Transformation study of aspartic acid in under metalimnetic oxygen minimum region of reservoirs: regularity and mechanism
ZHAO Na, CAO Rui-hua, HUANG Ting-lin, WEN Gang
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：Aspartic acid (Asp), a typical precursor of containing nitrogen disinfection byproducts, was selected as the research object to investigate the transformation of Asp and the variation of disinfection byproduct formation potential (DBPFPs) under MOM condition with different concentration of dissolved oxygen (DO) and pressure. The main environmental factors and potential mechanism of Asp transformation was further clarified. The results showed that the dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and T-DBPFPs of Asp water samples decreased gradually with the increase of reaction time under different MOM condition. Compared with anaerobic condition (atmospheric pressure), a lower decrease was occurred in DOC and DON (16.40%~25.50%) and T-DBPFPs (30.34%~59.81%) under MOM condition with 0.30MPa pressure and 0.50mg/L DO, which was related to more soluble biometabolites (C2 component) were produced during microbial metabolism under such condition. In addition, the decrease in DOC, DON, and T-DBPFPs (DOC and DON:70.27%~95.00%; T-DBPFPs:61.50%~98.88%) under MOM condition with 0.30MPa pressure and 3.00~7.00mg/L DO aerobic condition was higher than those under MOM condition with 0.50mg/L DO at 3th day of reaction. Combining the above discussion, it can be concluded that the MOM condition with pressure and lower DO concentration was not conducive to the transformation of Asp water samples. The redundancy analysis showed that DO concentration was the main water environmental factor affecting Asp transformation under MOM condition. Bacterial community analysis further confirmed that the diversity of bacterial community decreased significantly under MOM condition with lower DO concentration, affecting the metabolites and transformation degree of bacteria to Asp water samples and the reduction of DBPFPs. Therefore, it is of great significance to investigate the transformation and its mechanism of Asp water sample under MOM condition for ensuring drinking water safety.
赵娜, 曹瑞华, 黄廷林, 文刚. 水库温跃层氧最小值区域天冬氨酸的转化研究:规律及机制[J]. 中国环境科学, 2023, 43(10): 5529-5542.
ZHAO Na, CAO Rui-hua, HUANG Ting-lin, WEN Gang. Transformation study of aspartic acid in under metalimnetic oxygen minimum region of reservoirs: regularity and mechanism. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5529-5542.
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