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Which of the following uses long solids retention times to remove biodegradable organic wastes?

(a) Oxidation ditch

(b) Pond sludge

(c) Activated sludge system

(d) Maturation pond

This question was posed to me in an internship interview.

This interesting question is from Wastewater Treatment of Food Processing Industries in chapter Wastewater Treatment of Food Processing Industries of Environmental Biotechnology

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Right choice is (a) Oxidation ditch

The best I can explain: An oxidation ditch is an activated sludge process in which long solids retention time is used to remove biodegradable organics, maturation ponds is for the removal of pathogens, activated sludge system is the biological treatment of wastewater using bacteria, Pond sludge is the accumulation of organic debris at the bottom.

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