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Formation of new disinfection by-products of priority substances (Directive 2013/39/UE and Watch List) in drinking water treatment

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Abstract

The degradation of priority substances (Directive 2013/39/UE and Watch List) by chlorine dioxide (ClO2) and the formation of disinfection by-products (DBPs) in a drinking water treatment plant (DWTP) located near Barcelona (NE Spain) were investigated. For the first time, the reactivity with ClO2 of several compounds frequently found at the entrance of the DWTP such as erythromycin, clarithromycin, chlorpyrifos, and imidacloprid was evaluated in both simulated and real conditions. To identify potential DBPs, experiments were performed at laboratory scale by simulating the operational disinfection conditions in the DWTP. Liquid chromatography coupled with high-resolution mass spectrometry (LC-HRMS) working in full scan and target-MS/HRMS modes was used for the identification of the generated DBPs. Several new DBPs were found, three from erythromycin, one from clarithromycin, two from chlorpyrifos, and one from imidacloprid. Then, the presence and behavior through DWTP treatment of priority substances and their DBPs were investigated in order to evaluate their generation in real working conditions. Two of the potential DBPs, anhydroerythromycin, and N-desmethyl clarithromycin were already identified in the raw water of DWTP, but N-desmethyl clarithromycin was also generated after the chlorine dioxide treatment step. Both compounds were eliminated by the treatments applied in the DWTP; anhydroerythromycin was eliminated after ozonation in the upgraded conventional treatment and after reverse osmosis in the advanced treatment while N-desmethyl clarithromycin is recalcitrant in the upgraded conventional treatment, but it was eliminated by reverse osmosis.

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Acknowledgments

A.R. gratefully acknowledges the support and help of Juan Francisco Ayala and Raquel Seró.

Funding

The authors thank the support of Pla de Doctorats Industrials (2013 DI 017) and also the project 2017-SGR-0310, both from the Generalitat de Catalunya. They are also very grateful for the financial support from the Spanish Ministerio de Economia y Competitividad under project CTQ2015-63968-C2-1P.

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Correspondence to Encarnación Moyano.

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Responsible editor: Ester Heath

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Rubirola, A., Boleda, M.R., Galceran, M.T. et al. Formation of new disinfection by-products of priority substances (Directive 2013/39/UE and Watch List) in drinking water treatment. Environ Sci Pollut Res 26, 28270–28283 (2019). https://doi.org/10.1007/s11356-019-06018-9

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  • DOI: https://doi.org/10.1007/s11356-019-06018-9

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