Hydrogen peroxide-aged biochar mitigating greenhouse gas emissions during co-composting of swine manure with rice bran

文献类型： 外文期刊

第一作者： Chen, Zixun

作者： Chen, Zixun;Gao, Peng;Lu, Yaoxiong;Cui, Xinwei;Peng, Fuyuan

作者机构：

关键词： Composting; Hydrogen peroxide-aged biochar; Greenhouse gas emission; Functional gene; Microbial community

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0269-7491

年卷期： 2025 年 374 卷

页码：

收录情况： SCI

摘要： Compared to fresh biochar, aged biochar has a more significant effect on mitigating greenhouse gas (GHG) emissions in farmland soil. However, there is a relative scarcity of research addressing this effect in aerobic composting. In this study, a co-composting of swine manure and rice bran (NBC), with the addition of fresh biochar (FBC) and hydrogen peroxide-aged biochar (ABC), was conducted to investigate the dynamic changes in physicochemical properties, microbial communities, GHG emissions and related functional genes during different periods. In comparison to NBC, FBC led to a 32 % decrease in total GHG emissions (CO2-equiv), including a 29 % reduction in CO2 emissions, a 45 % reduction in CH4 emissions, and a 35 % decrease in N2O emissions. Furthermore, ABC resulted in a 14 % decrease in GHG emission (CO2-equiv), comprising a 47 % reduction in CH4 emissions and a 23 % decrease in N2O emissions compared to FBC. These findings indicated that the addition of aged biochar has a more significant impact on GHG reduction during composting. Network analyses, Mantel tests and redundancy analyses suggested that the mechanism behind the lowest GHG emissions in ABC is the reduction of the relative abundance of fungi associated with CH4 emissions, along with the nirS and nirK genes associated with denitrification. This reduction is associated with the decreasing anaerobic zones resulting from the increased pore volume in biochar after aging. Overall, this study demonstrates that hydrogen peroxide aging enhances the GHG-reducing efficiency in biochar, and provides new insights into the development of GHG-reducing technologies in composting.

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