AI Article Synopsis
- The study examined how different sludge interchange rates (SIR) affect sludge reduction in the oxic-settling-anoxic (OSA) process, comparing it to a traditional system.
- At a SIR of 11%, the OSA system showed optimal performance with increased sludge reduction when using unsettled sewage compared to settled sewage.
- The findings indicate that while higher SIR enhances volatile solids destruction and efficient nitrification/denitrification, it doesn't impact effluent quality or sludge settleability in the main bioreactor.
Article Abstract
The impact of sludge interchange rate (SIR) on sludge reduction by oxic-settling-anoxic (OSA) process was investigated. The sludge yield of an OSA system (a sequencing batch reactor, SBR, integrated with external anoxic reactors) was compared to that of a control (an SBR attached to a single-pass aerobic digester). SIR (%) is the percentage by volume of sludge returned from the external reactor into the main bioreactor of the OSA, and was varied from 0% to 22%. OSA achieved greater sludge reduction when fed with unsettled sewage (sCOD=113mg/L) rather than settled sewage (sCOD=60mg/L). The SIR of 11% resulted in the highest OSA performance. At the optimum SIR, higher volatile solids destruction and nitrification/denitrification (i.e., conversion of destroyed volatile solids into inert forms) were observed in the external anoxic and intermittently aerated (i.e., aerobic/anoxic) reactors, respectively. Denitrification in the aerobic/anoxic reactor was inefficient without SIR. Effluent quality and sludge settleability of the main SBR were unaffected by SIR.
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| http://dx.doi.org/10.1016/j.biortech.2016.01.010 | DOI Listing |
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