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Establishment of Model for Non-filamentous Sludge Bulking in Sequencing Batch Reactor

Jùnwén Lǐ

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Abstract

The synthetic wastewater with sodium acetate and glucose as substrate was used as influent of SBR.Through fixing concentration of DO and adjustment of C/N ratio and organic loading,the influence of C/N ratio on SBR was investigated from both macroscopic and microcosmic aspects.A model for non-filamentous sludge bulking in SBR was established.The results show that non-filamentous sludge bulking occurs when the influent C/N ratio is 52,organic loading is 1.0 to 1.5 kg/(kg·d),and DO is 5 to 7 mg/L.In the establishment of model for non-filamentous sludge bulking,although the settleability of activated sludge becomes poorer and the effluent is turbid with lower transparency,COD and NH+4-N are still effectively removed,and their removal rates are more than 90%.

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What this paper is about

The synthetic wastewater with sodium acetate and glucose as substrate was used as influent of SBR.Through fixing concentration of DO and adjustment of C/N ratio and organic loading,the influence of C/N ratio on SBR was investigated from both macroscopic and microcosmic aspects.A model for non-filamentous sludge bulking in SBR was established.The results show that non-filamentous sludge bulking occurs when the influent C/N ratio is 52,organic loading is 1.0 to 1.5 kg/(kg·d),and DO is 5 to 7 mg/L.In the establishment of model for non-filamentous sludge bulking,although the settleability of activated sludge becomes poorer and the effluent is turbid with lower transparency,COD and NH+4-N are still effectively removed,and their removal rates are more than 90%.

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Available abstract

The synthetic wastewater with sodium acetate and glucose as substrate was used as influent of SBR.Through fixing concentration of DO and adjustment of C/N ratio and organic loading,the influence of C/N ratio on SBR was investigated from both macroscopic and microcosmic aspects.A model for non-filamentous sludge bulking in SBR was established.The results show that non-filamentous sludge bulking occurs when the influent C/N ratio is 52,organic loading is 1.0 to 1.5 kg/(kg·d),and DO is 5 to 7 mg/L.In the establishment of model for non-filamentous sludge bulking,although the settleability of activated sludge becomes poorer and the effluent is turbid with lower transparency,COD and NH+4-N are still effectively removed,and their removal rates are more than 90%.

Key concepts: Segmented filamentous bacteria, Effluent, Sequencing batch reactor, Pulp and paper industry, Activated sludge, Chemistry, Sodium acetate, Wastewater

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