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The Effects of Low Organic Loading on an SMBR System

Xin Yuan

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Abstract

The low organic loading,that is,F/M0.1 g CODcr/gMLSS·d,could bring the activated sludge in the Membrane Bioreactor(MBR)into endogenesis respiration.The sludge concentration decreased and the sludge activity deteriorated.The CODcr and polysaccharide concentrations in the reactor were obviously higher that those in the influent and effluent,which was caused by microbial accumulation before membrane filtration.The soluble microbial products were easy to be absorbed by the membrane surface to form a gel layer,which could induce the increase of trans-membrane pressure,causing membrane fouling,and inhibiting the activities of the microbial.Low concentration microorganisms with low activities have a weak absorption and degradation ability for Soluble Microbial Products(SMP).

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What this paper is about

The low organic loading,that is,F/M0.1 g CODcr/gMLSS·d,could bring the activated sludge in the Membrane Bioreactor(MBR)into endogenesis respiration.The sludge concentration decreased and the sludge activity deteriorated.The CODcr and polysaccharide concentrations in the reactor were obviously higher that those in the influent and effluent,which was caused by microbial accumulation before membrane filtration.The soluble microbial products were easy to be absorbed by the membrane surface to form a gel layer,which could induce the increase of trans-membrane pressure,causing membrane fouling,and inhibiting the activities of the microbial.Low concentration microorganisms with low activities have a weak absorption and degradation ability for Soluble Microbial Products(SMP).

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Available abstract

The low organic loading,that is,F/M0.1 g CODcr/gMLSS·d,could bring the activated sludge in the Membrane Bioreactor(MBR)into endogenesis respiration.The sludge concentration decreased and the sludge activity deteriorated.The CODcr and polysaccharide concentrations in the reactor were obviously higher that those in the influent and effluent,which was caused by microbial accumulation before membrane filtration.The soluble microbial products were easy to be absorbed by the membrane surface to form a gel layer,which could induce the increase of trans-membrane pressure,causing membrane fouling,and inhibiting the activities of the microbial.Low concentration microorganisms with low activities have a weak absorption and degradation ability for Soluble Microbial Products(SMP).

Key concepts: Membrane fouling, Membrane bioreactor, Chemistry, Membrane, Effluent, Degradation (telecommunications), Filtration (mathematics), Activated sludge

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