Issue 6, 2022

Elimination of micropollutants by the solar/chlorine process: contribution of reactive species and formation risk of NDMA

Abstract

Diuron, a persistent organic herbicide, was effectively degraded by the solar/chlorine process in this study. The solar/chlorine process could not only produce HO˙ (hydroxyl radicals) and reactive chlorine species (RCS), but also O3. They are the major contributors to diuron degradation at different solution pH values (6–8). Natural organic matter (NOM), NO2 and a high dosage of Cl, NO3, and HCO3 could inhibit the efficiency of diuron degradation. Moreover, a possible degradation pathway of diuron was proposed, which gives detailed reactions in the solar/chlorine process. The co-existence of NO2 in diuron degradation has risks of producing N-nitrosodimethylamine (NDMA). Finally, the ecotoxicity of diuron and its oxidation byproducts was reduced overall according to the calculated results from the Ecological Structure Activity Relationships (ECOSAR) program. But the toxicity of the products is still very high. For that, the solar/chlorine process should be of concern when it is used for diuron degradation.

Graphical abstract: Elimination of micropollutants by the solar/chlorine process: contribution of reactive species and formation risk of NDMA

Supplementary files

Article information

Article type
Paper
Submitted
30 déc. 2021
Accepted
18 mars 2022
First published
26 mars 2022

Environ. Sci.: Water Res. Technol., 2022,8, 1252-1260

Elimination of micropollutants by the solar/chlorine process: contribution of reactive species and formation risk of NDMA

W. Zhang, N. Li, C. Wang, G. Li, J. Sun and S. Zhu, Environ. Sci.: Water Res. Technol., 2022, 8, 1252 DOI: 10.1039/D1EW00965F

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