Simultaneous Degradation of Estrone, 17?-Estradiol and 17?-Ethinyl Estradiol in an Aqueous UV/H 2 O 2 System

Xiaoyan Ma, Chao Zhang, Jing Deng, Yali Song, Qingsong Li, Yaping Guo and Cong Li
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Xiaoyan Ma: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China
Chao Zhang: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China
Jing Deng: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China
Yali Song: School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China
Qingsong Li: Water Resources and Environmental Institute, Xiamen University of Technology, Xiamen 361005, China
Yaping Guo: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Cong Li: College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

IJERPH, 2015, vol. 12, issue 10, 1-14

Abstract: UV/H 2 O 2 , which is an advanced treatment technology used to reduce multiple contaminants, is effective in potable water treatment. Simultaneous degradation effects and kinetics of three types of coexisting micropollutant estrogens (steroid estrogens, SEs), including estrone (E1), 17?-estradiol (E2) and 17?-ethinyl estradiol (EE2), in deionized water were studied. Experiments were carried out with ultraviolet-C (UVC) radiation, together with hydrogen peroxide (H 2 O 2 ), in a cylinder photoreactor. The results demonstrated that the degradation processes of all of the estrogens strongly fit first-order kinetics. Single solutions of E1, E2 and EE2 showed higher degradation rates and removal efficiencies under the same reaction conditions compared with those under mixed conditions. Coexisting combinations of estrogens were put into the UV/H 2 O 2 system to estimate their possible competitive influences on each other by examining their removal efficiencies and reaction rate constant, k , values. E1 is predominantly reduced rapidly during the competition, while the presence of other estrogens has negligible impacts on E1; however, the degradation of E2 and EE2 is affected by the competitive background, not in relation to the types but to the existing amounts. In the UV/H 2 O 2 system, photocatalysis of the estrogens can stably produce an intermediate X, with the highest quantity coming from E1, while considerably lower quantities are obtained from E2 and EE2.

Keywords: UV/H 2 O 2; steroid estrogens; competitive degradation; photocatalysis; water treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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