Leong, Hoong Sum (2018) Treatment of palm oil mill effluent using hybrid anaerobic membrane bioreactor at different temperatures and pH values. Final Year Project, UTAR.
Abstract
Membrane fouling is considered as the major impediment to the widespread application of the membrane bioreactor (MBR) system as it affects the operating conditions, cost and performance of the whole system. In order to increase membrane fouling resistance within the system, performance of the anaerobic membrane bioreactor (AnMBR) system operated under different operational temperatures and pH values were assessed. The AnMBR which operated under thermophilic condition, 55 °C showed the highest COD removal efficiency which was 76.21 % ± 4.54 % compared to others AnMBRs operated under mesophilic condition. A suitable increment of operational temperature could accelerate hydrolysis of cellulose and hemicellulose into comparatively biodegradable components. The performance of the AnMBRs with controlled pH around 6.7 which is proved as the optimum pH for anaerobic digestion. However this study showed no significant improvement in terms of COD removal efficiency. This may be due to the increased pressure within the bioreactors after an unexpected production of foam clogging the biogas outlets. In this study, the integration of microbial fuel cell (MFC) into the AnMBRs did not contribute much improvement but showed declination in terms of COD removal efficiency and membrane fouling control. The declination of the performance of the combined system was due to the sensitivity of anaerobic microorganisms to the environmental conditions such as the change in feedstock from raw POME to the supernatant of MFC. The performance of MFC-AnMBRs may be affected during this period as the stability of the microbes community is yet achieved.
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