gaseous hydrogen sullide when the ph of the wastewater falls below (A))5.0 (@) B) 6.0 897.0

Solution
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Answer

9 minutes Explanation 1. Calculate the volume of water to be pumped The lift station is a cylinder. Volume V = \pi r^2 h. Diameter = 6 ft, so radius r = 3 ft. Depth change h = 11 - 4.5 = 6.5 ft. Thus, V = \pi (3)^2 (6.5) cubic feet. 2. Convert cubic feet to gallons 1 cubic foot = 7.48 gallons. Total gallons = V \times 7.48. 3. Calculate time to pump Pump rate = 150 gallons/minute. Time t = \frac{\text{Total gallons}}{150} minutes.

Explanation

1. Calculate the volume of water to be pumped<br /> The lift station is a cylinder. Volume $V = \pi r^2 h$. Diameter = 6 ft, so radius $r = 3$ ft. Depth change $h = 11 - 4.5 = 6.5$ ft. Thus, $V = \pi (3)^2 (6.5)$ cubic feet.<br /><br />2. Convert cubic feet to gallons<br /> 1 cubic foot = 7.48 gallons. Total gallons = $V \times 7.48$.<br /><br />3. Calculate time to pump<br /> Pump rate = 150 gallons/minute. Time $t = \frac{\text{Total gallons}}{150}$ minutes.
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