3.1.2. Steady state operation and biological efficiency Throughout the operation, no consequential variance in the pH (7.5–8.5) and temperature (18–23 °c) were observed. The uninterrupted operation time began at an MLSS concentration of 6.6 g/L Fig. 5. Turbidity (visual) comparison of treated wastewater and raw wastewater.(day 60) which was stable for the whole period of the experiment(day 60–120). This has been interpreted as a sign of the reduced biomass in the MBR systems. The minor change in the temperature throughout the operation was because of the significant level of ambient air that was pumping into the system and their temperature changes during the experiment. The effluent quality throughout the operation was regularly checked. The operation conditions and the monitoring were separated into three time periods: days 0–25, 25–45, and 45–60 (see Table 3).The result shows that the mean removal of COD throughout the operation was in the range of 76–82%. The reported COD elimination in MBR studies is usually high (>99%).The proportionately lower COD elimination in this study is linked to the high feed concentration as well as the presence of troublesome biodegradable, rebellious organics and growth restrainingmaterials in the actual refinery wastewater. An even lower biodegradation (<41%) was reported by Satyawali and Balakrishnan for treating of molasses of distillery wastewater. It must be noted that their influent COD concentration was higher too.A nearly perfect SS preservation was achieved throughout the MBR operation, as anticipated. It had been apparent that the forming of a cake layer on the membrane area controlled the SS preservation by creating a dynamic membrane.3.2. The COD and BOD5 elimination in the HF-MBR processAt the beginning (the habituation period), COD and BOD5 elimination performance by the HF-MBR was proportionately minimal, and this was because of inadequate biomass growth in the process. The highest COD and BOD5 elimination was acquired during the 60–85 day, which is about 81–82% removal. The percentage of COD and BOD5 removal during the operation time are shown in Fig. 3a and b. Nevertheless, the concentration of COD and BOD5 was reached to a good low level in the effluent. These results were in line with result of other researcher. Barrios-Martinez et al., Pollice et al., Duk Zoh et al. were achieved result similar to our results.
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