数字农科院2.0

Sulfurized nano zero-valent iron loaded graphene oxide enhances the anaerobic fermentation treatment of swine manure: Insights from microbial community analysis and DFT calculations

文献类型： 外文期刊

作者： Min Zhang;Qilan Huang;Haiyun Liu;Haibin Fu;Liu Cao;Huanhuan Wei;Renjiao Yan;Wenqi Wang;Kunjian Zhang;Qianru Zhang

作者机构：

关键词： Acetic acid;Anaerobic fermentation;Graphene oxide;Microbial community;Sulfide nano-ZVI

期刊名称： Journal of Environmental Management

ISSN： 0301-4797

年卷期： 2025 年 394 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： To enhance anaerobic treatment of livestock and poultry waste, the integration of nano-zero-valent iron and graphene oxide has been explored, given their individual limitations. This study introduced a vulcanization-modified nZVI supported on GO (S-nZVI@GO), aiming to augment reactivity in pig manure treatment. The removal rate of COD (74.00 %) and methane production (104.92 mL/g VS) were improved significantly by employing S-nZVI@GO with S/Fe = 0.04:1 and GO/S-nZVI = 0.08:1. Due to the presence of Firmicutes and Bacteroidetes bacteria and S-nZVI@GO with the change of pH, the yield of acetic acid was increased, which optimized the anaerobic fermentation with pig manure as substrate. Microbial community characteristics indicate that a high GO/S-nZVI mass ratio favors an increase in methanogen abundance, with Methanosarcina in Halobacterota exhibiting the highest abundance increase of 18.10 %, stable microbial symbiotic metabolism promote the anaerobic fermentation of pig manure. In conjunction with density functional theory computations, this study has, for the first time, elucidated the two principal routes by which S-nZVI@GO contributes to methane generation within anaerobic fermentation systems: the first entails the conversion of monosaccharides into glyceraldehyde, which is subsequently isomerized into lactic acid, ultimately yielding acetic acid and CO2; the second involves the transformation of monosaccharides into glycolaldehyde, with the intermediate product directly producing acetic acid. This research provides a theoretical foundation for the modification of iron-based materials and their composite applications with carbon-based matrices, offering significant guidance for optimizing the anaerobic fermentation process in the utilization of livestock and poultry manure resources.

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