Effects of chlorination on the properties of dissolved organic matter and its genotoxicity in secondary sewage effluent under two different ammonium concentrations

Chemosphere
Qian-Yuan WuYi Li

Abstract

Recently, NH(4)(+) has been reported to induce potential risks during wastewater chlorination. Thus, the effects of chlorination on genotoxicity and fluorescence spectra of secondary sewage effluents, were investigated in this study before and after adding a high NH(4)(+) quantity. Chlorination decreased the genotoxicity of secondary sewage effluent, while the presence of a high level of NH(4)(+) inhibited this decrease. By further ultrafiltration following XAD-8 resin fractionation, it was found that, with a high NH(4)(+) concentration, the genotoxicity in the fraction of hydrophobic acids (HOA) increased after chlorination and a sub-fraction of HOA with molecular weight less than 1 kDa was the key fraction resulting in this increase. Similar to genotoxicity changes, NH(4)(+) was also found to influence the changes in fluorescence spectra during chlorination. After chlorination, the fluorescence intensity of the dissolved organic matter (DOM) notably decreased, and the emission band of DOM fluorescence spectra shifted to a lower wavelength. However, the presence of NH(4)(+) inhibited both the decrease in intensity and shift. The changes in fluorescence spectra suggested that the fluorescent structure of secondary effluent may ...Continue Reading

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Citations

Jun 4, 2011·Environmental Monitoring and Assessment·Cristina PignataGiorgio Gilli
Jul 25, 2014·Environmental Science and Pollution Research International·Xin TangHong-Ying Hu
Feb 15, 2016·The Science of the Total Environment·Hong-Ying HuZhuo Chen
May 9, 2016·Journal of Environmental Sciences (China)·Qianyuan WuTing Wang
Jan 15, 2015·Environmental Science & Technology·Jennifer S HarknessAvner Vengosh
Jan 15, 2013·Ecotoxicology and Environmental Safety·A GrammouA I Papadopoulos
Jan 29, 2020·Journal of Toxicology and Environmental Health. Part a·Wenzhi BaiTakashi Kubo
May 1, 2018·Environmental Science and Pollution Research International·Xiaobiao ZhuLujun Chen
Jul 30, 2020·The Science of the Total Environment·Yufei ShiJinju Geng
Mar 9, 2018·Chemosphere·Meng Wang, Yinguang Chen

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