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| Effects of biocurrent on spectral characteristics of organic matter released from degradable mulch film |
| Received:February 20, 2025 |
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| KeyWord:degradable mulching film;dissolved organic matter;electronic transmission;microplastics;microbial electrochemistry |
| Author Name | Affiliation | E-mail | | YANG Pinpin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs/Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | WEI Xiaohe | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs/Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | SHI Changwen | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHANG Xiaolin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs/Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | LI Xiaojing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs/Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | lixiaojing@caas.cn |
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| Abstract: |
| In order to study the effect of biocurrent on dissolved organic matter（DOM）in the process of biocurrent enhanced degradation of biodegradable mulching films（BDMs）, and to clarify the regulatory effect of biocurrent on the release process of DOM from plastic degradation sources, biocurrent enhanced and photoaging degradation experiments were carried out on three kinds of BDMs. The results showed that the microbial electrochemical systems（MES）with different mulches could output a certain voltage. The output voltage of twocolor mulches was the highest, and the output voltage of white mulches was the lowest, and the stability was poor. In addition, UV irradiation has an exciting effect on the electrical performance of different plastic treatments. The three-dimensional fluorescence spectrum analysis of DOM in effluent showed that MES could significantly reduce the concentration of DOM, and the reduction rate reached 60%. Biocurrent can accelerate the degradation of BDMs and change the composition and content of DOM. The fluorescence peak range, peak position and fluorescence intensity of DOM in the effluent of MES treated with different plastic films changed significantly compared with that without electrode, and MES promoted the transformation of humus substances to tyrolinoid proteins. This study reveals the key role of biocurrent in DOM transformation, and the biocurrent generated by microbial metabolism will promote the molecular structure reorganization of DOM and its transformation process. |
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