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| Effects of co-composting biogas residue of kitchen organic slurry and black soldier fly larval frass |
| Received:November 02, 2021 |
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| KeyWord:biogas residue;black soldier fly larval frass;co-composting;humification |
| Author Name | Affiliation | E-mail | | ZHANG Hao | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China | | | RUAN Wenquan | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China | | | LIU Hao | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China | | | XIAO Xiaolan | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China | 516140212@qq.com |
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| Abstract: |
| The effects of co-composting biogas residue of kitchen organic slurry（BR）and black soldier fly larval frass（LF）were investigated in this study. Five mixing ratios（BR∶LF）were designed：T1（4∶0）, T2（3∶1）, T3（1∶1）, T4（1∶3）, and T5（0∶4）. Composting experiments were conducted for 30 days. The results demonstrated that compared with the nitrate nitrogen content in T1, it increased by 72.63%, 77.93%, 88.69%, and 85.99% in T2, T3, T4, and T5, respectively. In addition, the highest organic matter degradation rate, humic substance content, humic acid content and HA/FA were obtained in the T2 treatment with values of 13.80%, 107.55 g·kg-1, 79.20 g·kg-1 and 2.79, respectively. After 30 days of composting, the seed germination index of each treatment group exceeded 80%, of which T1~T4 exceeded 100%. However, the electrical conductivity of the composting product increased significantly with an increase in LF（P<0.05）. The results indicate that the addition of LF can strengthen nitrogen fixation and improve the fertilizer efficiency of composting products. Meanwhile, co-composting can improve the organic matter degradation rate and enhance the humification process. Nevertheless, excessive LF increases the salinity of composting, and thus, produces a certain negative influence on plant growth. A comprehensive comparison of all indicators revealed that the optimal composting group was obtained when the BR∶LF ratio was 3∶1. |
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