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In biological oxidation process, depending on the organic load, the oxidation takes place ___________

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In biological oxidation process, depending on the organic load, the oxidation takes place ___________

(a) 1-4Hours

(b) 4-8Hours

(c) 8-16Hours

(d) 16-20Hours

The question was posed to me in an interview for internship.

Question is taken from Biological Oxidation Process topic in division Water of Applied Chemistry

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Right option is (b) 4-8Hours

For explanation I would say: In biological oxidation process, depending on the organic load, the oxidation process takes place up to 4 to 8 hours. Organic impurities are reduced by the biological oxidation process by micro organisms.

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