Revealing the methanogenic pathways for anaerobic digestion of key components in food waste: Performance, microbial community, and implications

Yang, Shuxu; Xue, Weiqi; Liu, Pingbo; Lu, Xiejuan; Wu, Xiaohui; Sun, Linquan; Zan, Feixiang

doi:10.1016/j.biortech.2021.126340

Cited by 38 publications

(7 citation statements)

References 30 publications

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“…This suggests that the enrichment of Methanobrevibacter and Methanosphaera may have a mitigating effect on the inhibition of methane production by capsaicin. The decreased abundance of Methanobacterium , a hydrogenotrophic methanogen, was quite consistent with the result in section showing that acetotrophic methanogenesis was severely inhibited by capsaicin …”

Section: Responses Of the Microbial Community To Food Additives In Fo...supporting

confidence: 89%

“…The decreased abundance of Methanobacterium, a hydrogenotrophic methanogen, was quite consistent with the result in section 3 showing that acetotrophic methanogenesis was severely inhibited by capsaicin. 93 At the phylum level, the addition of allicin increased the relative abundance of Chloroflexi and Firmicutes from 11.98% and 7.31% in the blank to 15.61% and 11.17%, respectively, while the abundance of Acidobacteria remarkably decreased from 24.45% to 16.98%. Firmicutes and Chloroflexi were reported to be able to degrade a large number of organic compounds under various conditions.…”

Section: Responses Of the Microbial Community To Food Additives In Fo...mentioning

confidence: 92%

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Insights into the Occurrence, Fate, Impacts, and Control of Food Additives in Food Waste Anaerobic Digestion: A Review

Long

Liu

et al. 2023

Environ. Sci. Technol.

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The recovery of biomass energy from food waste through anaerobic digestion as an alternative to fossil energy is of great significance for the development of environmental sustainability and the circular economy. However, a substantial number of food additives (e.g., salt, allicin, capsaicin, allyl isothiocyanate, monosodium glutamate, and nonnutritive sweeteners) are present in food waste, and their interactions with anaerobic digestion might affect energy recovery, which is typically overlooked. This work describes the current understanding of the occurrence and fate of food additives in anaerobic digestion of food waste. The biotransformation pathways of food additives during anaerobic digestion are well discussed. In addition, important discoveries in the effects and underlying mechanisms of food additives on anaerobic digestion are reviewed. The results showed that most of the food additives had negative effects on anaerobic digestion by deactivating functional enzymes, thus inhibiting methane production. By reviewing the response of microbial communities to food additives, we can further improve our understanding of the impact of food additives on anaerobic digestion. Intriguingly, the possibility that food additives may promote the spread of antibiotic resistance genes, and thus threaten ecology and public health, is highlighted. Furthermore, strategies for mitigating the effects of food additives on anaerobic digestion are outlined in terms of optimal operation conditions, effectiveness, and reaction mechanisms, among which chemical methods have been widely used and are effective in promoting the degradation of food additives and increasing methane production. This review aims to advance our understanding of the fate and impact of food additives in anaerobic digestion and to spark novel research ideas for optimizing anaerobic digestion of organic solid waste.

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Section: Responses Of the Microbial Community To Food Additives In Fo...supporting

confidence: 89%

Section: Responses Of the Microbial Community To Food Additives In Fo...mentioning

confidence: 92%

Insights into the Occurrence, Fate, Impacts, and Control of Food Additives in Food Waste Anaerobic Digestion: A Review

Long

Liu

et al. 2023

Environ. Sci. Technol.

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“…As shown in Figure a, Bacteroidota, Firmicutes, Desulfobacterota, Proteobacteria, and Chloroflexi were the dominant phyla in all systems, combined accounting for 77.2–95.0%. It was reported that Proteobacteria, Bacteroidota, Chloroflexi, and Firmicutes were related to organic matter degradation and VFA production , and Desulfobacterota involves sulfate reduction . Thus, the high relative abundance of Firmicutes (63.3%) in TH-AF was associated with the high VFA yield.…”

Section: Resultsmentioning

confidence: 95%

“…It was reported that Proteobacteria, Bacteroidota, Chloroflexi, and Firmicutes were related to organic matter degradation and VFA production 40,41 and Desulfobacterota involves sulfate reduction. 42 Thus, the high relative abundance of Firmicutes (63.3%) in TH-AF was associated with the high VFA yield. Moreover, the relative abundance of Desulfobacterota in the AF and TH-AF system was lower than that in the control and TH systems, which explained the low sulfate reduction in the AF and TH-AF systems.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Co-Metabolic Mechanism Analysis of Sulfidogenesis and Acidogenesis for Mariculture Solid Waste Treatment: Key Functional Microorganisms and Enzymes

Liu,

Deng,

et al. 2023

ACS Sustainable Chem. Eng.

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Sulfidogenesis is a non-negligible process during the acidogenic fermentation of mariculture solid waste (MSW), and its interactions with acidogenesis are still unclear. To fill this gap, this study explored the co-metabolism mechanisms of acidogenesis and sulfidogenesis during the acidogenic fermentation of MSW with thermal (TH) pretreatment, alkaline fermentation (AF), and their combination (TH-AF) pretreatment. The interactions of sulfidogenesis and acidogenesis were altered by the changes in substrate availability and fermentation environment under the intervention of TH and AF pretreatments. Both acidogenesis and sulfidogenesis were boosted with TH pretreatment by supplying adequate substrates, and their competition for substrates was alleviated. Moreover, sulfidogenesis was constrained by 87.3% with TH-AF pretreatment, which reduced volatile fatty acid (VFA) consumption by sulfate reduction bacteria (SRB) and further enhanced the VFA accumulation. Notably, acidogenesis could be promoted by sulfidogenesis due to the enhancement of MSW hydrolysis and enrichment of acidogenic bacteria (Prolixibacter, Ruminococcus, etc.). Different pretreatments could redirect the metabolic pathways by changing the types of key functional microorganisms and enzymes in MSW anaerobic fermentation. Overall, this study provides useful information for developing an efficient and sustainable treatment of MSW.

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“…The WAS was collected from the secondary sedimentation tank of a local domestic wastewater treatment plant (Wuhan, China) using the anaerobic−anoxic− oxic (AAO) process. Synthetic FW was prepared as described in a previous work, 21 consisting of 40% cooked rice, 30% cabbage, 20% banana peel, and 10% pork (based on wet weight). FW was milled to a final particle size smaller than 5 mm by a kitchen blender.…”

Section: Methodsmentioning

confidence: 99%

Deciphering the Role of Conductive Materials in the Interaction between Syntrophic Bacteria and Hydrogenotrophic Methanogens: From Kinetics to Microbial Pathways

et al. 2023

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Conductive materials have been reported to enhance anaerobic digestion (AD) processes, but their role in the synergistic relationship between syntrophic bacteria and hydrogenotrophic methanogens (HMs) remains unclear yet. This study evaluated the holistic impact of conductive materials in an HMsdominant anaerobic system (HMs over 95% in the archaeal community). Biochar (BC) and iron powder (IP) were selected as conductive materials with food waste and waste-activated sludge as co-substrates. The addition of IP and BC to HMs-dominant reactors significantly increased the methane yield (11.5−26%) and shortened the digestion period (32−45%) compared with the control. In addition, a novel developed integrated kinetic model revealed the diauxic peak for methanogenesis which could be significantly alleviated by the mediation of conductive materials. Furthermore, the degradation of volatile fatty acids followed a sequential order of acetate−butyrate−propionate. A smoother degradation was observed with the addition of conductive materials, while the control groups exhibited a 10 day lag phase between the degradation of butyrate and propionate. The microbial community analysis showed that BC and IP stimulated diverse syntrophic bacteria, that is, BC-enriched genus Longilinea and Aminicenantales and IP-accumulated Syntrophomonadaceae. Moreover, IP significantly facilitated HMs enrichment. Overall, this study offers new insights into the regulation of conductive materials on microbial pathways of syntrophic and hydrogenotrophic methanogenesis, with potential implications for the development of sustainable and efficient organic waste treatment strategies.

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Revealing the methanogenic pathways for anaerobic digestion of key components in food waste: Performance, microbial community, and implications

Cited by 38 publications

References 30 publications

Insights into the Occurrence, Fate, Impacts, and Control of Food Additives in Food Waste Anaerobic Digestion: A Review

Insights into the Occurrence, Fate, Impacts, and Control of Food Additives in Food Waste Anaerobic Digestion: A Review

Co-Metabolic Mechanism Analysis of Sulfidogenesis and Acidogenesis for Mariculture Solid Waste Treatment: Key Functional Microorganisms and Enzymes

Deciphering the Role of Conductive Materials in the Interaction between Syntrophic Bacteria and Hydrogenotrophic Methanogens: From Kinetics to Microbial Pathways

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