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The effect of mixed liquor suspended solids (MLSS) on biofouling in a hybrid membrane bioreactor for the treatment of high concentration organic wastewater

Damayanti, A. and Ujang, Zaini and Salim, Mohd. Razman and Olsson, G. (2011) The effect of mixed liquor suspended solids (MLSS) on biofouling in a hybrid membrane bioreactor for the treatment of high concentration organic wastewater. Water Science and Technology, 63 (8). pp. 1701-1706. ISSN 0273-1223

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Official URL: http://dx.doi.org/10.2166/wst.2011.338

Abstract

Biofouling is a crucial factor in membrane bioreactor (MBR) applications, particularly for high organic loading operations. This paper reports a study on biofouling in an MBR to establish a relationship between critical flux, J(c), mixed liquor suspended solids (MLSS) (ranging from 5 to 20 g L(-1)) and volumetric loading rate (6.3 kg COD m(-3) h(-1)) of palm oil mill effluent (POME). A lab-scale 100 L hybrid MBR consisting of anaerobic, anoxic, and aerobic reactors was used with flat sheet microfiltration (MF) submerged in the aerobic compartment. The food-to-microorganism (F/M) ratio was maintained at 0.18 kg COD kg(-1) MLSSd(-1). The biofouling tendency of the membrane was obtained based on the flux against the transmembrane pressure (TMP) behaviour. The critical flux is sensitive to the MLSS. At the MLSS 20 g L(-1) the critical flux is about four times lower than that for the MLSS concentration of 5 g L(-1). The results showed high removal efficiency of denitrification and nitrification up to 97% at the MLSS concentration 20 g L(-1.) The results show that the operation has to compromise between a high and a low MLSS concentration. The former will favour a higher removal rate, while the latter will favour a higher critical flux.

Item Type:Article
Uncontrolled Keywords:biofouling, flux, membrane bioreactor, MLSS, TMP
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:29486
Deposited By: Yanti Mohd Shah
Deposited On:01 Apr 2013 04:59
Last Modified:25 Apr 2019 01:15

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