Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
J Hazard Mater. 2023 Mar 5;445:130591. doi: 10.1016/j.jhazmat.2022.130591. Epub 2022 Dec 10.
The metalimnetic oxygen minimum (MOM) is a common anaerobic phenomenon that occur between 5.00 and 40.00 m of reservoirs. Amino acids (AAs) are widely found in water, but their change in MOM remain unclear. In this study, four AAs with different side chain groups were selected to explore the change of their samples and related disinfection by-products formation potential (DBPFPs) under MOM condition. The results showed that the final degradation rate of dissolved organic carbon and dissolved organic nitrogen of four AAs samples were 11.71%-59.87% and 26.50%-100.00% under MOM condition. Aspartic acid samples were the easiest to be degraded, whereas glycine samples were the opposite. While the total fluorescence intensity increased by 6.30%-113.40% for the appearance of tryptophan-like substance. The total DBPFPs of glutamic acid, arginine and aspartic acid samples were finally decreased by 4.73%, 8.00% and 98.88% (glycine sample increased by 2.30 times). Compared with the surface condition, the degradation of AAs samples and the change of DBPFPs were significantly inhibited under MOM condition. In addition, the diversities of bacterial communities were significantly reduced under MOM condition, which was very unfavorable to the degradation of AAs samples, and in turn affected the control of DBPs and deteriorated the water quality.
底栖氧亏区（MOM）是一种常见的厌氧现象，发生在水库的 5.00 至 40.00 米之间。氨基酸（AAs）广泛存在于水中，但它们在 MOM 下的变化尚不清楚。在这项研究中，选择了四种具有不同侧链基团的氨基酸来探索它们的样品在 MOM 条件下的变化及其相关消毒副产物生成潜力（DBPFPs）。结果表明，四种氨基酸样品的溶解有机碳和溶解有机氮的最终降解率分别为 11.71%至 59.87%和 26.50%至 100.00%。在 MOM 条件下，天冬氨酸样品最容易降解，而甘氨酸样品则相反。而色氨酸样物质的总荧光强度增加了 6.30%至 113.40%。谷氨酸、精氨酸和天冬氨酸样品的总 DBPFPs 最终分别降低了 4.73%、8.00%和 98.88%（甘氨酸样品增加了 2.30 倍）。与表面条件相比，在 MOM 条件下，AAs 样品的降解和 DBPFPs 的变化受到明显抑制。此外，在 MOM 条件下，细菌群落的多样性明显减少，这对 AAs 样品的降解非常不利，进而影响了 DBPs 的控制并恶化了水质。
