Journal
BIORESOURCE TECHNOLOGY
Volume 222, Issue -, Pages 270-276Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.10.007
Keywords
Incineration leachate; Direct interspecies electron transfer; Carbon cloth; Methanogenesis; Extracellular electron transfer
Funding
- Fundamental Research Funds for the Central Universities [2015ZCQ-HJ-01]
- Beijing Science and Technology Plan Projects (Beijing Science and Technology Commission)
- National Natural Science Foundation of China [51678051]
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Bio-methanogenic digestion of incineration leachate is hindered by high OLRs, which can lead to build-up of VFAs, drops in pH and ultimately in reactor souring. It was hypothesized that incorporation of carbon cloth into reactors treating leachate would promote DIET and enhance reactor performance. To examine this possibility, carbon cloth was added to laboratory-scale UASB reactors that were fed incineration leachate. As expected, the carbon-cloth amended reactor could operate stably with a 34.2% higher OLR than the control (49.4 vs 36.8 kg COD/(m(3) d)). Microbial community analysis showed that bacteria capable of extracellular electron transfer and methanogens known to participate in DIET were enriched on the carbon cloth surface, and conductivity of sludge from the carbon cloth amended reactor was almost twofold higher than sludge from the control (9.77 vs 5.47 mu S/cm), suggesting that microorganisms in the experimental reactor may have been expressing electrically conductive filaments. (C) 2016 Elsevier Ltd. All rights reserved.
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