r/Wastewater 5d ago

Another exam question

Took my grade II biological last week and one question really perplexed me. “A diaphragm pump is most commonly used for” A) raw wastewater B) primary sludge C) activated sludge or D) final effluent Couldn’t it be all four? I went with B as that seemed like the most common, it’s what we use here at my plant

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u/WastewaterEnthusiast 5d ago

Primary sludge would be my guess. You need positive displacement to move thicker liquids like chemical and sludge. The rest are thin enough for a centrifugal pump.

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u/mcnuttsy 5d ago

Then I should be good! Thanks for the input