1. Less heat is required to maintain the temperature in a digester where thick sludge is pumped than one where relatively thin sludge is pumped to the digester. a. true b. false 2. A scum blanket in a digester may be broken up by vigorously mixing the digester contents. a. true b. false 3. A…
1. Convert 5 cubic feet per second to gallons per minute 2. Convert 0.5 cubic feet per second to gallons per minute 3. Convert 5 gallons per minute to cubic feet per second 4. Convert 50 gallons per minute to cubic feet per second 5. Convert 0.005 cubic feet per second to gallons per minute…
1. Sludge will dry faster if it is put onto a sand drying bed before it is completely digested. a. true b. false 2. The single greatest safety hazard operators are exposed to when working around anaerobic digesters is potentially explosive conditions. a. true b. false 3. Volatile acids should be kept low in an…
1. A benefit in using fixed film reactors is that _. a. biomass is visible to the operator b. odors are not a problem c. snails help degrade organic matter d. temperature variations do not influence performance of process 2. When leaving a filter out of service for several days or longer, the excessive material…
1. Convert to decimals: a. 1/2 b. 2/3 c. 5/7 d. 1/8 2. Convert to percent: a. 0.35 b. 1.27 c. 0.02 d. 3/5 3. Convert to decimals: a. 46% b. 178% c. 0.65% 4. Convert 14,000 cubic feet to gallons 5. Convert 16,348 cubic feet to gallons Answers: 1. a. 0.50 (1) / (2)…
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. 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…
