Deng Jing, Tang Kai, Zhu Shijun, Ma Xiaoyan, Zhang Kejia, Song Yali, Li Xueyan, Li Qingsong, Liu Zhenhua, Zhou Kejin
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China.
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China.
Int J Environ Res Public Health. 2015 Dec 4;12(12):15434-48. doi: 10.3390/ijerph121214995.
The occurrence of natural estrogens including estrone (E1), 17β-estradiol (E2), and synthetic 17α-ethinylestradiol (EE2), which can be excreted by both humans and animals, and can enter the aqueous environment along with the discharge of domestic sewage, is a major concern since this may represent a serious health risk to humans even at extremely trace levels (ng·L(-1)). Simultaneous degradation of three coexisting steroid estrogens (SEs) in aqueous solutions by coupled ultrasound and KMnO₄ systems (KMnO₄/ultrasound) were investigated to find out whether there is a competitive degradation of multiple contaminants or not. Results indicate that the degradation ratios of target SEs were all more than 50% after 120 min reaction contact, greatly enhanced when compared with the single KMnO₄ (2 mg·L(-1)) oxidation of E2 (37.0%), EE2 (34.4%), and E1 (34.0%), and the single sonochemical oxidation of E2 (37.1%), EE2 (31.1%), and E1 (29.7%). In the adopted processes, the degradations of SEs fit the first-order kinetic reaction, with different reaction rates. Kinetic parameters revealed there was little difference between coexisting SEs, which means there was almost no competitive degradation. The removal efficiency and degradation rate of SEs in natural water was higher than those in pure water, which suggested that the coupled KMnO₄/ultrasound technology had prospective applications in the removal of complex contaminants in actual drinking water treatment.
包括雌酮（E1）、17β-雌二醇（E2）在内的天然雌激素以及合成的17α-乙炔雌二醇（EE2）可由人类和动物排出，并会随着生活污水的排放进入水环境，这是一个主要问题，因为即使在极低的痕量水平（ng·L⁻¹）下，这也可能对人类健康构成严重风险。研究了耦合超声和KMnO₄体系（KMnO₄/超声）对水溶液中三种共存甾体雌激素（SEs）的同时降解情况，以确定是否存在多种污染物的竞争性降解。结果表明，反应接触120分钟后，目标SEs的降解率均超过50%，与E2（37.0%）、EE2（34.4%）和E1（34.0%）的单一KMnO₄（2mg·L⁻¹）氧化以及E2（37.1%）、EE2（31.1%）和E1（29.7%）的单一声化学氧化相比有显著提高。在所采用的工艺中，SEs的降解符合一级动力学反应，反应速率不同。动力学参数表明共存SEs之间差异不大，这意味着几乎不存在竞争性降解。天然水中SEs的去除效率和降解速率高于纯水中的，这表明耦合KMnO₄/超声技术在实际饮用水处理中去除复杂污染物方面具有潜在应用前景。
