Dynamic interaction mechanism of environment, microorganisms, and functions in anaerobic digestion of food waste with magnetic powder supplement

Gao, Mingxue; Song, Jinghui; Wang, Ying; Zhang, Siqi; Sheng, Chenjing; Shang, Zheming; Yang, Gaihe; Wang, Xiaojiao; Feng, Yongzhong

doi:10.1016/j.biortech.2021.125656

Cited by 17 publications

(4 citation statements)

References 30 publications

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“…Second, irritating magnetic substances were added upon the modification. Moreover, this result was different from the previous studies on the AD metabolic pathways with magnet powder addition (Gao et al, 2021). This further illustrated that the internal mechanisms of the different additives for increasing the AD methane production were different.…”

Section: Discussioncontrasting

confidence: 99%

Magnetic biochar affects the metabolic pathway in methanogenesis of anaerobic digestion of food waste

Gao

Zhi

et al. 2022

GCB Bioenergy

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To alleviate pollution and promote clean energy production, food waste can be used to produce methane through anaerobic digestion (AD). In this study, wheat straw was used to produce biochar (BC) and magnetic biochar (MB) as additives for AD of food waste. MB2.5% and BC2.5% led to the highest methane production. The main action mechanism of the additives in AD was the change in environmental factors upon stimulating microorganisms to rapidly metabolize volatile fatty acids. The stimulation of microbial function increased the abundance of the methanogenesis pathways. Methanosarcina was the most dominant archaea in the four methanogenesis modules, and the microbial community changed more clearly with time than with treatment. This study is innovative in finding the effectiveness of BC and MB treatments attributed to the abundance of methanogenesis modules, especially MB2.5% treatment retained its advantage until the later stage of digestion in AD process.

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Section: Discussioncontrasting

confidence: 99%

Magnetic biochar affects the metabolic pathway in methanogenesis of anaerobic digestion of food waste

Gao

Zhi

et al. 2022

GCB Bioenergy

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“…Typically, the pathway of organic matter degradation to methane by methanogenesis is divided into four metabolic modules: acetic acid→CH 4 (M00357), methylamine/dimethylamine/trimethylamine→CH 4 (M00563), CO 2 →CH 4 (M00567), and methanol→CH 4 (M00356) ( Gao et al, 2021 ). The addition of carbon-based conductive materials in this experiment enhances the methanogenic pathway of food waste digester and promotes the enrichment of synthetic VFAs-oxidizing bacteria and DIET-related microorganisms, further stimulating hydrogenotrophic and acetoclastic methanogens metabolism in the anaerobic system ( Yan and Wang, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…In this experiment, five basic metabolic modules for microbial viability maintenance and one riboflavin metabolic module were selected as the main comparators of microbial metabolic activity in decentralized food waste treatment units ( Gao et al, 2021 ). The selected metabolic modules were reduced citric acid cycle (M00173), citric acid TCA cycle (M00009), glycolytic pathway (M00001), citric acid cycle II (M00011), inosine monophosphate biosynthesis (M00048), and riboflavin biosynthesis (M00125).…”

Section: Resultsmentioning

confidence: 99%

Riboflavin modified carbon cloth enhances anaerobic digestion treating food waste in a pilot-scale system

Li,

Huang,

et al. 2024

Front. Bioeng. Biotechnol.

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Previous laboratory-scale studies have consistently shown that carbon-based conductive materials can notably improve the anaerobic digestion of food waste, typically employing reactors with regular capacity of 1–20 L. Furthermore, incorporating riboflavin-loaded conductive materials can further address the imbalance between fermentation and methanogenesis in anaerobic systems. However, there have been few reports on pilot-scale investigation. In this study, a 10 m2 of riboflavin modified carbon cloth was incorporated into a pilot-scale (2 m3) food waste anaerobic reactor to improve its treatment efficiency. The study found that the addition of riboflavin-loaded carbon cloth can increase the maximum organic loading rate (OLR) by 40% of the pilot-scale reactor, compared to the system using carbon cloth without riboflavin loading, while ensuring efficient operation of the reaction system, effectively alleviating system acidification, sustaining methanogen activity, and increasing daily methane production by 25%. Analysis of the microbial community structure revealed that riboflavin-loaded carbon cloth enriched the methanogenic archaea in the genera of Methanothrix and Methanobacterium, which are capable of extracellular direct interspecies electron transfer (DIET). And metabolic pathway analysis identified the methane production pathway, highly enriched on the reduction of acetic acid and CO2 at riboflavin-loaded carbon cloth sample. The expression levels of genes related to methane production via DIET pathway were also significantly upregulated. These results can provide important guidance for the practical application of food waste anaerobic digestion engineering.

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“…Food waste is generated by almost every person on earth on a daily basis, an annual output of 1.3 billion tons, which accounts for almost 1/3 of the urban waste. , Food waste contains nutrients and generally abundant moisture, serving as a culture medium for microorganisms, which creates unpleasant odors and other environmental issues. , Direct disposal of food waste is a waste of chemical energy and material value, as food waste is a carbonaceous material. It can be further utilized as a feedstock for production of fuel and functional materials via thermochemical routes such as hydrothermal carbonization (HTC), , pyrolysis, , activation, , etc.…”

Section: Introductionmentioning

confidence: 99%

Involvement of Cooking Oils in Hydrothermal Carbonization of Food Waste

Lin

Jiang

et al. 2023

ACS Food Sci. Technol.

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The fatty esters in cooking oil may not be inert organics. Their potential involvement in hydrothermal carbonization (HTC) of food waste was investigated in this study. Cooked cabbage (vegetable) and rice (staple food) were selected as the feedstock and their HTC in the presence of (vegetable oil) and lard (animal fat) was conducted at 260 °C for 10 h. The results indicated that presence of the cooking oil increased the hydrochar yield (i.e., 71.5% increase for HTC of rice with lard) originating from the reactions between the oil-derived fatty acids and the food-derived alcohols, amines, etc. This significantly increased both the carbon and hydrogen contents and simultaneously reduced the oxygen content of the hydrochar. The additional aliphatics from the cooking oil formed on hydrochar remarkably reduced the thermal stability of the hydrochar, but increased the volatility and led to improved combustion performance through lowering the activation energy for combustion.

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Dynamic interaction mechanism of environment, microorganisms, and functions in anaerobic digestion of food waste with magnetic powder supplement

Cited by 17 publications

References 30 publications

Magnetic biochar affects the metabolic pathway in methanogenesis of anaerobic digestion of food waste

Magnetic biochar affects the metabolic pathway in methanogenesis of anaerobic digestion of food waste

Riboflavin modified carbon cloth enhances anaerobic digestion treating food waste in a pilot-scale system

Involvement of Cooking Oils in Hydrothermal Carbonization of Food Waste

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