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Fe/BC co-conditioners with environmental and economic benefits on composting: reduced NH3 emissions and improved fertilizer quality

文献类型： 外文期刊

作者： Wang, Jixiang 1 ; Xie, Huifang 2 ; Wu, Jun 3 ; He, Weijiang 1 ; Zhang, Xi 1 ; Huang, Junxia 2 ; Feng, Yanfang 1 ; Xue, Lihong 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China

2.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources Re, Nanjing 210094, Peoples R China

3.Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resources Dev Shallow, Minist Educ, Nanjing 210098, Peoples R China

关键词： Aerobic composting; Biochar; Organic fertilizer; NH3 emissions; FeCl3

期刊名称：BIOCHAR （ 影响因子：12.7； 五年影响因子：13.1 ）

ISSN： 2524-7972

年卷期： 2024 年 6 卷 1 期

页码：

收录情况： SCI

摘要： The significant volatilization of NH3 during aerobic composting causes nitrogen (N) losses and environmental risks. Both iron (Fe) and biochar (BC) can influence the N conversion process in composting. Fe application can delay the maturation of materials, while biochar can enhance the quality of organic fertilizer. The combination of these two conditioners may help decrease NH3 emissions and improve organic fertilizer quality. Therefore, this study investigates the effects of different doses of FeCl3 and BC on NH3 emissions and organic fertilizer quality during composting. The results demonstrated that Fe/BC co-conditioners reduced the accumulation of NH3 emissions during composting by 11.1-48.2%, increased the total nutrient content by 0.6-15.3%, and enhanced economic and environmental benefits by 0.1-23.6 $ t(-1). At the high-temperature stage of composting, Fe/BC co-conditioners decreased the pH by 0.3-1.2, but there was no significant difference compared to the control at the end of composting, and they did not affect compost maturation. The structural equation model analysis suggested that the reduction in NH3 emissions was related to ammonia-oxidizing bacteria (AOB), NH4+-N, and total nitrogen (TN). As a result, the Fe/BC co-conditioners reduced NH3 emissions by lowering the pH at the beginning of composting and increasing the content of NH4+-N. This study concludes that Fe/BC co-conditioners could complement each other to significantly reduce NH3 emissions and improve the quality of organic fertilizers.

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