PRACTICE EXAM GRADE III TREATMENT - Division of Water Quality

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17. A malfunctioning gas chlorination system has nonnal gas pressure, no feed rateindicated on rotameter, and no injector vacuum. What is the most likely cause ofthe problem?a. Air leak upstream from the rotameterb. Gas line pluggedc. Injector cloggedd. Pressure-reducing valve diaphragm ruptured18. The most critical criterion for determining when a mixed media filter should bebackwashed isa. Filter effluent qualityb. Flow ratec. Head lossd. Visual inspection of the filter surfacel19. The precipitate in coagulation with alum is,aluminuma. Bicarbonateb. Carbonatec. Hydroxided. Sulfate120. Given the following data, what is the mos[ likely cause of the mechanically cleanedbar screen problem?Data: Above normal water differential across bar screenDrive motor shaft turningDrive sprocket, chain, and rake not movingLess than normal flow on bar screen downstream sideBar screen mode selector in automatic positionNormal seasonal flow (influent) coming into bar screenAlarm systems operating normallya. Low influent (incoming) levelb. Raw wastewater pumping units out of servicec. Sheared pin or disengaged clutch on drive unitd. None of the above21. The correct amount of chemical used to remove turbidity is known as thea. Coagulation rangeb. Combination dosagec. Efficiency ranged. Optimum dosage22. The temperature of anaerobic digester should be changed as slowly as possible toa. Avoid overloading the heat exchangerb. Avoid excess heat lossc. Allow digester walls time to adjustd. Allow bacteria time to adjust
24. The quantity of volatile solids in the content of the incoming sludge is an indirectmeasure of thea. Amount of the sample that will evaporate when standingb. "Food" available for bacteria in the digesterc. Number of bacteria in the digesterd. Primary effluent suspended solids25. What organisms will be found in a balanced, good settling mixed liquor?a. Hagellate and amoeboid organismsb. HagelJates and free-swimming ciliates, but no stalked ciliates and rotifersc. Free-swimming and stalked ciliates, some flagellates, and rotifersd. Nematodes, rotifers, ciliates, flagellates, and amoeboids26. Belt filter presses are operated as a process.a. Batchb. Continuousc. Either one, depending on circumstances27. Given the following data, calculate the desired pounds of mixed liquor suspendedsolids (MLSS) in the aeration tank.Data: Primary effluent suspended solids = 120 mg/LInfluent flow = 2.0 mgdDesired sludge age = 5.0 daysAeration tank = 100 ft x 45 ft x 15 ftInfluent BOD = 235 mg/LEffluent suspended solids = 15 mg/La. 6 ()()() Ibb. 8 ()()() Ibc. 10 ()()() Ibd. 12 ()()() Ib28. Required chemical coagulation doses are commonly determined bya. Jartestsb. Measurements of zeta potentialc. Oxidation-reduction investigationsd. Stoichiometric calculations.29. Given the following data, calculate the average velocity in the channel.Data: 2.5-ft wide channelHow depth is 1.4 ftHow rate is 7.2 mgda. 1.2 ftlsecb. 3.2 ftlsecc. 11.2 ftlsecd. 32.2 ftlsecl30. A 240-gpm mixed media filter operated at a rate of 2 gpm/sq ft is backwashed at arate of 15 gpm/sq ft. How many gallons of wash water were used?a. 5 ()()()b. 5400c. 6 ()()()d. 6200
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