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| Effects of attapulgite on the humification of cabbage waste composting |
| Received:April 17, 2023 Revised:June 21, 2023 |
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| KeyWord:aerobic composting;humification;cabbage waste;attapulgite;dissolved organic carbon |
| Author Name | Affiliation | E-mail | | ZHU Yijuan | College of Resources and Environment, Southwest University, Chongqing 400716, China
Key Laboratory of Agriculture Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | | | XIAO Honglin | College of Resources and Environment, Southwest University, Chongqing 400716, China | | | LIU Yangting | College of Resources and Environment, Southwest University, Chongqing 400716, China | | | ZHU Kangwen | Chongqing Academe of Ecoenvironmental Science, Chongqing 401147, China
College of Smart City, Chongqing Jiaotong University, Chongqing 400074, China | | | YANG Zhimin | College of Resources and Environment, Southwest University, Chongqing 400716, China
Key Laboratory of Agriculture Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | | | YANG Hongjun | College of Resources and Environment, Southwest University, Chongqing 400716, China | | | CHEN Yucheng | College of Resources and Environment, Southwest University, Chongqing 400716, China
Key Laboratory of Agriculture Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | 372505096@qq.com |
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| Abstract: |
| This study aimed to elucidate that the addition of attapulgite promotes the humification of cabbage waste compost. Cabbage waste and corn straw were used as raw materials in this study, and attapulgite with mass fractions of 0 (CK), 2.5%(T1), 5%(T2), and 7.5% (T3)were added to the raw materials for aerobic composting to investigate the effects on their basic physicochemical properties, organic matter components, and humification. Correlation analysis and structural equation model(SEM)were used to explore the mechanism behind the humification process. The results showed that the high temperature period of the compost was prolonged by 1-3 days with the addition of attapulgite. Seed germination index increased by 27.97% and 42.06% with better maturity and organic matter degradation rate increased by 1.67% and 6.92% in the T2 and T3 treatments, respectively, compared with CK. In addition, compared with that in the initial state, the content of fulvic acid(FA)in CK, T1, T2, and T3 decreased by 39.88%, 42.92%, 47.28%, and 47.68%, respectively, at the end of composting. However, the content of humic acid(HA)increased by 89.08%, 129.78%, 135.83%, and 162.50%, respectively, at the end of composting, which increased the aromaticity of the pile. The results of correlation analysis and SEM demonstrated that the addition of attapulgite caused a positive and negative shift in the correlation between dissolved organic carbon(DOC)and humic fractions and precursors, indicating that it promoted the synthesis of HA by affecting DOC. Simultaneously, it also increased the pathways that significantly affected the formation of HA, promoting the conversion of amino acid, reducing sugar, and FA to HA, thus enhancing the degree of humification. This study demonstrated that the addition of attapulgite at 7.5% can significantly promote the composting of cabbage waste, effectively activate precursors, and improve the aromaticity and humification of humus. |
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