TX Class C Wastewater Treatment License Exam Questions and Answers, Exams of Nursing

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Preliminary Treatment - Correct Answers ✅the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for sedimentation. What stage of treatment is grit removal usually accomplished in? - Correct Answers ✅preliminary treatment Rotating Biological Contactor - Correct Answers ✅a type of biological secondary treatment process How are protozoa (cause of amoebic dysentery) destroyed? - Correct Answers ✅disinfection Other than stream discharge, what are other ways to dispose of effluent wastewater? - Correct Answers ✅aquifer recharge, evaporation in a pond, and application to farm land by irrigation Clean Water Act - Correct Answers ✅gives the basic structure for regulating discharges of pollutants into the waters of the United States

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Texas Water Code - Correct Answers ✅gives the TCEQ jurisdiction over discharges of waste into or adjacent to water in the state Who reviews plans and specifications for new construction projects before construction begins? - Correct Answers ✅TCEQ Water quality fees may be as high as ____________ per permit?

• Correct Answers ✅$115, Administrative penalties, up to __________ per day for each violation, may be assessed against any violator. - Correct Answers ✅$25, Every city with more than ________ in population needs to establish a water pollution control program and hire qualified personnel to administer it. - Correct Answers ✅10, State law requires that reports are to be submitted no later than the ________th day of the following month. - Correct Answers ✅ 20

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Type of organic matter present in wastewater - Correct Answers ✅proteins BOD is a measure of what? - Correct Answers ✅oxygen used up Ways that oxygen can be depleted in streams - Correct Answers ✅untreated waste discharges, algae masses at night, and high BOD in the effluent A gas found in treatment systems that is NOT dangerous - Correct Answers ✅dissolved oxygen Cycles of decay include - Correct Answers ✅carbon, nitrogen and sulfur A flow totalizer is required when the plant design flow is more than - Correct Answers ✅0.5 MGD Non-hazardous wastes include - Correct Answers ✅chlorides, alkalinity, color, phosphorous and iron Hazardous wastes include - Correct Answers ✅cyanide, sulfides, organics and gasoline

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Synergistic Effect - Correct Answers ✅reaction between waste streams How many cubic feet of screenings per million gallons of wastewater will coarse screens remove? - Correct Answers ✅0.5 to 6. Preaeration benefits - Correct Answers ✅freshen wastewater, scour gases and remove grease Main purpose of sedimentation tank - Correct Answers ✅allow scum to rise and solids to settle under quiescent (low velocity) conditions How much settleable solids is removed in primary settling? - Correct Answers ✅90-95% How much suspended solids is removed in primary settling? - Correct Answers ✅50-70% How much BOD is removed in primary settling? - Correct Answers ✅35%

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What is a flow equalization used for? - Correct Answers ✅to reduce excessive flows or organic loads How can grease be removed before sedimentation? - Correct Answers ✅by chlorination, aeration and skimming A primary clarifier should remove most of what? - Correct Answers ✅settleable solids What conditions can influence settling of solids? - Correct Answers ✅temperature, condition of solids and flow velocity Sludge from a primary clarifier should have a moisture content of what? - Correct Answers ✅94-96% By performing Imhoff cone tests on the clarifier inlet and outlet, the operator can determine what? - Correct Answers ✅the efficiency of the clarifier and a sludge pumping schedule When temperature increases, water becomes... - Correct Answers ✅less dense What problem is short-circuiting in a clarifier? - Correct Answers ✅flow problem

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How should raw sludge be pumped to a digester? - Correct Answers ✅slowly when it is adequately thickened In an Imhoff tank, the upper compartment serves as the... - Correct Answers ✅clarifier In an Imhoff tank, the lower compartment serves as the... - Correct Answers ✅digester Wastewater is treated by what organisms? - Correct Answers ✅bacteria, fungi, algae, plants, animals and protozoa How many basic cell structures are there? - Correct Answers ✅ 2 What factors affect biological growth? - Correct Answers ✅dissolved oxygen level, temperature, pH and available food What is the most important microorganism in wastewater treatment? - Correct Answers ✅bacteria

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Facultative lagoon dissolved oxygen content... - Correct Answers ✅DO on top and none at bottom Wastewater stabilization pond dissolved oxygen content... - Correct Answers ✅DO throughout (top, bottom and middle) Depth of wastewater stabilization pond - Correct Answers ✅3-5 ft deep Wastewater stabilization ponds are... - Correct Answers ✅aerobic, dependent upon sunlight and shallower than facultative lagoons Benefit of multiple inlets and outlets in treatment ponds are...

• Correct Answers ✅prevention of short-circuiting and will assure an evenly distributed flow The organic loading on wastewater stabilization ponds should not exceed - Correct Answers ✅35 lb. BOD/acre/day Depth of facultative lagoons is - Correct Answers ✅5-8 ft deep

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Raw wastewater anaerobic ponds are usually used by... - Correct Answers ✅livestock feedlots, meat packing operations and industrial wastes generators Essential needs of an efficient wastewater stabilization pond... - Correct Answers ✅DO, algae and bacteria The ideal orientation of a wastewater stabilization pond would be... - Correct Answers ✅parallel with prevailing winds What does short-circuiting in a pond cause? - Correct Answers ✅reduction in detention time A chemical factor influencing the efficiency of wastewater stabilization ponds is... - Correct Answers ✅carbon dioxide Good housekeeping around ponds includes... - Correct Answers ✅keeping dike clean Control tests on pond effluents include - Correct Answers ✅BOD, TSS and pH Purpose of return activated sludge - Correct Answers ✅to reseed the biological reactor with treatment microorganisms

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What test can give operators a visual check on sludge quality? - Correct Answers ✅30-minute settling test A conventional activated sludge process has primary clarifiers that remove about ________ percent of the organic load.. - Correct Answers ✅30-40% What activated sludge process parameters can an operator change directly? - Correct Answers ✅aeration rates, waste rates, and return sludge rates What happens when the return sludge rate is too low? - Correct Answers ✅there will be insufficient organisms to treat the waste load entering the aeration basin and the sludge blanket in the secondary clarifier could become too high Physical causes of sludge bulking are... - Correct Answers ✅excessive hydraulic loading, settled sludge that is not promptly removed from the clarifier, inadequate weir lengths and improper ratio of depth to surface area of the final clarifier SVI Formula

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(Sludge Volume Index) - Correct Answers ✅30 min settle test/MLSS x 1000 Normal range for SVI (sludge volume index) - Correct Answers ✅70- What DO levels (in aeration) are optimal to maintain health of aerobic microorganisms? - Correct Answers ✅2-4 mg/L How deep should the clarifier blanket be? - Correct Answers ✅filling the bottom 1/ Weir loadings should not exceed _________ gal/day/linear foot of weir at peak flow (1 MGD or less plant). - Correct Answers ✅20, Weir loadings should not exceed ___________ gal/day/linear foot of weir at peak flow (1 MGD or above plant). - Correct Answers ✅30, Is activated sludge aerobic or anaerobic? - Correct Answers ✅aerobic Why do pumps continually send RAS to the aeration tank? - Correct Answers ✅to reseed the biological reaction in the

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What conditions should an operator observe in a well controlled activated sludge process? - Correct Answers ✅surface turbulence/uniform roll pattern; foam/small amount of light-colored, crisp foam; odors/mild, earthy; color/medium-brown What conditions should an operator observe in a well controlled clarifier? - Correct Answers ✅very little surface scum; a sludge blanket covering 1/4 of the bottom; uniform weir flow (all the way around); almost no rising solids and overflow should be clear and free of floc What type solids cannot go onto a trickling filter? - Correct Answers ✅large suspended solids Important factors to a well operating trickling filter... - Correct Answers ✅continuous food supply, aerobic conditions and a moist zoogleal mass Basic elements of a trickling filter are... - Correct Answers ✅floor and walls; distributor arms; underdrains and media What must be durable and provide enough surface for bacterial growth with a trickling filter? - Correct Answers ✅filter media

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The zoogleal mass on a filter is composed mainly of what? - Correct Answers ✅bacteria and algae The materials resulting from the stabilization of waste material as it passes through a trickling filter are... - Correct Answers ✅water, nitrates and carbon dioxide What are zoogleal solids called that are washed off a trickling filter? - Correct Answers ✅sloughings (which settle in the final clarifier) Units commonly used to measure the rate of hydraulic loading are... - Correct Answers ✅lb/ft/day Units commonly used to measure the rate of organic loading include... - Correct Answers ✅lb BOD/acre ft/day and lb BOD/1000 ft3/day Trickling filters may be classified as.... - Correct Answers ✅high-rate; roughing; standard-rate The underdrain system of a standard rate trickling filter should be... - Correct Answers ✅designed to flow half-full

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Rotating biological contactors are usually covered to... - Correct Answers ✅prevent algae growth on the media The rotating discs should be... - Correct Answers ✅partially submerged in the wastewater Rotating biological contactors may be... - Correct Answers ✅driven by electric motors or trapped air The biological growth on the disc of a rotating biological contactor should... - Correct Answers ✅contain approximately 50,000 mg/L solids; be 0.05-0.1 inch thick after one or two weeks; and be gray to brown in color The RBC (rotating biological contactor) unit must be preceded by a... - Correct Answers ✅primary clarifier or fine screen A condition(s) that adversely affect(s) the operation of a rotating biological contactor is... - Correct Answers ✅toxic materials from industrial wastes; hydrogen sulfide; high or low pH A buildup of solids in the tank of the rotating biological contactor may be caused by... - Correct Answers ✅poor primary clarification

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Advanced treatment processes strive to provide a ______________ removal level of specific compounds, suspended solids, and oxygen-demanding materials than cannot be achieved through secondary treatment alone. - Correct Answers ✅higher Direct filtration of secondary effluent is often used to reduce _____ solids to low levels. - Correct Answers ✅suspended The most important factor affecting filter performance is the _____ of the secondary effluent applied to the filter. - Correct Answers ✅quality Proper __________ is essential to filter performance. - Correct Answers ✅cleaning What is the absorbent most commonly used for water treatment? - Correct Answers ✅Activated carbon The use of granular activated carbon (GAC) for ______________ removal is common. - Correct Answers ✅organic What can cause problems in granular activated carbon (GAC) treatment? - Correct Answers ✅biological growth