Catalytic ozonation of emerging pollutant and reduction of toxic by-products in secondary effluent matrix and effluent organic matter reaction activity

Yuting Zhang; Yechen An; Chao Liu; Yiping Wang; Zilong Song; Yanning Li; Weidong Meng; Fei Qi; Bingbing Xu; Jean-Philippe Croue; Donghai Yuan; Amir Ikhlaq

doi:10.1016/j.watres.2019.115026

Catalytic ozonation of emerging pollutant and reduction of toxic by-products in secondary effluent matrix and effluent organic matter reaction activity

Water Res. 2019 Dec 1:166:115026. doi: 10.1016/j.watres.2019.115026. Epub 2019 Aug 30.

Authors

Yuting Zhang¹, Yechen An², Chao Liu¹, Yiping Wang¹, Zilong Song¹, Yanning Li¹, Weidong Meng¹, Fei Qi³, Bingbing Xu⁴, Jean-Philippe Croue⁵, Donghai Yuan⁶, Amir Ikhlaq⁷

Affiliations

¹ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, PR China.
² Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing, 100044, PR China.
³ Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, PR China. Electronic address: qifei@bjfu.edu.cn.
⁴ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, PR China.
⁵ Curtin Water Quality Research Centre, Department of Chemistry, Curtin University, Perth, WA, 6845, Australia.
⁶ Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing, 100044, PR China. Electronic address: yuandonghai@bucea.edu.cn.
⁷ Institute of Environmental Engineering and Research, University of Engineering and Technology, Punjab, 54890, Pakistan.

PMID: 31514100
DOI: 10.1016/j.watres.2019.115026

Abstract

In this study, the performance of LaCoO₃ (LCO) catalytic ozonation was evaluated comprehensively, including the degradation efficiency of benzotriazole (BZA) as a typical emerging pollutant, toxic bromate reduction and the disinfection by-products (DBPs) precursors removal ability in effluent organic matter (EfOM), as well as EfOM reactive activity in catalytic ozonation. Additionally, the reduction of toxic halogenated by-products in (catalytic) ozonation was reported, which was not focused on previous researches before. Results showed that LCO catalytic ozonation improved the removal efficiency of BZA, UV₂₅₄ and SUVA via enhanced HO· formation. Interestingly, LCO catalytic ozonation showed the ability on the reduction of aldehydes and toxic halogenated organic by-products. Moreover, the formed [trichloromethane (TCM)], [bromochloroacetonitrile (BCAN)] and [dichloroacetamide (DCAcAm)] decreased significantly in catalytic ozonation. Catalytic ozonation was also able to remove DBPs precursors to decline the formation of DBPs, such as TCM, bromodichloromethane (BDCM), trichloroacetonitrile (TCAN) and trichloronitromethane (TCNM). This process was involved in the transformation of EfOM in catalytic ozonation, which was confirmed by multi-spectrum methods, two-dimensional correlation spectroscopy (2D-COS) and hetero-spectral 2D-COS. In summary, LCO was shown to be an effective catalyst to improve the performance of the sole ozonation on the removal of emerging contaminants and DBPs precursors, as well as toxic by-products reduction. Additionally, the strategy of toxic by-products reduction in catalytic ozonation was proposed. Results indicated this technology was an important contribution on removal of refractory organics and formation of toxic by-products in water supply and wastewater treatment industry.

Keywords: Benzotriazole; Catalytic ozonation; Disinfection by-products; Effluent organic matter; Two-dimensional correlation spectroscopy.

MeSH terms

Environmental Pollutants*
Ozone*
Wastewater
Water Pollutants, Chemical*
Water Purification*

Substances

Environmental Pollutants
Waste Water
Water Pollutants, Chemical
Ozone