Potentially shifting from interspecies hydrogen transfer to direct interspecies electron transfer for syntrophic metabolism to resist acidic impact with conductive carbon cloth

Zhao, Zhiqiang; Zhang, Yaobin; Li, Yang; Dang, Yan; Zhu, Tingting; Quan, Xie

doi:10.1016/j.cej.2016.11.149

Cited by 211 publications

(87 citation statements)

References 33 publications

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“…However, DIET enhancement with conductive materials could resist acidic shock. For instance, carbon cloth supplement gave rise to faster butyrate utilization rate in AD of artificial wastewater (1-butanol) (Zhao et al, 2017b). Furthermore, Dang et al (2016) discovered that enriched Sporanaerobacter, Enterococcus, and Methanosarcina species on the surface of carbon cloths resulted in faster system recovery when sour appeared during AD of FW surrogate.…”

Section: Acidic Shock Mitigationmentioning

confidence: 99%

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Liu

et al. 2018

Journal of Cleaner Production

220

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Anaerobic digestion is an effective technology to treat food waste, with methane production as renewable bioenergy. However, there are two key problems in the practical application, i.e., poor system stability and low reactor efficiency. In this paper, additives used in anaerobic digestion of food waste were systematically reviewed in view of system stability and reactor efficiency. Enzymes showed excellent property in food waste pre-hydrolysis stage with almost all macromolecular matters being rapidly resolved. Fungi fermentation process to produce hydrolytic enzymes, can be regarded as a promising and low-cost way to realize rate-limiting step elimination. It can be also concluded that adding neutralizers, buffer chemicals and some other materials is effective to maintain the pH level for practical application. Trace metals in food waste are not enough but needed for methanogens activation in long term and high loading rate operation. In addition, direct interspecies electron transfer could be much helpful for intermediate refractory organic acids degradation and methanogenesis promotion with additives of conductive materials, which is also discussed and should be studied further in anaerobic digestion of food waste. Based on literature review, a new concept is proposed for further study, suggesting that after being well liquefied with enzyme pre-hydrolysis, food waste could be co-digested with landfill leachate in a high-rate anaerobic reactor stably, resulting in a high bioenergy recovery efficiency.

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Section: Acidic Shock Mitigationmentioning

confidence: 99%

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Liu

et al. 2018

Journal of Cleaner Production

220

View full text Add to dashboard Cite

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“…Moreover, the redox environment can greatly influence electron transfer, which has a significant impact on the interspecies interactions in microalgae-bacteria consortium (Logan and Rabaey, 2012). Hence, exogenetic devices such as ''microbial electrochemical systems" and conductive materials (e.g., granular activated carbon) can be appended to the photobioreactor to accelerate the anaerobic metabolic rates (Zhao et al, 2017).…”

Section: Development Of Novel Photobioreactor Configurationsmentioning

confidence: 99%

Advanced nutrient removal from surface water by a consortium of attached microalgae and bacteria: A review

Liu

et al. 2017

Bioresource Technology

270

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“…A recent study has reported that carbon cloth has a beneficial effect on the inhibiting condition caused by the acidic impact and high hydrogen partial pressure in anaerobic digesters [74]. The authors proposed that the dominating electron transfer mechanisms might be shifted toward DIET from IHT in the presence of carbon cloth in a harsh environment such as acidic pH.…”

Section: Carbon Fibersmentioning

confidence: 99%

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

et al. 2018

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Anaerobic digestion (AD) is an effective biological treatment for stabilizing organic compounds in waste/wastewater and in simultaneously producing biogas. However, it is often limited by the slow reaction rates of different microorganisms' syntrophic biological metabolisms. Stable and fast interspecies electron transfer (IET) between volatile fatty acid-oxidizing bacteria and hydrogenotrophic methanogens is crucial for efficient methanogenesis. In this syntrophic interaction, electrons are exchanged via redox mediators such as hydrogen and formate. Recently, direct IET (DIET) has been revealed as an important IET route for AD. Microorganisms undergoing DIET form interspecies electrical connections via membrane-associated cytochromes and conductive pili; thus, redox mediators are not required for electron exchange. This indicates that DIET is more thermodynamically favorable than indirect IET. Recent studies have shown that conductive materials (e.g., iron oxides, activated carbon, biochar, and carbon fibers) can mediate direct electrical connections for DIET. Microorganisms attach to conductive materials' surfaces or vice versa according to particle size, and form conductive biofilms or aggregates. Different conductive materials promote DIET and improve AD performance in digesters treating different feedstocks, potentially suggesting a new approach to enhancing AD performance. This review discusses the role and potential of DIET in methanogenic systems, especially with conductive materials for promoting DIET.

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Potentially shifting from interspecies hydrogen transfer to direct interspecies electron transfer for syntrophic metabolism to resist acidic impact with conductive carbon cloth

Cited by 211 publications

References 33 publications

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Advanced nutrient removal from surface water by a consortium of attached microalgae and bacteria: A review

Role and Potential of Direct Interspecies Electron Transfer in Anaerobic Digestion

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