Fe/BC co-conditioners with environmental and economic benefits on composting:reduced NH_(3)emissions and improved fertilizer quality  

作　　者：Jixiang Wang Huifang Xie Jun Wu Weijiang He Xi Zhang Junxia Huang Yanfang Feng Lihong Xue 

机构地区：[1]Key Laboratory of Agro-Environment in Downstream of Yangtze Plain,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China. [2]Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse,School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China. [3]Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210098,China.

出　　处：《Biochar》2024年第1期50-65,共16页生物炭(英文)

基　　金：National Key Research and Development Program of China(2021YFD1700805);the National Natural Science Foundation of China(No.42277332);Natural Science Foundation of Jiangsu Province(SBK2022022675);Yunnan Branch of China National Tobacco Corporation(2022530000241022);Y.F.Feng thanks the support of“333”High-level Talents Training Project of Jiangsu Province(2022-3-23-083).

摘　　要：The significant volatilization of NH_(3)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 NH_(3)emissions and improve organic fertilizer quality.Therefore,this study investigates the effects of different doses of FeCl_(3)and BC on NH_(3)emissions and organic fertilizer quality during composting.The results demonstrated that Fe/BC co-conditioners reduced the accumulation of NH_(3)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 NH_(3)emis-sions was related to ammonia-oxidizing bacteria(AOB),NH_(4)^(+)-N,and total nitrogen(TN).As a result,the Fe/BC co-conditioners reduced NH_(3)emissions by lowering the pH at the beginning of composting and increasing the content of NH_(4)^(+)-N.This study concludes that Fe/BC co-conditioners could complement each other to significantly reduce NH_(3)emissions and improve the quality of organic fertilizers.

关 键 词：Aerobic composting BIOCHAR Organic fertilizer NH_(3)emissions FeCl_(3) 

分 类 号：S14[农业科学—肥料学]