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

赵娜; 曹瑞华; 黄廷林; 文刚

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5529-5542.

环境生态

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

赵娜, 曹瑞华, 黄廷林, 文刚

作者信息 +

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

Author information +

文章历史 +

摘要

选取典型含氮消毒副产物前体物天冬氨酸（Asp）为研究对象，研究了不同溶解氧（DO）浓度、不同压力MOM条件下Asp的转化规律及消毒副产物生成势（DBPFPs）变化，进一步阐明了MOM条件下影响Asp转化的主要环境因素及潜在机理.结果表明：不同MOM条件下，Asp水样的溶解性有机碳（DOC）、溶解性有机氮（DON）和T-DBPFPs均随着反应时间的增加逐渐降低；反应第3d，与厌氧（常压）条件相比较，压力为0.30MPa、DO为0.50mg/L的MOM条件下DOC和DON的下降程度（16.40%~25.50%）以及T-DBPFPs的下降程度（30.34%~59.81%）较低，这与该条件下微生物代谢过程中产生更多可溶性生物代谢物（C2组分）有关；此外，压力为0.30MPa、DO为3.00~7.00mg/L的MOM条件下DOC、DON和T-DBPFPs的下降程度（DOC和DON：70.27%~95.00%；T-DBPFPs：61.50%~98.88%）高于DO为0.50mg/L的MOM条件下的下降程度.综上所述，较低DO浓度和压力下的MOM条件不利于Asp水样的转化.冗余分析表明，DO浓度是MOM条件下影响Asp转化的主要水环境因素；细菌群落分析进一步证实，低DO浓度MOM条件下细菌群落多样性显著下降，从而影响细菌对Asp水样的代谢产物和转化程度，不利于DBPFPs的降低.因此，研究MOM条件下Asp水样的转化规律与机制对于保障饮用水安全具有重要意义.

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 3^th 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.

导出引用

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[J]. China Environmental Science. 2023, 43(10): 5529-5542

中图分类号： X524

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