A Review on the Mechanism, Impacts and Control Methods of Membrane Fouling in MBR System.

Xianjun Du,Izaz Ul Haq,Yaoke Shi,Veeriah Jegatheesan

doi:10.3390/membranes10020024

Xianjun Du, Izaz Ul Haq + Show 2 more

Open Access

https://doi.org/10.3390/membranes10020024

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Journal: Membranes	Publication Date: Feb 4, 2020
Citations: 173	License type: CC BY 4.0

Affiliation: Lanzhou University of Technology, RMIT University

Abstract

Compared with the traditional activated sludge process, a membrane bioreactor (MBR) has many advantages, such as good effluent quality, small floor space, low residual sludge yield and easy automatic control. It has a promising prospect in wastewater treatment and reuse. However, membrane fouling is the biggest obstacle to the wide application of MBR. This paper aims at summarizing the new research progress of membrane fouling mechanism, control, prediction and detection in the MBR systems. Classification, mechanism, influencing factors and control of membrane fouling, membrane life prediction and online monitoring of membrane fouling are discussed. The research trends of relevant research areas in MBR membrane fouling are prospected.

Highlights

Membrane bioreactors (MBRs) combine both biological treatment and physical separation of various pollutants to treat domestic and industrial liquid wastes
Fiber membrane, tubular,inand the4.filter cup membrane modules when operated under dead-end filtration mode
The membrane material should be modified according to treatment objectives

Summary

Introduction

Membrane bioreactors (MBRs) combine both biological treatment and physical separation (using membranes) of various pollutants to treat domestic and industrial liquid wastes. There is no unified statement about the mechanisms of membrane fouling, but from the analysis of the causes of membrane fouling, the following mechanisms of membrane fouling in MBR have been proposed and verified: (i) narrowing of membrane pores; (ii) the adsorption of the solute in the solution by the membrane [3]; (iii) the deposition of the (activated) sludge floc on the membrane surface [4]; and (iv) the compaction of the filter cake layer on the membrane surface. It will reduce permeate flux, increase feed pressure, reduce productivity, increase

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