Wastewater Treatment Class B Texas: Questions and Answers, Exams of Nursing

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Answers 2025

The name of the State Agency responsible for enforcing pollution control laws in Texas - Correct Answers ✅✅Texas Commission of Environmental Quality The term pathogenic means - Correct Answers ✅✅Capable of causing disease The minimum separation between sewer lines and potable water lines is - Correct Answers ✅✅9 feet A licensed wastewater operator is a professional - Correct Answers ✅✅consistently does best job possible, practices personal safety, strives to improve job knowledge, strives to keep the plant and collection system in the best appearance and working order An important step in testing a sample for Total Suspended Solids is - Correct Answers ✅✅Filtering a sample The Biochemical oxygen Demand (BOD) of a sample is based on - Correct Answers ✅✅Measuring the dissolved oxygen (DO) used The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the operator - Correct Answers ✅✅How the plant was operating 5 days ago

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Which of the following are dangerous gasses that are likely to be present in lift stations and manholes? - Correct Answers ✅✅Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide A preferred hydraulic method of cleaning sewer lines is - Correct Answers ✅✅Hydro Jet Cleaner Ways to reduce bad odors coming from a collection system - Correct Answers ✅✅routinely cleaning slow running or low flow lines, adding chlorine or hydrogen peroxide to the collection system Types of pipe that are commonly used in wastewater collection system

• Correct Answers ✅✅ductile iron, Poly Vinyl Chloride (PVC) Before entering a confined space a worker should - Correct Answers ✅✅Use approved monitoring device and check for the presence of dangerous gasses, ventilate the space with a blower, wear a safety harness and attach a life line A properly designed and operated primary sedimentation tank should remove _____ percent of incoming BOD - Correct Answers ✅✅30- 40%

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Contributes to the infiltration in a collection system - Correct Answers ✅✅breaks in the main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains When a centrifuge pump loses prime the - Correct Answers ✅✅pump is no longer moving liquid A Rotating Biological Contactor (RBC) is - Correct Answers ✅✅fixed firm biological treatment process Needs to be checked regularly to properly operate an activated sludge treatment plant - Correct Answers ✅✅aeration equipment and mixed liquor solids Point source discharges are - Correct Answers ✅✅discharges that come from pipes or ditches that are monitored, controlled and inspected Non-point discharges are - Correct Answers ✅✅discharges that have intermittent, dispersed flows having little or no control

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The Texas Water Code establishes the protection of water quality and quantity of the state by - Correct Answers ✅✅setting stream standards, issues permits for discharges, identifies non-point source controls, and establishes water reuse. The wastewater plant operator is primarily responsible for - Correct Answers ✅✅treating wastewater discharged into the community Chapter ___ of the Texas Water Code is the state law controlling water pollution and ___ authority to control discharges in Texas - Correct Answers ✅✅Chapter 26 and Texas Commission of Environmental Quality The Texas Commission on Environmental Quality can revoke an operator's license if the operator - Correct Answers ✅✅causes permit violation, falsifies records or neglects their duty If accidental discharge, bypass, or spill (SSO) of wastewater occurs the responsible party MUST notify TCEQ regional offices within ____ hours - Correct Answers ✅✅ 24 Aerobic Bacteria require_____ in the water for their metabolism - Correct Answers ✅✅oxygen

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Dangerous gases are produced during bacterial decomposition of organics in wastewater. The main gasses are - Correct Answers ✅✅Hydrogen sulfide, carbon dioxide and methane The majority of Dissolved Oxygen in raw sewage comes from - Correct Answers ✅✅Potable Drinking Water Each person contributes approximately ______ lbs of BOD to the system daily. - Correct Answers ✅✅0. Sources of waste water include - Correct Answers ✅✅domestic, storm water, commercial, food processing, agricultural and industrial A sewer manhole provides access into the system for cleaning or service. A manhole is located - Correct Answers ✅✅at changes in alignment, diameter, grade, direction and intersection New manholes must have an inside diameter of at least ______ feet and the entry access must be at least ____inches. - Correct Answers ✅✅4 feet and 24 inches In the past ____ was used to construct manholes. This product is prohibited for construction or grading today - Correct Answers ✅✅brick and mortar

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Verified clay and Poly Vinyl Chloride (PVC) are the most common pipe materials used for sewer lines but other materials are available such as

• Correct Answers ✅✅ductile iron, cast iron, acrylontrile butadiene styrene (ABS) Concrete, polyethylene & asbestos concrete Whenever wastewater cannot flow to the treatment plant by _____ a _____ is typically used - Correct Answers ✅✅gravity/ lift station The primary cause of stoppage in a collection system is _____ and _____ - Correct Answers ✅✅grease/roots The _____pump is most commonly used in a lift station - Correct Answers ✅✅centrifugal A centrifugal pump must be ____ or it will not pump - Correct Answers ✅✅primed ______ gas is very toxic and deadens the sense of ______ - Correct Answers ✅✅Hydrogen Sulifide/smell ______ gas is colorless, odorless and heavier than air - Correct Answers ✅✅Methane

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Inflow and Infiltration (I&I) typically refers to - Correct Answers ✅✅unaccounted for water in the system after heavy rains If the ____ loading on the plant is high, the operator would need to ____Dissolved Oxygen (DO) levels. - Correct Answers ✅✅Organic/Increase A simple method for indicating when to waste sludge is - Correct Answers ✅✅30 minute settling test Organic loading of a stabilization pond is about ____ pounds of BOD/acre/day with a detention time of at least ___ days. - Correct Answers ✅✅35 BOD/ 30 Days Anaerobic digesters are covered to keep out ____, and to trap useful methane which can be used to keep the digester warm. - Correct Answers ✅✅free oxygen Unstable anareobic sludge contains streaks of _________ or ________.

• Correct Answers ✅✅gray/green Aerobic digestion is an ____process whereby the aerobic bacteria consume themselves - Correct Answers ✅✅Endogenous

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Approved disposal methods for digested, dewatered, sludge's are landfill, ____ and ____. - Correct Answers ✅✅Incineration & Land Application Landfill applied sludge must have a solids content of at least _________percent - Correct Answers ✅✅ 20 Calcium Hypochlorite (HTH) is a strong _______ and reacts violently with _________. - Correct Answers ✅✅Oxidizer/Oil & Hydrocarbons When added to water chlorine forms _____&_______acid - Correct Answers ✅✅Hydrochlorous and Hydrochloric When ammonia is present in wastewater and reacts with chlorine_________are formed - Correct Answers ✅✅Chloramines Effluent dosage of chlorine in the contact chamber must produce a total combined residual of - Correct Answers ✅✅1.0 mg/L after 20 minutes

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This treatment device is commonly used to separate and remove large solids from raw wastewater - Correct Answers ✅✅A Mechanically raked bar screen ___________would have an adverse effect on the proper settling of solids in a clarifier. - Correct Answers ✅✅A short circuiting flow pattern This test would give the best information on how efficiently a trickling filter was operating - Correct Answers ✅✅Percent BOD Removal This trickling filter problem could be reduced by increasing the recirculation ratio - Correct Answers ✅✅Filter files What gases are produced by the controlled anaerobic digestion of wastewater sludge's - Correct Answers ✅✅Methane & Carbon Dioxide These diseases are caused by pathogenic organisms that may be present in raw wastewater - Correct Answers ✅✅Hepatitis, typhoid, paratyphoid,dysentery, cholera, gastroenteritis, polio, hookworm and giardiasis

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During heavy rain it is possible that manholes and lift stations may overflow, discharge waste materials into roadways or ditches. This type of discharge (SSO) would be - Correct Answers ✅✅considered an unavoidable discharge, a violation of the Texas Water Code, a bypass that must be reported within 24 hours and considered a health hazard An effective way for the collection system worker to prevent infection by waterborn pathogenic organism is to - Correct Answers ✅✅Wear protective clothing and avoid direct contact with waste water _________will increase the chances that sewage will turn septic - Correct Answers ✅✅Stoppages in the main line Extensive use of garbage disposals (grinders) in a community would likely have the following effect on the collection system - Correct Answers ✅✅Increase the amount of flow, solids, and grease The minimum size for a gravity flow sewer line on city right-of-way and the minimum grade is - Correct Answers ✅✅6 inch and a grade of 0.50 percent The most accurate way to find the average wastewater flow rate in an existing 10-inch sewer main is - Correct Answers ✅✅Obtaining actual flow data & verifying with field data

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A ____________ would be the best to determine if a storm drain is connected to a sanitary sewer line. - Correct Answers ✅✅Smoke Test _________ would most commonly be used to seal a number of joint leaks on a main with minimal interruption - Correct Answers ✅✅internal grouting Pre-treatment of wastewater would include: - Correct Answers ✅✅Coarse or fine screening, grinding and grit removal and grease removal and pre-aeration Primary treatment of wastewater would include - Correct Answers ✅✅settling tanks or basins, scum collection and removal, sludge collection and removal Secondary treatment typically used today would include - Correct Answers ✅✅Stabilization ponds, trickling filters, rotating biological contractors (RBC) & activated sludge Essential components of the wastewater collection system include - Correct Answers ✅✅Sewer mains & piping, Lift Stations, Pumps, Grease & Sand traps, & Manholes

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Grit removal would be considered - Correct Answers ✅✅A part of Primary Treatment The protozoa that causes dysentery would most likely be destroyed by - Correct Answers ✅✅Disinfection Using final plant effluent in cooling towers would be a - Correct Answers ✅✅Beneficial way to reuse treated effluent TCEQ may authorize discharge of untreated wastewater into or near a receiving stream in extreme cases. This is referred to as - Correct Answers ✅✅Bypass Enforcement action from TCEQ may be taken if pollution or waste violates the Texas Water Code. Violations of Water Code may include - Correct Answers ✅✅Unauthorized discharge, accidental discharge & health hazard Solids in wastewater are classified as - Correct Answers ✅✅Total (TR), Suspended (TSS), Dissolved (TDS), Settleable (SS), Non-setteable, Floatable, Organic and Inorganic Total Suspended Solids (TSS) are those that - Correct Answers ✅✅Can be filtered out

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Acute toxicity occurs when - Correct Answers ✅✅There is a rapid die off of treatment organisms Chronic toxicity occurs when - Correct Answers ✅✅Certain microorganisms become inactivated but others continue to work resulting in a sick biological process A mechanical device that screens & cuts large solids in small particles - Correct Answers ✅✅Cumminuter Detention time in wastewater typically refers to - Correct Answers ✅✅The time sewage is kept in a sedimentation basis There are five (5) major components to a trickling filter - Correct Answers ✅✅Filter floor, underdrain, walls, filter media, & distributer arms Zoogleal Mass refers to - Correct Answers ✅✅A thick layer of jelly like slime where organisms bacteria, fungi, protozoa and ciliates thrive. The efficiency of a trickling filter is measured in - Correct Answers ✅✅Percent BOD Removed

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Common operating problems with a trickling filter include - Correct Answers ✅✅Ponding, Filter files, Odors, Clogging of Nozzles, & Snails Wastewater Stabilization Ponds are an approved process for wastewater treatment. Organic loading of Stabilization Ponds is typically - Correct Answers ✅✅35 lbs BOD/Acre/Day with a minimum of 30 days detention time Wastewater Stabilization Ponds work through a complex process which includes - Correct Answers ✅✅Sunlight, Oxygen, Nutrients, Algae, and Bacteria Facultative Lagoons have two zones of treatment - Correct Answers ✅✅an aerobic surface layer and an anaerobic bottom layer Typically one could expect ____ % BOD removal in a Facultative Lagoon

• Correct Answers ✅✅ 50 Aerated Lagoons rely on ______ to provide ____and _____ - Correct Answers ✅✅Mechanical aeration/ Aeration & mixing The most common method of dewatering and drying sludge is - Correct Answers ✅✅drying bed