TX Class C Wastewater Treatment License Exam Questions and Answers (Latest Update 2024), Exams of Nursing

Download TX Class C Wastewater Treatment License Exam Questions and Answers (Latest Update 2024) and more Exams Nursing in PDF only on Docsity! TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Preliminary Treatment - Correct Answer ✅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 Answer ✅preliminary treatment Rotating Biological Contactor - Correct Answer ✅a type of biological secondary treatment process How are protozoa (cause of amoebic dysentery) destroyed? - Correct Answer ✅disinfection Other than stream discharge, what are other ways to dispose of effluent wastewater? - Correct Answer ✅aquifer recharge, evaporation in a pond, and application to farm land by irrigation TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Clean Water Act - Correct Answer ✅gives the basic structure for regulating discharges of pollutants into the waters of the United States Texas Water Code - Correct Answer ✅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 Answer ✅TCEQ Water quality fees may be as high as ____________ per permit? - Correct Answer ✅$115,000 Administrative penalties, up to __________ per day for each violation, may be assessed against any violator. - Correct Answer ✅$25,000 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Ways that oxygen can be depleted in streams - Correct Answer ✅untreated waste discharges, algae masses at night, and high BOD in the effluent A gas found in treatment systems that is NOT dangerous - Correct Answer ✅dissolved oxygen Cycles of decay include - Correct Answer ✅carbon, nitrogen and sulfur A flow totalizer is required when the plant design flow is more than - Correct Answer ✅0.5 MGD Non-hazardous wastes include - Correct Answer ✅chlorides, alkalinity, color, phosphorous and iron Hazardous wastes include - Correct Answer ✅cyanide, sulfides, organics and gasoline TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Synergistic Effect - Correct Answer ✅reaction between waste streams How many cubic feet of screenings per million gallons of wastewater will coarse screens remove? - Correct Answer ✅0.5 to 6.0 Preaeration benefits - Correct Answer ✅freshen wastewater, scour gases and remove grease Main purpose of sedimentation tank - Correct Answer ✅allow scum to rise and solids to settle under quiescent (low velocity) conditions How much settleable solids is removed in primary settling? - Correct Answer ✅90-95% How much suspended solids is removed in primary settling? - Correct Answer ✅50-70% TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) How much BOD is removed in primary settling? - Correct Answer ✅35% How much total organic matter is removed in primary settling? - Correct Answer ✅20-30% What percentage of suspended solids will settle out within 2 hours? - Correct Answer ✅70% Required minutes of detention time for peak flow? - Correct Answer ✅54 Required minutes of detention time for design flow? - Correct Answer ✅108 Benefits of removing grit - Correct Answer ✅wear on pump impellers, line stoppages and taking up space Too high a velocity in a grit chamber can result in what? - Correct Answer ✅excess grit in primary clarifier TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) In an Imhoff tank, the lower compartment serves as the... - Correct Answer ✅digester Wastewater is treated by what organisms? - Correct Answer ✅bacteria, fungi, algae, plants, animals and protozoa How many basic cell structures are there? - Correct Answer ✅2 What factors affect biological growth? - Correct Answer ✅dissolved oxygen level, temperature, pH and available food What is the most important microorganism in wastewater treatment? - Correct Answer ✅bacteria In what ways are bacteria classified? - Correct Answer ✅shape, oxygen needs, temperature and metabolism TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) In the removal process, what must bacteria do? - Correct Answer ✅gather food, digest food, utilize food and give off by-products What limiting factors affect bacteria growth? - Correct Answer ✅pH, temperature, moisture and food What must the operator control in order for microorganisms to do their job? - Correct Answer ✅the environment What by-products are excreted by microorganisms? - Correct Answer ✅CO2, H2O and NH3 and polysaccharides Treatment pond classifications are... - Correct Answer ✅wastewater stabilization ponds, aerated lagoons, facultative lagoons, anaerobic lagoons and hyacinth ponds What will a wastewater stabilization pond effectively reduce? - Correct Answer ✅BOD and bacteria TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Anaerobic lagoon dissolved oxygen content... - Correct Answer ✅none Facultative lagoon dissolved oxygen content... - Correct Answer ✅DO on top and none at bottom Wastewater stabilization pond dissolved oxygen content... - Correct Answer ✅DO throughout (top, bottom and middle) Depth of wastewater stabilization pond - Correct Answer ✅3-5 ft deep Wastewater stabilization ponds are... - Correct Answer ✅aerobic, dependent upon sunlight and shallower than facultative lagoons Benefit of multiple inlets and outlets in treatment ponds are... - Correct Answer ✅prevention of short-circuiting and will assure an evenly distributed flow TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Purpose of wasting solids from an activated sludge system is... - Correct Answer ✅remove excess biological solids, inert solids and old/dead microorganisms Control parameters for activated sludge plants - Correct Answer ✅oxygen levels, wasting rates, sludge quality, return rates and aerator solids levels The air requirements in an activated sludge process are governed by... - Correct Answer ✅organic loading on the plant Sludge bulking is corrected by.... - Correct Answer ✅restoring environmental balance to favor floc-forming bacteria over filamentous organisms Rising sludge and gas bubbles can be caused by... - Correct Answer ✅denitrification in the final clarifier TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) What test can give operators a visual check on sludge quality? - Correct Answer ✅30-minute settling test A conventional activated sludge process has primary clarifiers that remove about ________ percent of the organic load.. - Correct Answer ✅30-40% What activated sludge process parameters can an operator change directly? - Correct Answer ✅aeration rates, waste rates, and return sludge rates What happens when the return sludge rate is too low? - Correct Answer ✅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 Answer ✅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 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) SVI Formula (Sludge Volume Index) - Correct Answer ✅30 min settle test/MLSS x 1000 Normal range for SVI (sludge volume index) - Correct Answer ✅70-150 What DO levels (in aeration) are optimal to maintain health of aerobic microorganisms? - Correct Answer ✅2-4 mg/L How deep should the clarifier blanket be? - Correct Answer ✅filling the bottom 1/4 Weir loadings should not exceed _________ gal/day/linear foot of weir at peak flow (1 MGD or less plant). - Correct Answer ✅20,000 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) 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 Answer ✅large suspended solids Important factors to a well operating trickling filter... - Correct Answer ✅continuous food supply, aerobic conditions and a moist zoogleal mass Basic elements of a trickling filter are... - Correct Answer ✅floor and walls; distributor arms; underdrains and media What must be durable and provide enough surface for bacterial growth with a trickling filter? - Correct Answer ✅filter media The zoogleal mass on a filter is composed mainly of what? - Correct Answer ✅bacteria and algae TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) The materials resulting from the stabilization of waste material as it passes through a trickling filter are... - Correct Answer ✅water, nitrates and carbon dioxide What are zoogleal solids called that are washed off a trickling filter? - Correct Answer ✅sloughings (which settle in the final clarifier) Units commonly used to measure the rate of hydraulic loading are... - Correct Answer ✅lb/ft/day Units commonly used to measure the rate of organic loading include... - Correct Answer ✅lb BOD/acre ft/day and lb BOD/1000 ft3/day Trickling filters may be classified as.... - Correct Answer ✅high-rate; roughing; standard-rate TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) The underdrain system of a standard rate trickling filter should be... - Correct Answer ✅designed to flow half-full The recirculation ratio of a trickling filter has an effect on... - Correct Answer ✅organic matter removal; odors; filter flies What test best indicates the efficiency of a trickling filter? - Correct Answer ✅percent BOD removal Filter operational problems include... - Correct Answer ✅ponding; filter flies (psychoda); odors Filter ponding may be caused by... - Correct Answer ✅poor quality rock; excessive organic loading; inefficient primary clarifier Methods of controlling filter flies include... - Correct Answer ✅flood the filter TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) The most important factor affecting filter performance is the _____ of the secondary effluent applied to the filter. - Correct Answer ✅quality Proper __________ is essential to filter performance. - Correct Answer ✅cleaning What is the absorbent most commonly used for water treatment? - Correct Answer ✅Activated carbon The use of granular activated carbon (GAC) for ______________ removal is common. - Correct Answer ✅organic What can cause problems in granular activated carbon (GAC) treatment? - Correct Answer ✅biological growth What has been tried as oxidizing agents in wastewater treatment? - Correct Answer ✅chlorine dioxide (ClO2) Ozone (O3) TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Chlorine (Cl2) Many over look what kind of oxidizing agent as an oxidant because of its relative ineffectiveness in conventional waste treatment? - Correct Answer ✅ozone Laboratory-scale studies have shown that the changes occurring in the settlement of the floc are greatly influenced by what? - Correct Answer ✅biological activity What is a common coagulant used for chemical precipitation? - Correct Answer ✅aluminum sulfate; sodium aluminate and ferric sulfate What occurs when solutions of two different concentrations are separated by a semipermeable membrane such as cellophane? - Correct Answer ✅osmosis Biological denitrification is accomplished under what conditions by heterotrophic bacteria that use nitrate during TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) the fermentation of organic carbon materials? - Correct Answer ✅anaerobic Electrons pass from the ______ source (the electron donor) to nitrate and nitrite (the electron acceptor) to promote the conversions to nitrogen gas. - Correct Answer ✅carbon As what materials are decomposed, their phosphorus content is converted to orthophosphate? - Correct Answer ✅organic The materials found practical for phosphorus precipitation include the ionic forms of what? - Correct Answer ✅aluminum, iron and calcium The purpose of sludge digestion is... - Correct Answer ✅stabilize the organic matter Sludge types may include... - Correct Answer ✅activated TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Since the majority of _______ digesters are open tanks, digester liquid temperatures are dependent on weather conditions and can fluctuate extensively. - Correct Answer ✅aerobic A minimum value of _________ of oxygen should be maintained in the aerobic digester at all times. - Correct Answer ✅1.0 mg/L The following processes are used to dewater sewage sludge: - Correct Answer ✅vacuum filters, filter presses and centrifuges Sludge drying time is affected most by... - Correct Answer ✅degree of digestion The depth of sludge drawn to a drying bed should be... - Correct Answer ✅about 9 inches TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) The moisture content of sludge transported to a municipal landfill should be less than __________. - Correct Answer ✅80% The most expensive method for the final disposal of sludge is... - Correct Answer ✅incineration Disinfection may also be accomplished by... - Correct Answer ✅ozone, bromine and ultraviolet radiation Forms of chlorine used in wastewater treatment include... - Correct Answer ✅gas, granular and solution Chlorine is available as.... - Correct Answer ✅pure chlorine in a cylinder; sodium hypochlorite solutions from 5% to 15% chlorine; calcium hypochlorite of about 65% effective chlorine When gas chlorine is added to water, the following is formed... - Correct Answer ✅HOCl (hypochlorous acid) and HCl (hydrochloric acid) TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) At 20'C the HOCl (hypochlorous acid) concentration will vary with the pH as follows: - Correct Answer ✅pH 7 - 80% HOCl Chlorine combines with ammonia in wastewater to form.... - Correct Answer ✅Chloramines If a chlorine dosage of 12 mg/L is added to a wastewater effluent containing ammonia and the chlorine demand is 11.5 mg/L, the residual would be ________. - Correct Answer ✅a monochloramine - 0.5 mg/L Chlorine may be used for... - Correct Answer ✅bulking control, disinfection and odor control The TCEQ requires at least _____ mg/L residual after _____ minutes contact. - Correct Answer ✅1 20 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) A flow-weighted "composite" sample is a... - Correct Answer ✅combination of portions of samples collected at regular intervals and combined according to flow A BOD test is... - Correct Answer ✅a major parameter in quality control pH is important in the operation of... - Correct Answer ✅anaerobic digesters; chlorination of wastewater; oxidation ponds Total suspended solids are... - Correct Answer ✅determined by filtration Adequate chlorine residuals will... - Correct Answer ✅destroy pathogenic organisms Dissolved oxygen is necessary in... - Correct Answer ✅secondary treatment processes TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Laboratory tests on an anaerobic digester may be used to determine... - Correct Answer ✅digester loading and quality of supernatant and digested sludge For anaerobic digesters, good sludge, supernatant and gas production is realized at a pH of about... - Correct Answer ✅7.0 The test(s) that best indicate(s) the condition of an anaerobic digester is (are)... - Correct Answer ✅volatile acid concentration The following tests are important in the control of an activated sludge process... - Correct Answer ✅30 min setteability test; oxygen uptake rate; microscopic examination The SVI should range from... - Correct Answer ✅70-150 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) A low SVI may indicate... - Correct Answer ✅sludge is settling too fast A low oxygen uptake rate might indicate... - Correct Answer ✅toxic waters, low DO or low BOD Good activated sludge will contain... - Correct Answer ✅a high percentage of stalked ciliates and large numbers of rotifers The TCEQ monthly effluent report must be submitted to the TCEQ in Austin by the ______ day of the month following the month being reported - Correct Answer ✅20th What substances should NOT be dumped into the collection system? - Correct Answer ✅acids; caustics; chemical fertilizers TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) 1,000,000 gallons per day = - Correct Answer ✅1 MGD 8.34 lb in 1 MG of water = - Correct Answer ✅1 ppm (8.34 lb/8,340,000) 1 gallon of water weighs.. - Correct Answer ✅8.34 pounds 1 day = __________ minutes - Correct Answer ✅1440 pie = - Correct Answer ✅3.14 Percent (%) formula is - Correct Answer ✅Part/Whole X 100 Circumference = - Correct Answer ✅pie X diameter % reduction formula - Correct Answer ✅incoming - outgoing/incoming X 100 TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) Who sets standards for wastewater treatment? - Correct Answer ✅national, state and local government Different treatment plants have different requirements for wastewater treatment (true or false). - Correct Answer ✅True Purpose of primary treatment - Correct Answer ✅removes solids that readily settle or float Purpose of secondary treatment - Correct Answer ✅microscopic living creatures (microorganisms) remove additional contaminants Purpose of advanced (tertiary) treatment - Correct Answer ✅reduces specific contaminants such as suspended solids, ammonia or phosphorous to very low levels to achieve struct effluent standards TX Class C Wastewater Treatment License Exam Questions and Answers (latest Update 2024) What was the first major law to address water pollution? - Correct Answer ✅The Federal Water Pollution Control Act of 1948 What chapter of the Texas Water Code gives the TCEQ jurisdiction over the discharge of waste into adjacent water in the state? - Correct Answer ✅Ch 26