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PERFORMANCE CHANGES OF AEROBIC- ANOXIC MEMBRANE BIOREACTOR FOR AZO DYE BIODEGRADATION UNDER DIFFERENT HYDRAULIC RETENTION TIME IN ANOXIC
Get PDFThis research investigated the changes in anoxic-oxic membrane bioreactor (AOMBR) performance caused by various hydraulic retention time (HRT) of anoxic tank for Remazol Black-5 azo dye biodegradation. Bioreactor consists of anoxic tank coupled with modified activated sludge process, contact stabiliation process combined with an external ultrafiltration membrane. Feed was a mixture of Remazol Black-5 at a concentration of 110-120 mg / L and tempe industry wastewater. The hydraulic retention time of anoxic tank was varried in 3, 3½, 4, 4½, 5, 5½ and 6 hours respectively at constant HRT of contact-, and stabilization tanks ie 2, and 4 hours. The optimum color- and COD removal were obtained at 4 h HRT of the anoxic tank i.e. 77% and 76% on 2 days solid retention time (SRT). The anoxic tank contributed to the highest color- and COD removal of the entirely removal, followed by the stabilization tank. Membrane contributed significant only in color removal of AOMBR performance due to its anoxic microenvironment inside the flocs attached to the membrane. The aerobic condition in contact and stabilization tanks led to high organics removal used microorganisms growth. KEY WORDS: Aerobic-Anoxic Membrane Bioreactor (AOMBR), azo dye, Hydraulic Retention Time (HRT), biodegradatio
