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付晶淼, 李睿, 杨扬, 张晓萌, 陈善旭, 陆慧琳, 王雪丽, 黄梦娜, 王茜琰, 戴玉女. E2-3S在水平流人工湿地中的降解与转化[J]. 水生生物学报, 2022, 46(10): 1437-1446. doi: 10.7541/2022.2022.0157
引用本文: 付晶淼, 李睿, 杨扬, 张晓萌, 陈善旭, 陆慧琳, 王雪丽, 黄梦娜, 王茜琰, 戴玉女. E2-3S在水平流人工湿地中的降解与转化[J]. 水生生物学报, 2022, 46(10): 1437-1446. doi: 10.7541/2022.2022.0157
FU Jing-Miao, LI Rui, YANG Yang, ZHANG Xiao-Meng, CHEN Shan-Xu, LU Hui-Lin, WANG Xue-Li, HUANG Meng-Na, WANG Xi-Yan, DAI Yu-Nü. DEGRADATION AND TRANSFORMATION OF E2-3S IN HORIZONTAL FLOW CONSTRUCTED WETLAND[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(10): 1437-1446. doi: 10.7541/2022.2022.0157
Citation: FU Jing-Miao, LI Rui, YANG Yang, ZHANG Xiao-Meng, CHEN Shan-Xu, LU Hui-Lin, WANG Xue-Li, HUANG Meng-Na, WANG Xi-Yan, DAI Yu-Nü. DEGRADATION AND TRANSFORMATION OF E2-3S IN HORIZONTAL FLOW CONSTRUCTED WETLAND[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(10): 1437-1446. doi: 10.7541/2022.2022.0157

E2-3S在水平流人工湿地中的降解与转化

DEGRADATION AND TRANSFORMATION OF E2-3S IN HORIZONTAL FLOW CONSTRUCTED WETLAND

  • 摘要: 研究采用同时检测15种自由态雌激素(Free estrogens, FEs)及结合态雌激素(Conjugated estrogens, CEs; 包括雌激素手性分子、异构体、单位点及多位点结合的CEs)的方法, 探讨目标污染物17β-estradiol-3-sulfate (E2-3S)与其他类型雌激素(包括自由态雌激素与其他结合态雌激素)间的转化关系, 研究E2-3S在有/无植物水平流人工湿地(HFCWs)中的降解规律。结果显示: 在停留时间为1.5d的工况下, E2-3S在HFCWs进水端基质水平距离0 cm深度15 cm中转化率已达98%, E2-3S可转化为其他雌激素, 产物以FEs为最丰富(均占70%以上), 植物可以显著提高湿地DO浓度, 使FEs残留浓度比无植物CW(U-CW)更低, 有植物CW(P-CW)和U-CW对总雌激素去除效率分别为86%和58%; E2-3S的主要转化路径为经硫酯键断裂形成E2再氧化生成E1, 其次路径为直接氧化为E1-3S再水解生成E1, 少量路径为羟基化形成E3-3S再水解生成E3, 此外, E2-3S还可以产生痕量双位取代D-CEs(<总雌激素的5%), 且植物系统中存留量更低。

     

    Abstract: Conjugated estrogens (CEs) are important existing form of natural estrogens, which can be hydrolyzed into free forms (Free estrogens, FEs), producing strong endocrine interference effects in the environment. Therefore, they have potential environmental risks. The degradation and transformation behavior of CEs with complex structure is not clear in the sewage treatment system, which is the key to accurately assess the comprehensive removal of estrogens. This study adopted a methodology of simultaneous analysis and detection of 15 kinds of FEs and CEs, to study the degradation behaviour of 17β-estradiol-3-sulfate (E2-3S) in planted and unplanted horizontal flow constructed wetlands (HFCWs) and also the transformation relationship between various estrogens. The results showed that under the condition of hydraulic residence time of 1.5 days, the removal efficiency of E2-3S reached 98% in the substrate depth of 15 cm at the inlet end of HFCWs. E2-3S could be transformed into other estrogens, which were the most abundant in FEs (accounting for more than 70%). Plants could significantly increase the wetland DO concentration and reduce the residual concentration of FEs. The removal efficiency of total estrogens by planted CW(P-CW) and unplanted CW(U-CW) were 84% and 56%, respectively. The major transformation pathway of E2-3S in HFCWs was to break the thioester bond to E2 and then oxidize it to E1, followed by direct oxidation of E2-3S to E1-3S and then hydrolyzing to E1, while a small amount of path was hydroxylation to form E3-3S and then hydrolyzing to E3. In addition, E2-3S could also produce trace D-CEs (< 5% of total estrogen), and the residual quantity in P-CW was lower.

     

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