Flux Continuity in Membrane Bioreactor for Azo Dye Biodegradation

Komala, Puti Sri and Effendi, Agus Jatnika and Wenten, I.G. and Wisjnuprapto, Wisjnuprapto Flux Continuity in 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. Hydraulic retention time (HRT) of contact, stabilization and anoxic tank are kept in 2, 4 and 3 hours respectively. To obtain the expected HRTs control of the flux stability is required. In this research the performance of two kinds aerobic-anaerobic membrane bioreactor with and without aeration modes on flux continuity is studied. The first mode, air is injected to the feed channels prior discharges into the membrane so that mixed liquor circulates within the bioreactor. In the second mode, the mixed liquor flows only by pump pressure without aeration to feed channels. Flux continuity of the MBRs with and without aeration, backflush effect is evaluated to achieve the required HRT. Both introducing aeration and without aeration on the feed channel of the membrane can keep flux stable by creating wall shear stress and so suppress membrane fouling. However, increasing biomass concentration in bioreactors results in more frequent backwashing, so that aerated MBR is more preferred. Due to changing of permeate rate caused the HRT of stabilization tank changes to 3.98 hrs for non aerated MBR, whereas the HRT of MBR with alternate filtration-backflush time is 4.10 hours.

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