数字农科院2.0

Rapid inactivation of Bacillus cereus and formation of bacterial-derived nitrogenous disinfection byproducts during UV265-LED/chlorine disinfection

文献类型： 外文期刊

作者： Tang, Qian;Deng, Lin;Wang, Tao;Tan, Chaoqun;Zhang, Changbo;Hu, Jun;Singh, Rajendra Prasad

作者机构：

关键词： UV265-LED/chlorine;Bacillus cereus;Disinfection byproducts;Dichloroacetonitrile;Halonitromethanes

期刊名称： JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

ISSN： 2213-2929

年卷期： 2025 年 13 卷 5 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： The presence of chlorine-resistant bacteria (CRB) in water treatment plants and distribution systems poses challenges to safe water production. UV265-LED/chlorine is an emerging disinfection process that may effectively inactivate CRB, but the formation of disinfection byproducts (DBPs) remains a concern. Note that bacteria have the potential to form nitrogenous DBPs (N-DBPs), as chlorine-based disinfection inevitably leads to the production of nitrogen-rich bacterial organic matter. However, the formation risk of N-DBPs from bacteria during UV265-LED/chlorine disinfection has not been reported. Here, Bacillus cereus (B. cereus) was selected to investigate the inactivation of CRB and the formation risk of bacterial-derived haloacetonitriles and halonitromethanes during UV265-LED/chlorine disinfection. Results showed that UV265-LED/chlorine could rapidly inactivate B. cereus (achieving 7-log inactivation within 3 min) compared to other disinfection processes. Moreover, B. cereus would form dichloroacetonitrile, chloronitromethane, and trichloronitromethane during UV265-LED/chlorine and other chlorine-based disinfection. The concentration order of these N-DBPs when achieving approximately the same inactivation target (e.g., 5-log and 7-log inactivation) was: UV265-LED/chlorine approximate to UV254/chlorine < UV222/chlorine < chlorination. It was further found that during UV265-LED/chlorine disinfection, reducing B. cereus concentration, UV irradiation, chlorine dosage, or increasing pH could reduce N-DBPs formation. Additionally, B. cereus would also form N-DBPs during real water disinfection. Possible formation mechanism indicated that organic matter produced by B. cereus could be degraded into small molecules (e.g., amino acids, amines, and nucleobases) and then converted into N-DBPs. The findings of this study will contribute to a better application of UV265-LED/chlorine disinfection and deepen the understanding of the bacterial-derived N-DBPs formation.

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