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Waste Water Operator LV 1 Exam PREP 2024-25 Questions & Answers Solved 100% Correct

HEAL100 Health Care — exam and revision material · Other

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Health Care exam material, 13 pages. Originally published on StudyMerit.

Pages
13
Academic year
2025/2026
Language
English

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WASTE WATER OPERATOR LV 1 EXAM PREP 2024/25 QUESTIONS & ANSWERS SOLVED 100% CORRECT!! 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 Answer - 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% Answer - 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

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D. To reduce odor and insect nuisance Answer - 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 Answer - 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 Answer - 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 Answer - D. Increase MCRT

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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 Answer - 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 Answer - 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 Answer - A. Shorter test time Fecal coliform results are reported as MPN per... A. 10 mL B. 50 mL C. 100 mL

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