Title of Paper:Stimulation of methanogenesis in anaerobic digesters treating leachate from a municipal solid waste incineration plant with carbon cloth

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Date of Publication:2016-12-01

Journal:BIORESOURCE TECHNOLOGY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:222

Page Number:270-276

ISSN No.:0960-8524

Key Words:Incineration leachate; Direct interspecies electron transfer; Carbon cloth; Methanogenesis; Extracellular electron transfer

Abstract: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.