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Effective preliminary treatment can also be used to remove the ____

(a) Girt and rag

(b) Carbon dioxide

(c) Nutrients

(d) Oxygen

I had been asked this question in class test.

I want to ask this question from Biological Treatment of Waste Water topic in division Biological Treatment of Waste Water of Environmental Biotechnology

1 Answer

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Best answer
The correct answer is (a) Girt and rag

The best I can explain: Girt and rag has to be removed by preliminary treatment of the waste water to avoid clogging at the later treatment stages, Oxygen is sparged into the waste water to improve aerobic bio degradation, Carbon dioxide and nutrients are required for improving the efficiency of treatment.

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