1. A rectangular clarifier is 75 feet long, 22 feet wide, and 10 feet deep. If it receives a flow of 1,250,000 gallons per day, what is the detention time in hours? 2. A rectangular secondary clarifier is 60 feet long, 30 feet wide and 8 feet deep. If the flow into the clarifier is…
1. The depth of a waste treatment pond should be less than three feet. a. true b. false 2. When ponds are operated in series, the influent is split and a portion is diverted to each of the two ponds. a. true b. false 3. A waste treatment pond is a biological process. a. true…
1. Your living room measures 25 ft by 15 feet. How many square yards of carpet do you need to cover the floor? If carpet (including installation) is $35 per square yards, how much will it cost? 2. How many feet of snow fence does it take to enclose an excavation 20 ft in diameter…
1. Which of the following is not a probable cause for excessive sloughing in a rotating biological contactor? a. Toxic material in the influent b. Excessive pH changes c. Excessive changes in flow and/or organic loading d. High dissolved oxygen levels 2. Which of the following is the device used for level measurement? a. Parshall…
1. Calculate the length of one side of a rectangle, in feet that has a perimeter of 280 ft and a width of 20 ft. 2. Calculate the diameter of the circle, in feet with a 94.2 ft circumference. 3. Calculate the diameter of a circle, in feet, with an area of 19.625 sqft. 4….
1. Your final effluent flow is 5 mgd and you are feeding 100 lbs per day of disinfection, what is the chlorine residual in mg/L? a. 4.2 mg/L b. 2.4 mg/L c. 5.9 mg/L d. 7.1 mg/L 2. Unit processes used for sludge dewatering include the following except _. a. Centrifugation b. Dissolved air floatation…
1. Operators need to take special precautions against high _ levels when working near blowers. a. Dust b. Odor c. Noise d. Oil and grease 2. A composite sample provides _. a. Representative information for given flow or time intervals b. Information on a waste stream’s DO profile c. Information on a mixture of different…
1. Find the volume, in gallons, of a tank that has a diameter of 27.4 feet and a depth of 11 feet. 2. Find the volume, in gallons, of a tank – diameter of 120 inches and a depth of 180 inches. 3. Find the volume, in gallons, of a tank with a side length…
1. Find the area, in square feet, of a circle with a 30 inch diameter. 2. Find the area, in square feet, of a circle with a diameter of 30 feet. 3. Find the area, in square feet, of a circle with a diameter of 36 inches. 4. Find the area, in square feet, of…
1. Find the circumference, in feet of a circle with a diameter of 30 inches. 2. Find the circumference, in inches, of a circle with a diameter of 30 feet. 3. Find the circumference, in feet, of a circle with a diameter of 22.3 inches. 4. Find the perimeter, in feet, of a rectangle that…
