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Comparative Mesophilic and Thermophilic Anaerobic Digestion of Palm Oil Mill Effluent Using Upflow Anaerobic Sludge Blanket
The effects of organic loading rate and operating temperature on the microbial diversity and performances of upflow anaerobic sludge blanket (UASB) reactors treating palm oil mill effluent (POME) were investigated. The following two UASB reactors were run in parallel for comparison: (1) under a mesophilic condition (37 °C) and (2) under a mesophilic condition in transition to a thermophilic condition (57 °C). A polymerase chain reaction (PCR)‐based denaturing gradient gel electrophoresis (DGGE) analysis showed that the microbial population profiles significantly changed with the organic loading rate (OLR) and the temperature transition from the mesophilic to the thermophilic condition. Significant biomass washout was observed for the mesophilic UASB when operating at a high organic loading rate (OLR) of 9.5 g chemical oxygen demand (COD)/L·d. In contrast, the thermophilic UASB can be operated at this OLR and at a temperature of 57 °C with satisfactory COD removal and biogas production. The PCR‐based DGGE analysis suggested that the thermophilic temperature of 57 °C was suitable for a number of hydrolytic, acidogenic, and acetogenic bacteria.
Comparative Mesophilic and Thermophilic Anaerobic Digestion of Palm Oil Mill Effluent Using Upflow Anaerobic Sludge Blanket
The effects of organic loading rate and operating temperature on the microbial diversity and performances of upflow anaerobic sludge blanket (UASB) reactors treating palm oil mill effluent (POME) were investigated. The following two UASB reactors were run in parallel for comparison: (1) under a mesophilic condition (37 °C) and (2) under a mesophilic condition in transition to a thermophilic condition (57 °C). A polymerase chain reaction (PCR)‐based denaturing gradient gel electrophoresis (DGGE) analysis showed that the microbial population profiles significantly changed with the organic loading rate (OLR) and the temperature transition from the mesophilic to the thermophilic condition. Significant biomass washout was observed for the mesophilic UASB when operating at a high organic loading rate (OLR) of 9.5 g chemical oxygen demand (COD)/L·d. In contrast, the thermophilic UASB can be operated at this OLR and at a temperature of 57 °C with satisfactory COD removal and biogas production. The PCR‐based DGGE analysis suggested that the thermophilic temperature of 57 °C was suitable for a number of hydrolytic, acidogenic, and acetogenic bacteria.
Comparative Mesophilic and Thermophilic Anaerobic Digestion of Palm Oil Mill Effluent Using Upflow Anaerobic Sludge Blanket
Khemkhao, Maneerat (author) / Nuntakumjorn, Boonyarit (author) / Techkarnjanaruk, Somkiet (author) / Phalakornkule, Chantaraporn (author)
Water Environment Research ; 84 ; 577-587
2012-07-01
11 pages
Article (Journal)
Electronic Resource
English
| Taylor & Francis Verlag | 2006
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