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