Missouri Wastewater D Practice Exam

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• A centrifugal pump's efficiency is typically decreased under which condition?
• What is the circumference of a circular tank with a diameter of 60 feet?
• What are the gases produced from sewage treatment that can be particularly hazardous?
• Grit should be removed early in the treatment process because:
• During what treatment step might hydraulic overload cause solids problems?
• How is concentration in a solution often quantified in water quality?
• Organic loading in a wastewater stabilization pond is defined as pounds of what?
• The primary purpose of a facultative lagoon is to:
• What does the term "Activated Sludge" refer to?
• What unit is used to express the velocity in a sewer line?
• What safety measure should an operator take before cleaning a wet-well that is 20 feet deep?
• Which pollutant is primarily responsible for causing algae blooms?
• What is the area of a circle formula?
• What is the flow rate required to prevent solids from settling in the sewer line?
• In hydraulic systems, how is energy often expressed?
• What is primary treatment mainly defined as?
• What is the pressure exerted by a 10-foot column of water in psi?
• What is the primary cause of wear on pump impellers?
• What is the effect of raising the pH in a digester?
• How is mg./l commonly defined in liquid measurements?
• Grit chambers designed to remove grit without organic matter should have a velocity of:
• Bacteria which require free oxygen are categorized as anaerobic. Is this statement true or false?
• Activated sludge treatment is noted for what characteristic?
• What condition should be monitored to maintain effective wastewater treatment processes?
• What is the typical nature of fresh wastewater?
• How is the efficiency of aerobic treatment typically measured?
• How many gallons are in 1 cubic foot?
• Which of the following gases is considered flammable or explosive in sewers?
• If properly designed and operated, a waste stabilization lagoon is considered a complete sewage treatment plant. Is this statement true or false?
• All settleable solids in sewage may be considered as suspended solids, but not all suspended solids are necessarily settleable solids. Is this statement true or false?
• How is pressure in fluid systems often measured?
• Which scenario is likely to lead to pump failure?
• What is the most common type of pump used in a lift station?
• Which statement about the rapid wear of pumps pertains to grit in wastewater?
• Screening, grit removal, comminution, and flow equalization are all part of what process?
• Which component is typically included in wastewater treatment processes?
• What describes facultative ponds?
• Name three common pests that can be found around lagoon facilities.
• What type of treatment is activated sludge?
• What is the primary function of the air relief valve in a pump system?
• What is one benefit of duckweed in a facultative lagoon?
• In wastewater terms, what does the abbreviation "gpm" indicate?
• What is the five-day BOD of normal domestic raw sewage?
• What can happen if the effluent weir is not level?
• Which safety precaution is important when handling chemicals in a wastewater treatment plant?
• What is a common indicator of the effectiveness of a sludge drying bed?
• Which condition can lead to a lack of sufficient biomass in a treatment facility?
• The effluent from secondary treatment systems primarily contains what type of material?
• What color is septic sewage typically described as?
• At what temperature should an incubator for the B.O.D. test be controlled?
• What is the equivalent of ppm?
• The responsibility for compliance with the condition of the NPDES permit rests with whom?
• How many gallons are contained in one cubic foot?
• How many grams are contained in 1 pound?
• What does eutrophication of a lake signify?
• At what oven temperature is TSS analysis performed?
• The minimum dissolved oxygen in your lagoon should be ________ to inhibit the formation of odors.
• Which disease is characterized by gastrointestinal symptoms from wastewater exposure?
• Which of the following is an example of a harmful sewer gas?
• Which of the following is NOT a required operational analysis for lagoon control?
• What percentage of sewage is approximately water?
• In wastewater treatment, what aspect is primarily examined during secondary treatment?
• What is the characteristic odor associated with hydrogen sulfide gas?
• Which of the following is NOT one of the elements of the hydrological cycle?
• What do pathogenic bacteria primarily cause?
• What is the fundamental principle behind pressure in fluids?
• Which of the following substances can negatively affect the operation of a wastewater treatment plant?
• Which of the following measures volume in water treatment?
• What is the general purpose of sewage treatment?
• What could indicate that wastewater is experiencing anaerobic conditions?
• How is the packing around the shaft of a centrifugal pump adjusted?
• How should raw sludge be added to digesters for optimal digestion?
• What is considered a neutral pH value?
• What is the minimum vertical separation required when installing collection systems lines in relation to water lines?
• What is the percent volatile solids if the ash weight is 0.0103g and the dry weight is 0.0149g?
• What is the usual detention period of sewage in a sedimentation tank?
• Any stream will purify itself in three miles. Is this statement true or false?
• Why should wastewater pumps not have water seal connections directly to the city water supply?
• In hydraulic systems, what does 1 psi typically correspond to in feet of water?
• If a tank has a height of 10 feet and the area of its base is 20 square feet, what is its volume?
• When should sodium nitrate be added to an oxidation pond?
• Which unit is commonly used to express the height of a water column leading to pressure measurements?
• What is the first calculation step in converting 52 degrees Fahrenheit to Celsius?
• A facultative lagoon primarily obtains its oxygen through which process?
• What is the equivalent of 1 cubic foot per second in gallons per minute?
• What is the formula to convert degrees Fahrenheit to degrees Celsius?
• Which of these is NOT an impact of adding too much sludge at once to digesters?
• What is a common sign of excessive nitrates in water supplies?
• If an operator collects 200 ml samples from a lagoon's effluent every hour, what type of sample is created?
• What type of pump is commonly used for handling sewage in lift stations?
• Why is it dangerous for an operator to be in a closed space with a serious gas leak?
• What does gpm stand for in wastewater management?
• What characteristic does granular material like sand or gravel provide for sewer lines?
• What condition can result from an excessively high flow rate in a clarifier?
• What does the term short circuiting mean when applied to the lagoon facility?
• In which phases can water be found?
• A round clarifier has a diameter of 35 feet. What is its surface area?
• What could happen to the solids if flow rates into a clarifier exceed the surface hydraulic loading design?
• How many feet of water are equivalent to 1 lb per square inch?
• In wastewater, which type of solids are subject to decomposition?
• If the pH of a plant influent changes suddenly and consistently at the same time each week, what is a probable cause?
• What will happen to the pH of water when lime is added?
• Why is it essential to ensure that backfill material is free of large rocks and debris?
• The primary purpose of sludge beds is what?
• What should laboratory test samples of sewage be?
• What attribute of chlorine gas poses a safety risk?
• How much does 1 cubic foot of water weigh?
• Which of the following is the correct unit for measuring flow rate in gallons per minute?
• What should be installed in the chlorinator room to ensure safety?
• A three-phase induction motor will have its direction of rotation reversed if any two line leads are interchanged. Is this statement true or false?
• What does Biochemical Oxygen Demand (BOD) measure?
• What is the pressurized line called that leaves a lift station?
• What are the primary processes involved in wastewater treatment?
• What condition can cause damage to centrifugal pump motors?
• What is the name of the test used to determine chlorine residual?
• What gases are commonly found in sewers?
• If you pump 260 gallons into a 600-gallon tank, what is the percentage of the tank that is full?
• What are the four steps of mechanical treatment in wastewater processing?
• Dissolved Oxygen (D.O.) is measured in which unit?
• Settled activated sludge is generally how compared to raw sludge?
• Backfill material on sewer lines should be selected material. Is this statement true or false?
• How many square feet are in one square yard?
• What should be done immediately if concentrated acid is spilled on the floor?
• What is the area of 1 acre in square feet?
• Which of the following lab control tests is NOT typically used to operate a lagoon?
• How much power does 1 horsepower equate to in watts?
• If the pressure is measured as 30 psi, how tall would the corresponding water column be in feet?
• What role do algae play in a sewage lagoon?
• What is a common byproduct of anaerobic digestion in wastewater treatment?
• What is the relationship between the area of the lagoon and the number of acres?
• When water is heated, how does the pressure change within a confined space?
• What is the most probable cause of a pump spinning backwards after being turned off?
• Pretreatment equipment typically consists of:
• What does the term "anoxic" refer to?
• In a separate sewer system, how is stormwater managed?
• What is the main purpose of comminution in wastewater treatment?
• Which gas is NOT primarily composed of hydrogen sulfide and oxygen?
• How many acres is a wastewater lagoon that has dimensions of 450 feet by 300 feet?
• What is the volume of a cylinder formula?
• What is the main concern associated with combined sewer systems during heavy rainfall?
• Where is the rock in most trickling filters placed?
• Both aerobic and anaerobic bacterial reactions may occur in which of the following?
• How can the surface area in acres of a lagoon primary cell that is 400 feet by 150 feet be calculated?
• The process of adding raw sludge to digesters must be managed carefully to prevent what?
• One mg/l is for all intents and purposes equal to how many ppm?
• What type of pump is typically used for pumping primary sludge?
• One pound per square inch of pressure is equivalent to how many feet of head of water?
• How can emergent vegetation, such as cattails, best be controlled on the pond bottom?
• What impact can untreated wastewater have on the environment?
• What characteristic is typically associated with septic sewage?
• What is the primary method used to determine total suspended solids in wastewater?
• If wastewater has a pH value of 6.5, what can it be classified as?
• What is the molecular weight of Sodium Hydroxide (NaOH) using the atomic weights of Sodium, Oxygen, and Hydrogen?
• In an Imhoff cone test, settleable solids are recorded in which measurement?
• In terms of pressure measurement, what does psi stand for?
• A stiff white foam on the aeration basin when starting a new facility indicates what issue?
• Which type of plant life is essential for the proper function of stabilization or oxidation ponds?
• What is a benefit of digested sludge in agriculture?
• If a tank's width is 10 feet, depth is 16 feet, and length is 700 feet, how would you calculate its volume?
• What does the presence of high BOD in wastewater indicate?
• The material collected on bar screens and skimmings from the primary clarifier is properly disposed of by:
• Which treatment unit is not dependent on aerobic bacteria for its efficiency?
• The purpose of primary clarification of sewage is to remove the settleable solids by settling. Is this statement true or false?
• What would be a likely characteristic of wastewater with a high level of solids?
• Which factor directly influences the conversion between feet of water and psi?
• How much does one gallon of water weigh?
• Pneumatic ejectors are designed to lift liquids and solids in suspension by means of compressed air. Is this statement true or false?
• What does the unit "mg/L" measure in water?
• What issue can cause septic sludge to "burp" to the surface of primary settling tanks?
• Good primary sludge withdrawn from a primary settling tank typically contains what percentage of solids?
• Why should the effluent weir of settling tanks be level?
• Why is lime added to a digester?
• What is a consequence of untreated wastewater on aquatic ecosystems?
• How does lime treatment affect the pH of wastewater?
• What is the purpose of a check valve on a lift station force main?
• Which of the following describes a primary settling unit?
• What is the horsepower equivalent of 1 kilowatt?
• Sodium or ammonium nitrate may be used to control septic conditions in a lagoon. Is this statement true or false?
• What can cause compacted and hardened sludge in a hopper?
• What is the primary purpose of a sludge drying bed?
• Which of the following forms of bacteria can thrive in an oxygen-free environment?
• What is the formula for velocity in terms of distance and time?
• What does 1 ppm equal in pounds for one million gallons?
• Which of the following represents the relationship between feet of water and psi?
• Which two of the following are considered pollutants found in wastewater?
• What does "coning" in digesters refer to?
• The amount of oxygen that can be dissolved in water decreases as the temperature of the water increases. Is this statement true or false?
• What is the timeframe within which state regulations require notification for an unanticipated bypass/SSO?
• Which of the following is NOT a type of sewer system?
• What is the indicator methyl orange used to test for?
• What should the velocity of wastewater entering a clarifier promote?
• If a large quantity of acid waste is discharged into the sanitary sewer, why is it important to determine when it reaches the plant?
• For whom is a reasonably accurate operation report for sewage treatment most valuable?
• What will happen to the pumps if a bubbler system line becomes clogged?
• What is the equivalent pressure in psi of 1 foot of water?
• What would be the psi equivalent of a 5-foot water column?
• What is the horizontal separation required when installing collection systems lines in relation to water lines?
• How does chlorine gas compare to air in terms of weight?
• Which of the following diseases can be caused by contact with wastewater?
• Why is proper ventilation crucial in enclosed spaces during maintenance tasks?
• Chlorine gas is characterized by which property regarding air?
• What is the result in acres for a lagoon primary cell that measures 400 feet by 150 feet?
• What describes sewage that is dark in color and lacking in oxygen?
• What is the primary function of algae in sewage treatment?
• What is the formula for calculating gallons per day (GPD) from gallons per minute (GPM)?
• Which of the following strategies is commonly used to manage and treat wastewater effectively?
• What are the three general forms of bacteria in the activated sludge process?
• Compared to commercial fertilizer, the fertilizer value of digested sludge is generally:
• What is the relationship between 1 mg/L and ppm?
• What color are the fecal colonies on the membrane filtration method of bacterial analysis?
• Which statement regarding trickling filters is true?
• Which of the following is NOT a variation in the activated sludge process?
• What is the minimum dissolved oxygen level required for fish to live and reproduce normally?
• What chemicals can be utilized to eliminate septic areas in a new oxidation pond?
• What is the weight of 1 gallon of water in pounds?
• What relationship exists between weight of water in pounds and the height of its column in feet?
• If an operator monitors DO and pH levels in a facultative lagoon hourly, what trend should they expect to observe?
• How many cubic feet are in 1 acre foot?
• Which type of pump is most commonly used in a sludge pumping installation?
• Why do some wastewater treatment processes require specific removal of floatable solids?
• What is the average velocity of a sewer flow, measured in feet per second?
• What is the incubation time and temperature for the analysis of BOD?
• What test is typically used to measure the organic strength of wastewater?
• Which of the following are types of wastewater?
• What is the volume of water in gallons for a channel that is 10 feet wide, 16 feet deep, and 700 feet long?
• Which method is primarily used to eliminate undesirable odors from waste treatment facilities?
• What happens to psi when you double the water column height while keeping it constant?
• Which of the following is a common test for the presence of chlorine in water?
• How many hours of training are required to maintain a State of Missouri wastewater operator certification?
• Which chemical can be used to neutralize acid spills?
• What does BOD stand for in wastewater management?
• When reading a graduated cylinder, you read the liquid level at which point?
• What is the main purpose of the fixed nozzles or rotary distributor on a trickling filter?
• What is the primary function of a trickling filter?
• What does mgd stand for in wastewater terminology?
• What is a primary goal of wastewater treatment in relation to solids?
• The term Ozonation refers to which process?
• What does GPM stand for in wastewater measurements?
• What is the primary purpose of a grit chamber in wastewater treatment?
• Methemoglobinemia (Blue Baby Syndrome) is caused by what component in wastewater?
• What type of activated sludge process utilizes only one basin for its entire treatment process?
• Why are good operating records important in wastewater management?
• Which of the following statements is TRUE about centrifugal pumps?
• What shape is a tank with a diameter of 60 feet described as?