TEXAS WASTEWATER CLASS B EXAM 2024| ACTUAL EXAM QUESTIONS WITH CORRECT ANSWERS| ALREADY PASSED AND GRADED A+ The name of the State Agency responsible for enforcing pollution control laws in Texas - Answer - Texas Commission of Environmental Quality The term pathogenic means - Answer - Capable of causing disease The minimum separation between sewer lines and potable water lines is - Answer - 9 feet A licensed wastewater operator is a professional - Answer - 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 - Answer - Filtering a sample The Biochemical oxygen Demand (BOD) of a sample is based on - Answer - Measuring the dissolved oxygen (DO) used The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the operator - Answer - How the plant was operating 5 days ago Which of the following are dangerous gasses that are likely to be present in lift stations and manholes? - Answer - Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide A preferred hydraulic method of cleaning sewer lines is - Answer - Hydro Jet Cleaner Ways to reduce bad odors coming from a collection system - Answer - 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 - Answer - ductile iron, Poly Vinyl Chloride (PVC) Before entering a confined space a worker should - Answer - Use approved monitoring device and check for the presence of dangerous gasses, ventilate the space with a blower, wear a safety harness a nd attach a life line A properly designed and operated primary sedimentation tank should remove percent of incoming BOD - Answer - 30-40% Devices that may be used to determine the level of sewage in a lift station - Answer - air bubbler, floats, electrodes, Acoustic (sonic) What is the most important role of aerobic bacteria in the treatment of wastewater? - Answer - decompose organic matter The hydraulic loading of a trickling filter may be determined by - Answer - flow rate and filter area These can be used to dewater sludge - Answer - belt press, drying beds, solid bowl centrifuge, gravity thickener Most important to providing adequate sewage treatment in a stabilization pond - Answer - sunlight, algae, bacteria and time Offensive and objectionable odors which sometimes occur in trickling filters usually indicate - Answer - septic conditions are present Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be maintained at or about - Answer - 2 to 4 mg/L Contributes to the infiltration in a collection system - Answer - breaks in the main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains When a centrifuge pump loses prime the - Answer - pump is no longer moving liquid A Rotating Biological Contactor (RBC) is - Answer - fixed firm biological treatment process Needs to be checked regularly to properly operate an activated sludge treatment plant - Answer - aeration equipment and mixed liquor solids
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