Recent advances in conductive materials amended anaerobic co-digestion of food waste and municipal organic solid waste: Roles, mechanisms, and potential application

Liang, Jialin; Luo, Liwen; Wong, Jonathan W C; He, Di

doi:10.1016/j.biortech.2022.127613

Cited by 26 publications

(2 citation statements)

References 115 publications

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“…This indicates that the introduction of CMs positively Compared to the AD control group, AD-CM exhibited a significant improvement (p < 0.05) in cumulative methane production (Figure 3b), rising from a total methane production of 113.1 to 199.6 mL/gVSS. This indicates that the introduction of CMs positively influenced the methanogenic process, aligning with findings from prior studies [27]. Importantly, the cumulative methane production of AD-MEC, reaching 281.6 mL/gVSS, surpassed both AD and AD-CM (p < 0.05).…”

Section: Methanogenic Performancesupporting

confidence: 88%

Enhanced Methanogenesis of Waste-Activated Sludge (WAS) in a Continuous Stirring Tank Reactor with Stealth Electrodes

He,

Zhang,

Zhang

et al. 2024

Fermentation

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The integration of a microbial electrolysis cell (MEC) is an effective strategy for enhancing the efficiency and stability of an anaerobic digestion (AD) system for energy recovery from waste-activated sludge (WAS). Typically, electrodes are arranged as separate components, potentially disrupting mixing and complicating the reactor configuration, posing challenges for the scaling up of AD-MEC coupling systems. In this study, electrodes were introduced into a continuous stirring tank reactor (CSTR) in a “stealth” manner by integrating them with the inner wall and stirring paddle. This electrode arrangement approach was validated through a sequential batch digestion experiment, resulting in a remarkable 1.5-fold increase in cumulative methane production and a shortened lag period compared to the traditional CSTR with a nonconductive inner wall and stirring paddle. Both the conductive materials (CMs) employed in the electrodes and the electrochemical processes equally contributed to the observed enhancement effect of the electrodes by regulating the evolution of the microbial community within the electrode biofilms, with a specific emphasis on the enrichment of methanogens (primarily Methanobacterium). This research offers a potential avenue to solve the contradiction between the electrode introduction and the mixing operation in AD-MEC coupling systems and to contribute to its future commercial application.

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Section: Methanogenic Performancesupporting

confidence: 88%

Enhanced Methanogenesis of Waste-Activated Sludge (WAS) in a Continuous Stirring Tank Reactor with Stealth Electrodes

He,

Zhang,

Zhang

et al. 2024

Fermentation

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“…As a sustainable technology, anaerobic digestion can effectively reduce the volume of food waste, stabilize organics, and eliminate pathogens . In addition, anaerobic digestion is considered to have the potential to reduce the risk of transmission of antibiotic resistance genes (ARGs) in food waste. , However, anaerobic digestion of food waste easily encounters technical issues such as the accumulation of volatile fatty acids (VFAs) and ammonia inhibition owing to the unbalanced C/N ratio and trace metal deficiency of food waste. − Among the four stages of anaerobic digestion (i.e., hydrolysis, acidogenesis, acetogenesis, and methanogenesis), hydrolysis is the main rate-limiting step while methanogensis is the decisive step that is directly related to final methane production and sensitive to adverse factors such as temperature, pH, and toxicants. − Researchers have devised a number of physical, chemical, and biological techniques to accelerate hydrolysis and optimize the methanogensis to increase the production of methane from food waste. − However, most of them mainly focused on improving the biotransformations of proteins, polysaccharide, and lipids in food waste. − None of the previous reviews addressed the interaction between anaerobic digestion and food additives that often accumulate in large quantities in food waste, mainly including salt, capsaicin, allicin, allyl isothiocyanate (AITC), monosodium glutamate (MSG), and nonnutritive sweeteners (NNS). − This situation hides the details of what is happening in the anaerobic digestion of food waste in the real world, which is not conducive to the deep control and regulation of the anaerobic digestion system.…”

Section: Introductionmentioning

confidence: 99%

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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Recycling of Organic Wastes by Anaerobic Microbial Community

Vibhute,

Borse

2024

Microorganisms for Sustainability

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Recent advances in conductive materials amended anaerobic co-digestion of food waste and municipal organic solid waste: Roles, mechanisms, and potential application

Cited by 26 publications

References 115 publications

Enhanced Methanogenesis of Waste-Activated Sludge (WAS) in a Continuous Stirring Tank Reactor with Stealth Electrodes

Enhanced Methanogenesis of Waste-Activated Sludge (WAS) in a Continuous Stirring Tank Reactor with Stealth Electrodes

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

Recycling of Organic Wastes by Anaerobic Microbial Community

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