Abstract:
This research aims to study the treatability of organic substances and reactive dye in an immobilizedcell-sequencing batch reactor (SBR). Three different supporting media namely, activated carbon,steel slag and plastic were used. The performance of each reactor was compared with a conventionalSBR. A simulated textile wastewater containing a reactive azo dye (Procion Red E-7B) at aconcentration of 40 mg/L and COD of 300 mg/L, was fed into each reactor. The SBR operationconsists of 5 periods, Fill 1.5 h, React(anoxic:oxic) 20(14:6) h, Settle 1.5 h, Draw 0.5 h and Idle0.5 h. The removal efficiencies of COD and dye on the various solid retention times (SRTs) of 3, 7,12 and 22 days were investigated. Results revealed that the overall COD removal efficiencies of allthe experimental SBRs were in the vicinity of 82.44-90.31%. However, removal of dye wasimproved at long SRT of 22 days, especially for the SBRs containing activated carbon and steelslag. This indicates that the amounts of both suspended and attached biomass were influenced ondecolorization efficiency. Investigations of COD and color removal during 1-cycle of operationrevealed that organic substances removal was found at all periods of the SBR cycle, whereas the dyeremoval found in fill period during anoxic operation. The lengthen of anoxic operation from 14 to17.5 h in fill period could enhanced the COD and dye removal efficiencies to 89.87-91.10% and 27.00-32.44%, respectively.