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The detention period in a septic tank is assumed to be at _________

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The detention period in a septic tank is assumed to be at _________

(a) 20 min

(b) 30 min

(c) 40 min

(d) 25 min

I got this question in a national level competition.

Question is taken from Masonry Platform, Water Tank & Motor Garage topic in portion Methods of Building Estimate & Estimate of Building of Civil Engineering Drawing

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The correct option is (b) 30 min

Easy explanation: A septic tank can be defined as primary sedimentation tank with large detention time (12 to 36hrs against a period of 2hrs in an ordinary sedimentation tank). In un-sewered rural and urban areas septic tanks are suitable for disposal of night soil. But sufficient water should be available as water is required for flow of the night soil from latrine to the septic tank and for proper functioning of the septic tank.

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