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What are HRT (Hydraulic Retention Time) and SRT (solids retention time), how do they relate and...

What are HRT (Hydraulic Retention Time) and SRT (solids retention time), how do they relate and control treatment?

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HRT  HYDRAULIC RETENTION TIME

It is the term used in Waste water Treatment/Activated sludge process

HRT means the statistical average time which a mass or matter or particles pass through reactor for treatment purpose.

Time measured in hours

Usually for muncipal waste water required HRT time is 12 to 24 hours

SRT SOLIDS RETENTION TIME

It means the time which the solids present in reactor for traetment.

These both are usually for removing COD Chemical Oxygen Demand.

These two parameters helps us in design of reactor that is dimensions etc.,

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