Regulating bacterial dynamics by Mg-modified biochar addition to mitigate gaseous emissions during pig manure composting

文献类型： 外文期刊

第一作者： Gu, Xuhan

作者： Gu, Xuhan;Li, Hui;Shi, Yixun;Li, Shuyan;Li, Jijin

作者机构：

关键词： Composting; Pig manure; Gaseous emission; Mg -modified biochar; Bacterial community

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.7； 五年影响因子：10.2 ）

ISSN： 0959-6526

年卷期： 2024 年 465 卷

页码：

收录情况： SCI

摘要： Gaseous emissions (i.e. Greenhouse gases (CH 4 and N 2 O) and NH 3 ) were a serious environmental problem during composting. Magnesium salt could effectively reduce NH 3 emission with the principle of struvite crystallization. Biochar, particularly modified biochar, could be served as a new type of adsorbent for gaseous reduction. In this study, Mg -modified biochars were successfully prepared with different magnesium to biochar mass ratios, and then used as additives in pig manure composting. Mg -modified biochars exhibited excellent properties in terms of functional groups, porous structure and composition. Adding Mg -modified biochar improved composting performance, and thus synergistically reduced CH 4 , N 2 O and NH 3 emissions. Especially, Mg -modified biochar prepared with the magnesium to biochar mass ratio of 0.50 (MBC-0.50) achieved the best reduction effects during pig manure composting. Both additive and composting phases could influence the bacterial composition by regulating temperature, pH, electrical conductivity and moisture content. Besides biochar adsorption, NH 3 could be further reduced with the formation of struvite crystallization (MgNH 4 PO 4 & sdot;6H 2 O) by adding Mgmodified biochar. Pristine and modified biochars inhibited the proliferation of denitrifying bacteria (e.g. Pseudoxanthomonas and norank-f-Methylococcaceae ) and anaerobe methanogenic bacteria (e.g. Jeotgalibaca and Lactobacillus ) to further mitigate N 2 O and CH 4 emissions. Results from this study provided unique insights to the development of Mg -modified biochar additive for mitigating CH 4 , N 2 O and NH 3 emissions during composting.

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