NEHA Wastewater Practice Test

These questions are part of the practice quiz. Start practicing

• What does the term "eutrophication" refer to?
• Which of the following is NOT a consequence of improper sewage disposal?
• Wastewater strength is primarily expressed in terms of which of the following?
• How does temperature impact microbial activity in wastewater treatment?
• What does a higher water retention capacity in soil generally indicate?
• Which common indicator is used to measure organic pollution in water?
• Why is the proper disposal of sewage critical?
• What does a well-structured granular soil promote in the context of wastewater management?
• Loam is composed of which materials?
• How much sludge is typically accumulated per person per year in a normal home?
• How is the permeability of soil primarily related?
• Which of the following is NOT typically removed by chemical coagulation processes?
• What is a septic system?
• Which factor is least likely to impact the effectiveness of disinfection in sewage treatment?
• What is the term for the situation when storm water and domestic sewage enter the same sewer system?
• Which method of sludge disposal is typically known for its high energy consumption?
• What can happen if a septic tank is pumped during a wet period?
• In the context of wastewater treatment, what is the definition of sludge?
• What type of wastewater treatment uses constructed wetlands?
• Which parasite is removed less effectively by primary sedimentation?
• What factors influence the performance of a wastewater treatment process?
• Which septic-tank additive compound is discouraged?
• What is one of the results of flooding from a septic system?
• Which bacteria are primarily responsible for aerobic decomposition in wastewater?
• What is a significant disadvantage of landfilling sludge?
• For how long can some pathogenic organisms found in wastewater survive temperature extremes?
• Which method is favored for the disposal of domestic wastewater?
• Which of the following systems typically incorporates membrane technology for wastewater treatment?
• What is an inadequate method for assessing soil suitability for septic systems?
• If a septic tank will have a garbage disposal unit feeding into it, what should be done?
• Which of these treatments does NOT remove leptospires effectively?
• What is the role of a grit chamber in wastewater treatment?
• What term is used to describe man-made organic compounds that degrade very slowly?
• What processes are involved in removing most bacteria, viruses, and protozoa from wastewater?
• Which type of bacteria plays a lesser role in converting sewage into "soil" liquids and gases?
• True or False: Soil containing loam will remove most of the phosphorus in sewage effluent.
• What does BOD measure in wastewater?
• What is the purpose of a grease trap in a wastewater system?
• What are the primary treatment processes in wastewater management?
• What is an interceptor sewer designed to do?
• What term describes the ability of soil to absorb and allow water and air to pass through?
• What is the term used for wastewater originating from toilets or latrines?
• What can lead to system failures in wastewater treatment plants?
• When assessing soil properties, which measurement is crucial for determining drainage capabilities?
• What is a critical reason for reducing pollutants in sewage disposal?
• What factors influence the effectiveness of sewage disinfection?
• Which bacteria is primarily responsible for aerobic digestion in sewage treatment?
• What is the main purpose of a wastewater treatment facility?
• What is the main purpose of aeration in wastewater treatment systems?
• What is the primary function of microorganisms within wastewater treatment systems?
• What is the main reason for regularly monitoring pollutant concentrations in wastewater facilities?
• Which aspect of soil may negatively affect its ability to absorb water if poorly developed?
• What challenges do wastewater treatment facilities face as a result of climate change?
• What is the recommended detention time for wastewater in a septic tank?
• Which chemical is typically used in a residential sewage treatment system with a surface discharge?
• How can exposure to excreta or sewage lead to disease transmission?
• Which process helps mitigate odors emitted from wastewater treatment facilities?
• What is the significance of a sedimentation tank?
• What is one way pathogens in wastewater can be transmitted to humans?
• What process, when supplemented by disinfection, can remove nearly all bacteria, viruses, protozoa, and helminthes?
• Which parameter is essential for evaluating the biological treatment efficiency?
• What type of bacteria thrive in environments without oxygen and are critical in anaerobic digestion processes?
• What is the purpose of a rotating biological contactor (RBC) in wastewater treatment?
• Which process of wastewater treatment occurs in septic tanks?
• To obtain reproducible results with a soil percolation test, what should be done before the test?
• Why is the study of soil permeability important in wastewater management?
• What does the term "effluent" refer to in wastewater treatment?
• What material should cover the top of the absorption field gravel in septic systems?
• What is the purpose of dewatering in sludge management?
• Which method is least likely to be used for treating high-strength industrial wastewater?
• The traditional absorption field should be laid in trenches not more than how many inches below the ground surface?
• Which substance is non-toxic to aquatic organisms, a good virucide, and adds oxygen to treated wastewater?
• How often should septic tanks serving commercial operators be inspected for cleaning?
• What role does the disinfection step play in wastewater treatment?
• How frequently should a septic tank for a private residence be serviced?
• Any excavation in clay, loam, silt or sand more than what depth should have side wall protection?
• Which type of soil generally has a good balance of air and water movement?
• Describe the specific role of phytoremediation in wastewater management.
• Which treatment stage is focused on polishing the effluent?
• What distinguishes primary treatment from secondary treatment in wastewater management?
• What does sludge and scum accumulation in a septic tank indicate?
• Which organization issues permits for pollutant discharge into US waters?
• True or False: The recommended backfill over the absorption field is generally 8-12 inches.
• What does BOD stand for in wastewater treatment?
• What is a primary benefit of connecting to a public sewer system?
• Which of the following factors influences the permeability of soil?
• Which type of lake typically has high levels of nutrients?
• What is the primary function of a clarifier?
• What is a common method used to mitigate the risk of wastewater exposure?
• What gases can be commonly found in sewer gas?
• What is one characteristic of soil that breaks apart easily under pressure?
• What is the significance of measuring BOD in wastewater?
• What potential health risk is associated with plants that use trickling filters and activated sludge?
• What is a typical consequence of not servicing a septic system regularly?
• What is the purpose of aeration in wastewater treatment?
• The minimum distance between field lines in a treatment absorption field is?
• What is the maximum recommended depth for installation of an absorption field?
• What type of soil is typically best for agriculture due to its balanced nutrient content?
• What is the primary role of disinfection in wastewater treatment?
• What typically indicates a well-designed wastewater treatment facility?
• What are the environmental regulations governing wastewater treatment mainly concerned with?
• What color should a lump of good soil characteristics ideally be?
• Which parameters are typically measured in wastewater effluent?
• A soil which is mottled brown and red would indicate what condition?
• What should be the frequency of cleaning for a residential septic tank?
• What is the primary purpose of tertiary treatment in wastewater processes?
• What classification is given to a young lake that has low nutrient levels?
• The primary purpose of a sand filter in wastewater treatment is to?
• Which of the following practices is least effective in treating wastewater?
• Which of the following is a potential outcome if the sludge accumulation is too high?
• What does a fat, oil, and grease (FOG) separator do?
• Which contaminants are targeted in biological treatment processes?
• Common causes of failure in septic tank seepage field systems include improper sizing and which of the following?
• What are some common methods for sludge disposal?
• Which of the following is an advantage of ozone disinfection?
• Why is effective management of non-point source pollution important in wastewater systems?
• What does an NPDES permit regulate in wastewater treatment?
• According to sedimentation data, which organism has the best removal rate?
• Which property of soil is most closely linked to its chemical composition?
• What type of soil is likely indicated by consistent brown mottling?
• Ozone can be beneficial because it can also serve as a source of what?
• How does a lagoon system primarily function in wastewater treatment?
• A water leak no larger than 1/8" in diameter can result in a loss of how many gallons in 24 hours?
• What is the characteristic of the best soil for wastewater absorption?
• Why should sewage sludge not be used as a soil builder if it has not been properly tested?
• What is an advantage of using biofilters in wastewater systems?
• What material should surround field distribution piping, according to standard practice?
• Which of the following could lead to a septic-tank failure?
• What factors affect the reliability of a soil percolation test?
• How do excessive rainstorms affect wastewater treatment facilities?
• Why is the use of a cesspool generally prohibited?
• What does effective treatment of non-point source pollution help protect?
• True or False: The use of serial distribution systems is considered advantageous compared to the use of distribution boxes.
• In soil analysis, what is a key element to evaluate for percolation testing?
• What does bioremediation refer to in wastewater management?
• What is a biological nutrient removal (BNR) system designed to do?
• Which stage of wastewater treatment primarily focuses on removing particulate matter?
• How is the effectiveness of septic systems primarily monitored?
• What regulations dictate the levels of nutrients allowed in wastewater effluent?
• Trickling filters are effective at removing which percentage of viruses and bacteria?
• What is the goal of nutrient removal in wastewater treatment?
• What is a key benefit of well-structured soil?
• How are reactive nitrogen species classified in terms of environmental impact?
• Which type of soil is most suitable for subsurface absorption of wastewater?
• True or False: The depth of septic tanks and the ratio of width to length recommended by most health departments are very similar.
• Which pollutant type is primarily targeted by FOG separators?
• What is typically the goal of monitoring wastewater effluent?
• What is the best definition of septage?
• What is the role of chlorination in wastewater treatment?
• What can affect the longevity of pathogenic organisms in wastewater?
• Why is monitoring effluent quality critical in wastewater management?
• What is the purpose of sludge stabilization?
• Which condition is likely to occur in poorly aerated soil?
• What is a preferred method for sizing absorption fields in soil analysis?
• What is a combined sewer overflow (CSO)?
• What is the difference between aerobic and anaerobic treatment processes?
• Which statement is true about the use of septic-tank cleaners?
• Which parameters are typically monitored regularly in a wastewater treatment facility?
• What is the primary purpose of installing grease traps in a sewer system?
• What is the most common method of applying wastewater to land?
• What is the primary limitation of a septic tank absorption field system?
• What is the importance of pH in wastewater treatment processes?
• What role does soil color play in assessing its characteristics?
• Stream pollution is sometimes indicated by what?
• What is the primary goal of the Clean Water Act concerning wastewater treatment?
• What are potential consequences of improperly treated wastewater discharge?
• What happens when a combined sewer system exceeds its capacity?
• Which type of pollutants are typically removed through physical treatment methods?
• What is a trickling filter in wastewater treatment?
• Which of the following is an explosive component of sewer gas?
• What combination of soil characteristics is often ideal for successful crop production?
• What is the primary purpose of aeration in wastewater treatment?
• Why is monitoring effluent quality essential in wastewater treatment?
• Which of the following statements is true about membrane bioreactors (MBRs)?
• How do municipal wastewater treatment plants typically handle stormwater?
• What factors influence the ability of soil to absorb and allow water and air to pass through?
• What is the main function of a wastewater pump station?
• What is the purpose of disinfection or chlorination of sewerage effluent?
• According to US EPA standards, what should the pH level of secondary treatment effluent be?
• Which operational parameter is important for assessing treatment performance in wastewater facilities?
• What role do enzymes play in wastewater treatment processes?
• What is the purpose of a flow equalization basin?
• Where may low-pressure, vacuum, and cluster systems be used?
• Does adding yeast to a new septic tank increase the digestion speed?
• What does a soil percolation test measure?
• Facultative bacteria can live under which conditions?
• Why are advanced oxidation processes utilized in wastewater treatment?
• What is the primary purpose of the influent wastewater screening process?
• Which process involves using natural or artificial wetlands to treat wastewater?
• Human disease from aerosols of wastewater is mainly related to which process?
• What is the range of virus removal achieved by primary sedimentation?
• How does soil texture affect its permeability?
• During which treatment stage are solids primarily removed?
• Which factor is NOT typically involved in the formulation of soil management practices?
• Who should prepare the sewer plans for an area?
• What does TSS stand for, and why is it important?
• True or False: The recommended minimum distance from the bottom of a trench to the groundwater table is 62 inches.
• What is the most effective method discovered for running a percolation test?