Effect of inoculum concentration on methanogenesis by direct interspecies electron transfer: Performance and microbial community composition

Kang, Hye Won; Lee, Sang Hoon; Lim, Tae Guen; Park, Hee Deung

doi:10.1016/j.biortech.2019.121881

Cited by 26 publications

(3 citation statements)

References 34 publications

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“…Improved lipid degradation to methane is accompanied by the enrichment of fermentative bacteria (such as Synergistes and Geobacter ) and methanogenic archaea (such as Methanolinea and Methanosaeta ) that could possibly establish syntrophic relationships in the presence of GAC (Figures 6 and 7). Kang et al (2019) also reported that GAC significantly enriched Geobacter species. Bioaugmentation of syntrophic microorganisms such as Geobacter and Synergistes identified in this study could be evaluated in future studies on enhanced AD process performance (Zhang et al, 2018).…”

Section: Discussionmentioning

confidence: 92%

Enhanced anaerobic digestion of dairy wastewater in a granular activated carbon amended sequential batch reactor

et al. 2022

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This study investigated the potential of granular activated carbon (GAC) supplementation to enhance anaerobic degradation of dairy wastewater. Two sequential batch reactors (SBRs; 0.8 L working volume), one control and another amended with GAC, were operated at 37°C and 1.5–1.6 m/h upflow velocity for a total of 120 days (four cycles of 30 days each). The methane production at the end of each cycle run increased by about 68%, 503%, 110%, and 125% in the GAC‐amended SBR, compared with the Control SBR. Lipid degradation was faster in the presence of GAC. Conversely, the organic compounds, especially lipids, accumulated in the absence of the conductive material. In addition, a reduction in lag phase duration by 46%–100% was observed at all four cycles in the GAC‐amended SBR. The peak methane yield rate was at least 2 folds higher with GAC addition in all cycles. RNA‐based bacterial analysis revealed enrichment of Synergistes (0.8% to 29.2%) and Geobacter (0.4% to 11.3%) in the GAC‐amended SBR. Methanolinea (85.8%) was the dominant archaea in the biofilm grown on GAC, followed by Methanosaeta (11.3%), at RNA level. Overall, this study revealed that GAC supplementation in anaerobic digesters treating dairy wastewater can promote stable and efficient methane production, accelerate lipid degradation and might promote the activity of electroactive microorganisms.

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Section: Discussionmentioning

confidence: 92%

Enhanced anaerobic digestion of dairy wastewater in a granular activated carbon amended sequential batch reactor

et al. 2022

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“…The studies about the effect of GAC on methanogenesis are not exactly the same, and the optimal dose of GAC is still unclear. Kang et al showed the cumulative methane production between the GAC and control reactors with no difference [57]. Some studies reversely showed inhibition effects of GAC on AD performance with up to 30% decrease of methane production [72,99,100].…”

Section: Disadvantages Of Gac On Methanogenesismentioning

confidence: 99%

“…However, the detailed mechanism of DIET is still ambiguous [20,22]. Kang et al showed that the effect of GAC on AD performance is independent of the inocula composition, and GAC promoted biomethane production through enrichment of DIET-related bacteria and methanogens on its surface [56,57]. Zhang et al observed a 20% increase in methane production by GAC addition in up-flow anaerobic sludge blankets [58].…”

Section: Promoting Interspecies Electron Transfer Efficiencymentioning

confidence: 99%