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Methane Production during Start-Up Phase of Mesophilic Semi-Continues Suspended Growth Anaerobic Digester
1Universiti Sains Malaysia, email@example.com
2Universiti Sains Malaysia, firstname.lastname@example.org
3Universiti Sains Malaysia, email@example.com
4Universiti Sains Malaysia, firstname.lastname@example.org
Citation Information: International Journal of Chemical Reactor Engineering. Volume 8, Issue 1, Pages –, ISSN (Online) 1542-6580, DOI: 10.2202/1542-6580.2034, June 2010
- Published Online:
This study identified the effect and importance of the start-up period on methane production. Methane production was studied during the start-up period of semi-continuous stirred tank reactor (SCSTR) of anaerobic suspended growth under mesophilic conditions (37±3°C) with semi-continuous feeding. Two reactors were seeded with an inoculum of rumen fluid (5% and 10%) and mixed with anaerobic granular sludge (95% and 90%) as a substrate, respectively. The anaerobic digesters were filled up with 800 ml of these seeds during feeding phase. A supernatant of raw Palm oil mill effluent (POME) was fed in semi-continuous mode during the stabilization phase. The pH of the digesters was kept within the range of 7.2 -7.5 without any adjustment during this period. The effects of different concentration of seeding, MLVSS and COD (mg/L) on the quantity of produced methane during the startup period were studied. The results showed that during the feeding phase methane content was 82.10% and 81.34% for both mixtures. But at the end of start-up period both reactors have the same percentage which is around 55%. Higher methane production occurred during the feeding phase for the second mixture. MLVSS and COD concentrations have a direct relationship with the methane obtained.