Performance of anoxic-oxic membrane bioreactor for Azo dye biodegradation

Komala, Puti Sri and Effendi, Agus Jatnika and Wenten, IG. and Wisjnuprapto, Wisjnuprapto Performance of anoxic-oxic membrane bioreactor for Azo dye biodegradation. -.

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Abstract

A modified activated sludge, contact stabilization process coupled with anoxic reactor and combined with external ultrafiltration membrane is used for azo dye biodegradation. Feed consists of azo dye Remazol Black V and co-substrate tempe industry wastewater as organic source. To obtain the expected HRTs control of the flux stability is required. In this research the performance of two kinds anoxic-oxic membrane bioreactor with and without aeration modes on membrane feed towards flux continuity is studied. Varied HRTs of contact tank in range of 1 to 3 hrs with an half hour increment was performed simultaneously in both reactor for optimum decolorization at constant HRT of anoxic and stabilization tanks i.e. each 4 hrs, It shown that the aeration of the incoming feed between 0.7-1 bar into the membrane combined with fitration and backwash time from 3 hrs-1 min to 1 hr-1 min arrangement allowed to the stable permeate flux. Meanwhile 2 hrs was optimum of the contact hydraulic retention time with 53% and 65% for color - and organics removal and 2.5 hrs was that of the second mode with 57% and 59% for color - and organics removal. Introduction of aeration on membrane feed increased attached biomass on membrane surface, that the aerobic microorganism growth shall utilize the co-substrate lead to increase membrane bioreactor performance. EPSp (protein) presumed played a role on membrane fouling in MBR.

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