TITLE:
Comparison of ASBR and CSTR reactor for hydrogen production from palm oil mill effluent under thermophilic condition
AUTHORS:
Jiravut Seengenyoung, Sompong O-Thong, Poonsuk Prasertsan
KEYWORDS:
Thermoanaerobacterium thermosaccharolyticum PSU-2; Hydrogen Production; Palm Oil Mill Effluent; Thermophilic Fermentation
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.5 No.3,
January
29,
2014
ABSTRACT: Hydrogen production from palm oil mill effluent
(POME) by Thermoanaerobacterium thermosaccharolyticum PSU-2 was
investigated both in batch and continuous reactors using anaerobic sequencing
batch reactor (ASBR) and continuous stirred tank reactor (CSTR). The hydrogen
production determined from batch experiment of POME at an inoculum size of 0%,
10%, 20% and 30% (v/v) was 161, 201, 246 and 296 mL H2/g-COD with
COD removal efficiency of 21%, 23%, 23% and 23%, respectively. Continuous
hydrogen production was start-up with 30% (v/v) inoculum in both ASBR and CSTR
reactors and more than 30% COD removal could be obtained at HRT of 4 days,
corresponding to OLR of 11.3 g COD/ L·day.
Similar hydrogen production rates of 2.05 and2.16 LH2/L. day
were obtained from ASBR and CSTR, respectively. COD removal efficiency of ASBR
was 37.7%, while it was 44.8% for CSTR. However, ASBR was stable in term of
alkalinity, while the CSTR was stable in term of hydrogen production, soluble
metabolites concentration and alkalinity. Therefore, the CSTR was found to be
more stable in hydrogen production than ASBR under the same OLR.