1. Methods for replacing sewer piping without using excavation are called __ replacement/technologies. a. Renovation b. Remote renovation c. Trenchless d. Chemical liner 2. Which of the following repair/rehabilitation methods does not require any excavation? a. Internal grouting b. Pipe bursting c. Microtunneling d. Auger boring 3. Which of the following pipe materials can be…
Solving Math Problems: Do not be tempted to look at a problem and start punching numbers into a calculator. Using a calculator this way only ensures you will get the wrong answer quickly. Instead, follow this checklist: 1. Read the problem carefully – you may need to read it twice. 2. Draw and label a…
1. In many industries, the most effective way to reduce the amount of wastewater required treatment is to _. a. install flow meters b. modify the manufacturing process c. practice flow equalization d. use a common drain for all waste streams 2. Determine the recirculation ratio to a trickling filter if the influent flow is…
1. A polishing pond is a form of a tertiary treatment. a. true b. false 2. The depth of a waste treatment pond should be less than three feet. a. true b. false 3. When ponds are operated in series, the influent is split and a portion is diverted to each of two ponds. a….
1. The formula for calculating the volume of a rectangular wet well is _. V = Volume, L = Length, W = Width, A = Area, C = Circumference, P = Perimeter, D = diameter, H = Height a. V = L X W X C b. V = W X A X P c….
1. Sludge wasting from secondary clarifiers, normally required in order to control _. a. effluent BOD b. effluent suspended solids c. aerator mixed liquor solids d. sludge settleablity 2. When organic wastes are discharged to receiving water, oxygen is depleted by _. a. alage during the day b. bacteria c. ducks d. limestone rocks 3….
1. Express a flow rate of 1 cubic feet per second in gallons per minute. (Round to the nearest whole number) 2. Express of flow rate of 1 gallon/minute in gallons/day. 3. If 1 gallon of water weighs 8.34 pounds and 1 cubic foot of water weighs 62.4 pounds, how many gallons are in 1…
1. While performing an inspection of a manhole, you note some significant corrosion/spalling of the concrete structure. This could be caused by _. a. Tree roots entering the system b. The presence of hydrogen sulfide c. Excessive oxygen present in the wastewater flow d. Excessive infiltration and inflow (I & I) in the system 2….
1. Nitrification inhibition may begin when the alkalinity level drops below _ mg/L as CaCO3. a. 50 b. 60 c. 75 d. 100 2. The nitrification unit effluent COD shows a sudden increase. The probable cause is _. a. decrease in effluent BOD. b. Excessive addition of methanol c. lack of nitrate in effluent d….
1. If the chlorine chemical dose is 3 mg/L and the feed in lbs/day is 280, what is the flow in MGD? 2. A rectangular basin 12 feet long and 9 feet wide is 6 feet deep. It treats a flow of 90,000 gallons per day. Determine the detention time in hours. 3. Determine the…
