A Hybrid Activated Sludge-Moving Bed Biofilm Reactor System for the Treatment of Petroleum Refinery Effluents
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Abstract
A novel hybrid biological treatment system was developed to enhance the efficacy of effluent from petroleum refineries, as demonstrated in this experimental study. In the proposed pilot system, activated sludge is mixed with a sand filtering unit and a moving bed biofilm reactor (MBBR). There was a mix of attached and suspended microbes in the hybrid reactor, which consisted of an aeration tank containing activated sludge and polyurethane biofilm carriers. Shahid Tondgooyan Oil Refining Company's dissolved air flotation (DAF) discharged water was used to collect the influent wastewater. Researchers looked into how treatment efficacy was correlated with carrier mixing intensity and hydraulic retention time (HRT). Quantities of total dissolved solids (TDS), dissolved oxygen (DO), pH, total suspended solids (TSS), turbidity (TU), chemical oxygen demand (COD), biochemical oxygen demand (BOD5), and ammonia (NH3) were among the water quality metrics examined.
The results demonstrated that expanding the HRT length to 6 to 9 hours and increasing the carrier mixing intensity to a moderate range improved the system's carrier mixing intensity. The COD, NH 3, TSS, BOD 5, TU, and TDS removal efficiencies were approximately 98.6, 97.1, 82.4, 99.2, 98.7, 15.1 and 99.4 percent, respectively, when working circumstances were good. In contrast, increasing the mixing intensity to even higher levels reduced treatment efficiency slightly, probably due to biofilm dissociation and decreased microbial stability. Following a 9-hour HRT and a medium carrier mixing regime, the optimal operating conditions were identified. The major reason for this was the inclusion of the sand filtering unit, which greatly improved the effectiveness of turbidity removal. It appears that the hybrid system of sludge-MBBR-sand filter might be utilized to treat effluent from petroleum refineries, as it outperformed conventional biological treatment methods in eliminating a variety of contaminants.
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