Waste Water Operator Level 1 Exam Prep 2024/2025

Waste Water Operator Level 1 Exam Prep 2024/2025 In the activated sludge process, some of the activated sludge must be wasted to... A. Prevent excessive solid buildup B. Prevent clogging of the sludge return line C. Prevent overloading of sludge return pumps D. Increase digester gas production A. Prevent excessive solid buildup The best operating strategy for feeding primary sludge to an anaerobic digester is to feed... A. Several time a day B. Large quantities once or twice a day C. Once a day D. When the volatile solids drop below 60% A. Several time a day Why is scum skimmed from the liquid surface of a primary settling tank? A. To reduce load on the digester B. To eliminate interference with sludge removal C. To allow aeration of the tank contents D. To reduce odor and insect nuisance B. To eliminate interference with sludge removal Which of the following test would give the fastest indication of toxicity in an activated sludge process? A. Oxygen Uptake Rate (OUR) B. Settleometer C. MLSS D. Microscopic Observation A. Oxygen Uptake Rate (OUR) Filamentous bulking of activated sludge may be controlled temporarily by... A. Adding sodium chloride to the aeration tank B. Spraying water on the aeration tank surface C. Carefully chlorinating the return sludge and mixed liquor D. Aerating the final settling tank C. Carefully chlorinating the return sludge and mixed liquor Since reaction rates are lower during the winter, the operator of an activated sludge plant will usually... A. Increase dissolved oxygen levels B. Decrease MCRT C. Decrease wasting D. Increase MCRT D. Increase MCRT In a healthy activated sludge process which of the following organisms will most likely be found in the greatest numbers? A. Stalked Ciliates B. Amoebas C. Free swimming ciliates D. Nymphs A. Stalked Ciliates Alkalinity is a measure of the ability of wastewater to... A. Neutralize base B. Neutralize acid C. Dissolve organics D. Maintain constant temperature B. Neutralize acid What is one advantage of a COD test over a BOD test? A. Shorter test time B. More accurate C. Safer D. Less chemicals needed A. Shorter test time Fecal coliform results are reported as MPN per... A. 10 mL B. 50 mL C. 100 mL D. 1,000 mL C. 100 mL A BOD can be removed from the incubator at 5 days plus of minus... A. 1 hour B. 2 hours C. 3 hours D. 4 hours C. 3 hours When performing an MPN the sample dilution is considered positive when... A. The Durham tube is found upside down B. The sample turns color from amber to brown C. No bubbles are found in the Durham tube D. Gas bubbles are found in the Durham tube D. Gas bubbles are found in the Durham tube Entrained air frequently contributes to... A. Reduced wet well capacity B. Less odor around the pump station C. Lower electrical costs D. Pump cavitation D. Pump cavitation What is the purpose of a SCADA system? A. Clean grease lines B. Justify more cleaning crews C. Control equipment and collect data D. Set collection and data appointments C. Control equipment and collect data Which of the following can cause overheating of mechanical equipment? A. Water hammer B. Under-greasing C. Over-greasing D. Dried out packing C. Over-greasing Anaerobic decomposition of wastewater produces... A. Ammonium chloride B. Hydrogen sulfide C. Carbon monoxide D. Copper sulfate B. Hydrogen sulfide Wastewater entering a treatment plant typically is... A. Somewhat warmer than tap water B. The same temp. as tap water C. Somewhat cooler than tap water D. Very cooler than tap water A. Somewhat warmer than tap water Reviewing all aspects of the wastewater treatment system to determine what would occur during various types of emergency situations is know as... A. Management effectiveness survey B. Environmental audit C. Comprehensive performance evaluation D. Vulnerability assessment D. Vulnerability assessment How much education does an operator need? A. Depends largely on the type of treatment facility and also on local certification and entry-level job requirements