Journal
WATER RESEARCH
Volume 119, Issue -, Pages 150-159Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2017.04.050
Keywords
Biochar; Caproate; Electron efficiency; Extracellular polymer substances (EPS); Microbial network; Methanogens
Funding
- National Natural Science Foundation of China [51622809, 51378375]
- Fundamental Research Funds for Central Universities [04002-19341]
- Collaborative Innovation Center for Regional Environmental Quality
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In this study, biochar was introduced into a chain elongation system to enhance the bioproduction of caproate and caprylate. The concentration of caproate increased to 21.1 g/L upon the addition of biochar, which is the highest level of caproate reported for such a system to date when ethanol was used as electron donor. The addition of biochar created a tougher system with more stable microorganism community structure for chain elongation, in which no obvious inhibition by products or substrates was observed, moreover, the lag phase was reduced 2.3-fold compared to the system without biochar. These reinforcement effect of biochar are attributed to the enhanced conductivity due to the significant enrichment of functional microorganisms via the microbial network surrounding smaller biochar particles, and via the adsorption on the rough surfaces or pores of larger particles, which facilitated electron transfer. Higher amounts of extracellular polymer substances and higher conductivity induced by biochar could contribute to the reinforcement effect in chain elongation. (C) 2017 Elsevier Ltd. All rights reserved.
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