17. (Activated sludge processes) ndichher the folingmts r ie (T o false (\'F\')

Question

17. (Activated sludge processes) ndichher the folingmts r ie (T o false ('F') 17.1. EAAS systems use long SRTs (20-30 days) to partially stabilize the biomass produced. This requires large bioreactors with HRTs (hydraulic retention times) of 24 h or more, but results in excellent process stability and the production of a high-quality effuent. 17.2. In SFAS systems, biomass and oxygen-enriched gas flow co-currently through a staged, covered bioreactor. This allows use of high volumetric organic loading rates and short HRTs (2-4 h). Short SRTs (1-2 days) are also generally used.

Explanation / Answer

Answer 17.1- True

In Dynamic Process Control EAAS systems use long SRTs (20 to 30 days) to partially stabilize the biomass produced. This requires large bioreactors (HRTs of 14 hours or more), but results in excellent process stability and the production of a high-quality effluent.

Answer 17.2- False

In HPOAS system ,biomass and oxygen enriched gas flow co-currently through a staged ,covered bioreactor.This allow use of high volumetric organic loading rates and shoert HRT.

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