WASTEWATER CLASS C TEST QUESTIONS WITH CORRECT ANSWERS 2025

WASTEWATER CLASS C TEST QUESTIONS WITH CORRECT
ANSWERS 2025.


What test indicates the efficiency of a trickling filter? -- Answer ✔✔ Percent BOD
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removal

The temperature in an anaerobic digester should NOT change more than? -- Answer
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✔✔ 1°C per day
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What does a short circuiting in a WW pond cause? -- Answer ✔✔ Decreases detention
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time

What way does a bell spigot go? -- Answer ✔✔ Upgrade/upstream or uphill
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What is the proper PH level for an aerobic digester? -- Answer ✔✔ 6.8 to 7.4
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What is the most important micro-organism in WW treatment? -- Answer ✔✔ Bacteria
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What causes ponding in a trickling filter? -- Answer ✔✔ First 6-12 inches of filter is
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clogged

What must WW ponds have? -- Answer ✔✔ Multiple inlets and outlets
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A pump with a worn out impeller and bearing will? -- Answer ✔✔ Pump slower and
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require more energy than one with a perfect impeller
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What is a high corrosive gas in lift stations? -- Answer ✔✔ Hydrogen sulfide
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What is the purpose of floats in a lift station? -- Answer ✔✔ Regulate water level, even
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out wear on pumps
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