If you do not retain the bacteria longer than the water they cannot develop a effective degrader culture for the pollutants in the wastewater.
The definition of "activated sludge" doesn't apply if SRT isn't considerably longer than HRT.
To prevent the wash-out of the sludge (the bacteria, granules and other components) along with water. If this happens, the degrading bacteria population in the reactor would decrease with time, which will affect the efficiency. HRT is adjusted in such a way so that SRT is greater than HRT.
SRT = (V*X)/(Xw*Qw) so if SRT=HRT that mean the system will be operate as flow throw and the time of contacts between Bacteria and Wastewater will be short to enable Bacteria to utilize the organic matter in the Wastewater so SRT should be kept greater than HRT to have good treatment
SRT is kept higher than HRT with a view to provide enough time to microbes to acclimatize themselves to the new environment and biodegrade the decomposable organics along with new cells production
- Badges
- Science topic
- Similar topics
- Phytochemistry
- Extracts