Analysing the mechanism of food waste anaerobic digestion enhanced by iron oxide in a continuous two-stage process

Yuan, Tugui; Sun, Ran; Miao, Qianming; Wang, Xue; Xu, Qiyong

doi:10.1016/j.wasman.2023.10.009

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…This stimulatory effect may be ascribed to the establishment of DIET between G. grbiciae and M. barkeri 800 with conductive particle materials acting as electron conduits. Previous studies on DIET have indicated that some (semi) conductive materials (including magnetite, carbon cloth, GAC, and biochar) can accelerate the direct electron transfer between microbes [7,10,13,[18][19][20][21][22][23][24][25][26][27]34,35]. Methane was generated at a faster rate and higher levels in co-cultures supplemented with GAC than in co-cultures supplemented with magnetite during the early growth phase.…”

Section: Discussionmentioning

confidence: 97%

“…Subsequently, various co-cultures that exchange electrons through DIET have been reported [5,[12][13][14][15][16][17][18] and primarily involve Geobacter species and methanogens. Moreover, the effects of various conductive materials on DIET have also been reported [7,10,[18][19][20][21][22][23][24][25][26][27]. The continuing increase in the number of microbes identified to carry out electron exchange through DIET indicates that DIET is a syntrophic metabolism that is more prevalent in nature than previously thought.…”

Section: Introductionmentioning

confidence: 90%

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Geobacter grbiciae—A New Electron Donor in the Formation of Co-Cultures via Direct Interspecies Electron Transfer

Deng,

Wang,

et al. 2023

Microbiology Research

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Geobacter grbiciae can grow via coupling oxidation of ethanol to the reduction of various forms of soluble Fe(III) and poorly crystalline Fe(III) oxide, suggesting that G. grbiciae can act as an electron-donor microbe for forming co-cultures through direct interspecies electron transfer (DIET). In this report, potential co-cultures through DIET of G. grbiciae and Methanosarcina barkeri 800, G. sulfurreducens Δhyb, or Methanospirillum hungatei, as electron-acceptor microbes, were examined. Co-cultures of G. grbiciae and G. sulfurreducens Δhyb were performed with ethanol as the sole electron-donor substance and fumarate as the electron-acceptor substance in the presence of granular activated carbon (GAC), magnetite, or polyester felt. The conditions for co-culturing G. grbiciae and M. barkeri 800 (or M. hungatei) were the same as those for G. grbiciae and G. sulfurreducens Δhyb, except fumarate was absent and different cultivation temperatures were used. All co-cultures were anaerobically cultivated. Samples were regularly withdrawn from the co-cultures to monitor methane, fumarate, and succinate via gas or high-performance liquid chromatography. G. grbiciae formed functional co-cultures with M. barkeri 800 in the presence of GAC or magnetite. No co-culture of G. grbiciae with the H2/formate-utilizing methanogen M. hungatei was observed. Additionally, G. grbiciae formed functional co-cultures with H2/formate-un-utilizing G. sulfurreducens Δhyb without the GAC or magnetite supplement. These findings indicate electron transfer between G. grbiciae and M. barkeri 800/G. sulfurreducens Δhyb is via DIET rather than H2/formate, confirming that G. grbiciae acts as an electron-donor microbe. Although the co-cultures of G. grbiciae and M. barkeri 800 syntrophically converted ethanol to methane through DIET, the conversion of propionate or butyrate to methane was not observed. These findings expand the range of microbes that can act as electron donors for interaction with other microbes through DIET. However, propionate and butyrate metabolism through DIET in mixed microbial communities with methane as a product requires further analysis. This study provides a framework for finding new electron-donor microbes.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 90%

Geobacter grbiciae—A New Electron Donor in the Formation of Co-Cultures via Direct Interspecies Electron Transfer

Deng,

Wang,

et al. 2023

Microbiology Research

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“…The direct addition of micro-nutrients to prevent failure from high VFAs or ammonia concentrations has also been identified as a promising strategy [20]. For example, the addition of iron oxide was shown to enhance the anaerobic digestion of food waste [21]. However, none of these strategies have been demonstrated to completely mitigate the limitations faced by the AD of FW, and more research is needed to improve the profitability of the process [7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

Tanguay-Rioux,

Spreutels,

Roy

et al. 2023

Bioengineering

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Anaerobic digestion of food waste still faces important challenges despite its world-wide application. An important fraction of food waste is composed of organic material having a low hydrolysis rate and which is often not degraded in digesters. The addition of this less hydrolysable fraction into anaerobic digesters requires a longer hydraulic residence time, and therefore leads to oversizing of the digesters. To overcome this problem, the conversion of the highly biodegradable liquid fraction from fruit and vegetable waste in a up-flow anaerobic sludge blanket (UASB) digester is proposed and demonstrated. The more easily biodegradable fraction of the waste is concentrated in the liquid phase using a 2-stage screw press separation. Then, this liquid fraction is digested in a 3.5 L UASB digester at a high organic loading rate. A good and stable performance was observed up to an organic loading rate (OLR) of 12 g COD/(Lrx.d), with a specific methane production of 2.6 L CH4/(Lrx.d) and a degradation of 85% of the initial total COD. Compared to the conversion of the same initial waste with a continuously stirred tank reactor (CSTR), this new treatment strategy leads to 10% lower COD degradation, but can produce the same amount of methane with a digester that is twice as small. The scale-up of this process could contribute to reduced costs related to the anaerobic digestion of food waste, while reducing management efforts associated with digestate handling and increasing process stability at high organic loading rates.

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Impact and migration behavior of triclosan on waste-activated sludge anaerobic digestion

Cui,

Chen,

Sangeetha

et al. 2024

Bioresource Technology

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Analysing the mechanism of food waste anaerobic digestion enhanced by iron oxide in a continuous two-stage process

Cited by 6 publications

References 38 publications

Geobacter grbiciae—A New Electron Donor in the Formation of Co-Cultures via Direct Interspecies Electron Transfer

Geobacter grbiciae—A New Electron Donor in the Formation of Co-Cultures via Direct Interspecies Electron Transfer

Assessment of the Feasibility of Converting the Liquid Fraction Separated from Fruit and Vegetable Waste in a UASB Digester

Impact and migration behavior of triclosan on waste-activated sludge anaerobic digestion

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