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Texas Waste Water Treatment Final Exam Review - Statistics
General Stats
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This quiz has been taken 118 times
108 since last reset
- The average score is 17 of 30
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| The extent of treatment required for a waste discharge depends on ________. | water quality standards set for the receiving stream | 95%
|
| Bacteria may be classified by which of the following? | All of the above | 91%
|
| Too high a velocity in a grit chamber can result in ________. | excess grit in the primary clarifier | 86%
|
| Which of the following materials should not go onto a trickling filter? | Large suspended solids | 82%
|
| The moisture content of sludge from a primary clarifier should be which of the following? | 94%–96% | 77%
|
| Which type of bacteria adapts best to changing environmental oxygen conditions? | Facultative | 77%
|
| The purpose of the microorganisms that are present in biological treatment processes is to ________. | trap and consume contaminants in wastewater | 77%
|
| The TCEQ requires a chlorine residual of at least ________. | 1.0 mg/L residual after 20 minute contact | 73%
|
| Which of the following should digester gas contain? | 65%–75% methane | 73%
|
| Which activated sludge process has 20+ hours detention time in the aeration basin? | Extended Air | 73%
|
| Septic wastewater ________. | is the result of bacterial decomposition in the absence of oxygen | 68%
|
| Testing of mixed liquor indicates the MLSS is 3,500 mg/L, and the settling test shows that a 1,000 mL sample settles to 350 mL after 30 minutes. What is the SVI and sludge quality? | 100 and good | 64%
|
| Which of the following is formed when gas chlorine is added to water? | HCL AND HOCL | 64%
|
| A contact stabilization activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to ________. | increase the F/M ratio by wasting more | 64%
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| BOD is a measure of ________. | amount of oxygen used up | 59%
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| Which type of activated sludge process must have primary clarification? | Conventional | 59%
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| Whoever violates any part of the ________ or any permit or order of the TCEQ can be fined up to $25,000 per day per violation. | water code | 59%
|
| A good sludge volume index should range from ________. | 95 to 125 | 55%
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| Which of the following is true of trickling filter media? | Must be durable and provide enough surface area for bacterial growth | 55%
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| A POTW has a flow of 3.5 MGD and an influent BOD of 220 mg/L. Find the pounds of BOD in the influent. | 6,422 lb. | 50%
|
| Total suspended solids are ________. | determined by filtration | 50%
|
| Rotating biological contactors may be ________. | driven by electric motors or trapped air | 50%
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| The organic loading on wastewater stabilization ponds should not exceed ________. | 35 lb. BOD/acre/day | 45%
|
| A treatment plant has two primary clarifiers. Each has a diameter of 40 ft. and a depth of 12 ft. If the design flow is 1.2 MGD, find the surface loading on each clarifier in gal./ft.2/day. Assume the flow is equally split between the two clarifiers. | 478 gal./ft.2/day | 41%
|
| Wastewater stabilization ponds will effectively reduce ________. | BOD and bacteria | 36%
|
| What will be the detention time in days in a pond that is 850 ft. long, 250 ft. wide with an average depth of 4 ft. that is receiving a flow of 0.2 MGD and has a net evaporation loss of 8 in. per 30 day month? | 38.65 days | 27%
|
| A standard rate rock trickling filter is 120 ft. in diameter and 8 ft. deep. What is the hydraulic loading in MG per acre per day if 1.0 MGD is treated? | 3.85 MGAD | 18%
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| The moisture content of sludge transported to a municipal landfill should be less than ________. | 80% | 18%
|
| What is the detention time in hours of a tank 50 ft. long, 25 ft. wide, and 10 ft. deep, with a flow of 2 MGD? | 1.12 hrs | 5%
|
| If 200 lb./day of gas chlorine is added to 2.8 MGD, what is the dosage in mg/L? | 8.6 mg/L | 0%
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