Abstract
Ionizing irradiation, as a new pretreatment method for the anaerobic fermentation of organic pollutants, is featured with fast reaction speed, good treatment effect, no need to add any chemical reagents, and no secondary pollution. This study explores the mechanism of improving anaerobic fermentation performance of rice samples pretreated by cobalt-60 gamma irradiation through the influence on fermentation substrate, acidogenic phase and methanogenic phase. The results reveal that the soluble chemical oxygen demand of the irradiated rice sample at an absorbed dose of 9.6 kGy increases by 12.4 times due to the dissolution of small molecules of fat-soluble organic matter. The yield of biogas in the acidogenic phase increases by 22.2% with a slight increase in hydrogen gas content. The yield of biogas and methane gas content in the methanogenic phase increases by 27.3% and 15%, respectively. Microbial genome analysis, performed with MiSeq high-throughput sequencing and metagenomic methods, suggests the microbial abundance and metabolic functions in the anaerobic fermentation process change significantly as a result of the pretreatment by gamma irradiation.
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This work was supported by the Fundamental Research Funds for the Central Universities (grant no. NS2022056). The work was supported by the National Natural Science Foundation of China (grant no. 51878611 and 11405086). And this work was supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Yongsheng Ling: conceptualization, methodology, and writing—review and editing. Lingxi Li: conceptualization, methodology, and writing—original draft. Chao Zhou: formal analysis. Zhen Li: formal analysis. Jiahao Xu: resources. Qing Shan: formal analysis. Daqian Hei: formal analysis. Chao Shi: resources. Jiandong Zhang: resources. Wenbao Jia: supervision.
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Ling, Y., Li, L., Zhou, C. et al. Mechanism of improving anaerobic fermentation performance of kitchen waste pretreated by ionizing irradiation—part 1: rice. Environ Sci Pollut Res 31, 25287–25298 (2024). https://doi.org/10.1007/s11356-024-32731-1
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DOI: https://doi.org/10.1007/s11356-024-32731-1