中文摘要：

针对天然水体常见的重金属-有机污染物复合污染问题,探讨水体中普遍存在的溶解性有机质（DOM）对有机污染物降解的影响。采集黄河花园口断面水样,模拟天然水体中DOM质量浓度变化,研究了17β-雌二醇（E2）单一污染体系和Cu（II）-E2复合污染体系中DOM对E2降解的影响,用环境扫描电镜、傅里叶变换红外光谱和X射线光电子能谱等手段分析了Cu（II）-E2复合污染体系中DOM与Cu（II）的作用机理。结果表明：在E2单一污染体系中,DOM明显促进E2降解,E2降解速率常数由0.062 d-1提高到0.430 d-1;在Cu（II）-E2复合污染体系中,DOM与Cu（II）络合,改变了Cu（II）的沉淀形态,降低了Cu（II）对微生物的抑制作用,因此,E2降解速率常数由0.006 d-1提高到0.030 d-1。

英文摘要：

The aim of this paper is to investigate the role of dissolved organic matters（ DOM） on the biodegradation of 17β-estradiol（ E2） in the single contamination system of E2 and co-contamination system of Cu（ II） and E2,respectively. For this purpose,we＇ve collected natural water samples from the Yellow River and simulated the concentration variation of DOM and Cu（ II）in natural water by adding humic acid（ 0- 15 mg / L） and Cu（ II）（ 0,10 mg/L）,respectively. The data of E2 biodegradation proves to be fit for the first-order kinetics equation. We have also investigated the mechanism of the interaction between DOM and E2 by using the excitation-emission matrix spectroscopy. At the same time,we have also analyzed the interaction between DOM and E2 via the Fourier Transform infrared spectroscopy,X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The results of our analysis demonstrate that the data of E2 biodegradation can properly depicted by the first-order kinetics equation in both single contamination system of E2（ R2≥0. 828）and co-contamination system of Cu（ II） and E2（ R2≥0. 812）.What is more,the addition of DOM can help to accelerate the biodegradation of E2 from 0. 062 d- 1to 0. 430 d- 1in the single contamination system of E2,but it would be becoming more and more difficult from 0. 030 d- 1to 0. 006 d- 1in the co-contamination system of Cu（ II） and E2. In addition,the complexation between the DOM and E2 could speed up the transference of E2 to the surface of the bacteria. The complexation between DOM and Cu（ II） can also be expected to change the precipitation form of Cu（ II） from nano-particles to longer and thinner particles in a size about 10 μm,which tends to behave less toxic to the microorganism and alleviated inhibitory effect of copper on E2 biodegradation. In so doing,the results obtained can be made useful for comprehensive understanding and appropriate evaluation of the interactive performance of the different contaminan