Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast China, Ministry of Education, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.
Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast China, Ministry of Education, Northeast Normal University, Changchun 130117, China; Jilin Engineering Lab for Water Pollution Control and Resources Recovery, Northeast Normal University, Changchun 130117, China.
J Hazard Mater. 2024 Mar 5;465:133083. doi: 10.1016/j.jhazmat.2023.133083. Epub 2023 Nov 25.
In this study, an organic loading (OL) of 300 mg/(L d) was set as the relative normal condition (OL-300), while 150 mg/(L d) was chosen as the condition reflecting excessively low organic loading (OL-150) to thoroughly assess the associated risks in the effluent of the biological wastewater treatment process. Compared with OL-300, OL-150 did not lead to a significant decrease in dissolved organic carbon (DOC) concentration, but it did improve dissolved organic nitrogen (DON) levels by ∼63 %. Interestingly, the dissolved organic matter (DOM) exhibited higher susceptibility to transformation into chlorinated disinfection by-products (Cl-DBPs) in OL-150, resulting in an increase in the compound number of Cl-DBPs by ∼16 %. Additionally, OL-150 induced nutrient stress, which promoted engendered human bacterial pathogens (HBPs) survival by ∼32 % and led to ∼51 % increase in the antibiotic resistance genes (ARGs) abundance through horizontal gene transfer (HGT). These findings highlight the importance of carefully considering the potential risks associated with low organic loading strategies in wastewater treatment processes.
在这项研究中，设定 300mg/（L·d）的有机负荷（OL）作为相对正常条件（OL-300），而选择 150mg/（L·d）作为反映过低有机负荷（OL-150）的条件，以彻底评估生物废水处理过程中出水的相关风险。与 OL-300 相比，OL-150 并没有导致溶解有机碳（DOC）浓度显著下降，但它确实将溶解有机氮（DON）水平提高了约 63%。有趣的是，DOM 在 OL-150 中表现出更高的转化为氯化消毒副产物（Cl-DBPs）的易感性，导致 Cl-DBPs 的化合物数量增加了约 16%。此外，OL-150 导致营养物胁迫，通过水平基因转移（HGT），促使产生的人类细菌病原体（HBPs）的存活率增加了约 32%，并导致抗生素抗性基因（ARGs）丰度增加了约 51%。这些发现强调了在废水处理过程中仔细考虑与低有机负荷策略相关的潜在风险的重要性。
