Wastewater Class B Texas Question & Answers 2024, Exams of Nursing

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Wastewater Class B Texas Question & Answers 2024 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 Wastewater Class B Texas Question & Answers 2024 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% Wastewater Class B Texas Question & Answers 2024 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 Anaerobic Bacteria _____ live with O2 present in the water for their metabolism - Correct Answers ✅cannot Wastewater Class B Texas Question & Answers 2024 Facultative Bacteria require__________in the water for their metabolism - Correct Answers ✅either aerobic or anaerobic conditions Chemical characteristics of sewage include - Correct Answers ✅solids, greases, dissolved oxygen, O2 Demand, pH, and gasses _________removes Total Suspended Solids (TSS) - Correct Answers ✅filtration Inorganic solids include - Correct Answers ✅sand, grit and minerals Organic solids include - Correct Answers ✅organic materials from plants, animals or humans A good plant influent pH is about - Correct Answers ✅7.2 Dangerous gases are produced during bacterial decomposition of organics in wastewater. The main gasses are - Correct Answers ✅Hydrogen sulfide, carbon dioxide and methane Wastewater Class B Texas Question & Answers 2024 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 ✅0.17 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 Verified clay and Poly Vinyl Chloride (PVC) are the most common pipe materials used for sewer lines but other materials are available such as Wastewater Class B Texas Question & Answers 2024 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 Approved disposal methods for digested, dewatered, sludge's are landfill, ____ and ____. - Correct Answers ✅Incineration & Land Application Wastewater Class B Texas Question & Answers 2024 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 Besides disinfection, chlorine has other uses at the wastewater treatment plant such as - Correct Answers ✅Reduces BOD, Odor, Algae growth, Helps with Grease Wastewater Class B Texas Question & Answers 2024 TCEQ allows the reuse of wastewater, some of these include - Correct Answers ✅Irrigation, aquifer recharge, cooling towers and fire protection All reclaimed water piping must be _______in color - Correct Answers ✅purple Before entering a manhole the operator should test for ________and oxygen levels and ________the manhole before entering. - Correct Answers ✅all hazardous gasses and ventilate When a municipal wastewater effluent has a high nitrate level and low ammonia level this most likely means - Correct Answers ✅the effluent has received a high degree of aerobic treatment Total solids in wastewater are the sum of - Correct Answers ✅Settleable and volatile solids This treatment device is commonly used to separate and remove large solids from raw wastewater - Correct Answers ✅A Mechanically raked bar screen Wastewater Class B Texas Question & Answers 2024 A __________ pump would most likely be used when discharging into a 10" diameter pressure sewer main. - Correct Answers ✅Centrifugal Excessive power consumption by a pump could be caused by - Correct Answers ✅Worn bearings and worn impeller Trench safety is a great concern in Texas. OSHA requires that anytime an excavation is greater than __ feet deep it must be protected by ______. - Correct Answers ✅5 feet / An approved Trench Box, Shoring, or Sloping In an excavation if a ladder is used as a means of exit, it must extend ________feet above the ground and be secured and within ____ feet laterally of anyone in the excavation. - Correct Answers ✅3 feet / 25 feet laterally 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 Wastewater Class B Texas Question & Answers 2024 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 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 Wastewater Class B Texas Question & Answers 2024 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 Total Dissolved Solids (TDS) are those that - Correct Answers ✅cannot be filtered out Settable Solids (SS) are those that - Correct Answers ✅Settle out when left standing for extended periods of time Wastewater Class B Texas Question & Answers 2024 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 Digester gas typically contains about ________%_______ - Correct Answers ✅65-75% methane The depth of sludge drawn to a drying bed should be - Correct Answers ✅Approximately 9 inches Wastewater Class B Texas Question & Answers 2024 Newly hired personnel have _________to become licensed. - Correct Answers ✅1 year Force Mains and fittings must have a pressure rating of at least - Correct Answers ✅150 psi Most pumping stations and electrical equipment used today in wastewater collection or treatment is ________ and typically either _______ or _________ volts - Correct Answers ✅A.C. (Alternating Current) & 220 or 440 and in some cases A.C. (Alternating Current) & 100 or 208 To avoid electrical shock, the operator should ________ if they are experiencing equipment failures or power related issues - Correct Answers ✅Refer the problem to a trained electrical repairperson and do not attempt to check fuses or open the disconnect box and Notify the power provider and let them send out a serviceman to assure the problem is not on the provider's side. When using Hydraulic Hydro Jetting sewer cleaning equipment the operator will want to go from a _______ manhole and clean toward the stoppage to avoid _________. - Correct Answers ✅Clear or open / Forcing sewage into customer homes or businesses Wastewater Class B Texas Question & Answers 2024 The Activated Sludge Process can produce a high degree of treatment. Typically one could expect a ______to_______% BOD removal - Correct Answers ✅90 to 99% The Activated Sludge plant has five (5) Critical Components. They are - Correct Answers ✅Oxygen supply, Aeration tanks, Clarifiers, Return & Waste The Activated Sludge process is an ________process. - Correct Answers ✅Aerobic In the activated sludge process aeration tanks provide the space necessary to _______, ________, & _______ and return biological solids. - Correct Answers ✅Mix, aerate, & Hold Influent In the active sludge process, Utilization is the process where - Correct Answers ✅Food supply is changed into a liquid state for use In the activated sludge process, Stabilization is - Correct Answers ✅Wastes biologically converted to water, carbon dioxide, or new cells In the activated sludge process, the _______ is called the heart of the activated sludge process. - Correct Answers ✅Clarifier Wastewater Class B Texas Question & Answers 2024 In the activated sludge process, daily observation of the aeration basin treatment processes are essential. The operator should pay close attention to - Correct Answers ✅Surface turbulence, Foam, Odors, & Color In the activated sludge process, daily observation of the final clarifier is also essential. The operator should pay close attention to - Correct Answers ✅Surface scum, Sludge blanket, Weir Flow, Rising solids, & Clarifier overflow In the activated sludge process, five (5) Important control parameters are - Correct Answers ✅Dissolved Oxygen level, Aerator solids level, Solids quality, Rate of returned sludge, & Wasting rate In the activated sludge process, Dissolved Oxygen levels throughout the aeration basins are measured using a portable DO meter. The operator should keep DO levels between ______ and _______. - Correct Answers ✅2 mg/L and 4.0 mg/L In the activated sludge process, "Classic Bulking" is a common problem typically caused by - Correct Answers ✅Low density sludge In the activated sludge process, Sludge Rising differs from "Sludge Bulking" and "Sludge Rising" is typically associated - Correct Answers ✅Nitrification - De-nitrification process Wastewater Class B Texas Question & Answers 2024 In the activated sludge process, techniques used to reduce "Frothing & Foaming" typically include - Correct Answers ✅Adjusting sludge age, Reducing the amount of air, Spraying the frothing area with water, Applying de-foaming agents In the activated sludge process, floc is very important to the settling process. Floc is composed primarily of - Correct Answers ✅Bacteria, Protozoa, Microscopic Animals, & Fungi In the activated sludge plants, the operator will experience problems. Some of the common Treatment plant problems include - Correct Answers ✅Insufficent capacity, Equipment failures, Design inadequacies, Poor maintenance, & Inflow rates exceed plant capacities. In the activated sludge plants the operator will experience problems. Some of the common Influent problems include - Correct Answers ✅Septic inflow, Organic overloading, and under loading, Hydraulic overloading, Solids washout during storm inflow, Toxic substances, Shock loads, & Nutrient deficiencies In the activated sludge plants, the operator will experience problems. Some common Operational problems include - Correct Answers ✅Sludge quality, foaming, improper operating techniques Wastewater Class B Texas Question & Answers 2024 In the activated sludge plants, the operator will experience problems. Some common Environmental problems include. - Correct Answers ✅Low temperatures, System pH out of range, & Excessive algae growth In the activated sludge plants, to properly set the clarifier return rate the operator must know three things - Correct Answers ✅Return activated sludge rate, Sludge blanket thickness, & the Solids concentration of the return flow The typical sludge age for extended aeration plants is - Correct Answers ✅20 to 40 days In the activated sludge plant, good quality sludge will settle _________& _______ over _________ minute period. - Correct Answers ✅Gently & Uniformly over 15 to 20 minutes In the activated sludge plant, old sludge quality will settle ________& _________ over ________ minute period. - Correct Answers ✅Rapidly and ragged over 5 minutes. In the activated sludge plant, there are (5) important nitroen transformation processes that occur by microorganisms. They are- - Correct Answers ✅Assumilation, Ammonification, Nitrification, Denitrification, & Nitrogen fixation.