期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 73, 期 -, 页码 80-85出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2013.02.004
关键词
Propionate; Fe-0; Acetate; Acetogenesis; Homoacetogenesis; Anaerobic
资金
- National Crucial Research Project for Water Pollution Control of China [2012ZX07202006]
- National Basic Research Program of China [21177015]
- New Century Excellent Talent Program of the Ministry of Education of China [NCET-10-028]
Propionate is an unfavorable substrate for the anaerobic digestion because it is thermodynamically difficult to be decomposed into acetate. An attempt to enhance the decomposition of propionate by adding Fe-0 powder (log) into an acidogenic reactor (A1) with propionate as the sole carbon source was made in this study. The results showed that the propionate conversion rate (67-89%) in A1 were higher than that in a reference reactor (43-77%) without dosing of Fe-0 (A2). The enhanced conversion of propionate caused both chemical oxygen demand removal (COD) (57-79%) and acetate production (178-328 mg/L) in A1 to increase significantly. Although Fe-0 contributed the H-2 production chemically, the H-2 content of A1 was less than that of A2. The reason was ascribed to the enhanced utilization of H-2 for the homoacetogenesis. It was calculated that the Gibbs free energy in the decomposition of propionate was decreased by about 8.0-10.2% with the dosing of Fe-0. Also, the activities of enzymes related to the acetogenesis were enhanced by 2-34-folds. Fluorescence in situ hybridization (FISH) and denaturing gradient gel electrophoresis (DGGE) analysis indicated that Fe-0 increased the abundance of microbial communities, especially propionate-utilizing bacteria and homoacetogenic bacteria. (C) 2013 Elsevier B.V. All rights reserved.
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