Genotoxicity removal of reclaimed water during ozonation

Xin Tang; Qianyuan Wu; Yang Yang; Hongying Hu

doi:10.1016/S1001-0742(13)60595-1

Genotoxicity removal of reclaimed water during ozonation

J Environ Sci (China). 2014 Jun 1;26(6):1243-8. doi: 10.1016/S1001-0742(13)60595-1.

Authors

Xin Tang¹, Qianyuan Wu², Yang Yang³, Hongying Hu⁴

Affiliations

¹ Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: tangx05@mails.tsinghua.edu.cn.
² Shenzhen Laboratory of Microorganism Application and Risk Control, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
³ Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China.
⁴ Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China; Shenzhen Laboratory of Microorganism Application and Risk Control, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China. Electronic address: hyhu@tsinghua.edu.cn.

PMID: 25079832
DOI: 10.1016/S1001-0742(13)60595-1

Abstract

Genotoxicity in wastewater and reclaimed water now is gaining increased attention because of genotoxins' potential damage to the ecosystem and human health. The effect of ozonation on genotoxicity in reclaimed water was investigated. It was found that ozonation decreased the genotoxicy dramatically in three tertiary treatment plants. In the further batch ozonation experiment in laboratory, secondary effluent sample used exhibited the genotoxicity of (41.1 ± 4.1) μg 4NQO/L. Ozonation with a dose of 10 mg O3/L completely removed the genotoxicity in secondary effluent. However, after ozonation, the dissolved organic carbon value of the sample didn't change much but the specific ultraviolet absorbance (SUVA) value dropped sharply. With the help of Fourier transform infrared spectroscopy, ozonation was found to change chemical aliphatic carbon and C-O of the dissolved organic matter, which might be the reason of the significant decreases of SUVA and genotoxicity.

Keywords: fourier transform infrared spectroscopy; genotoxicy; ozonation; specific ultraviolet absorbance.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Mutagenicity Tests
Ozone*
Water Pollution / prevention & control*
Water Purification*

Substances

Ozone