Effect of the degradation of different dissolved NOM fractions by the heterogeneous Fenton treatment on the emergence of trihalomethanes and haloacetic acids at drinking water treatment plants

Galeano, Luis-Alejandro Y Cotazo Mosquera, Omar J. Y Gomez, Viviana A. Y Torres, Ricardo A. Y García-Mora, Ana M. (2025) Effect of the degradation of different dissolved NOM fractions by the heterogeneous Fenton treatment on the emergence of trihalomethanes and haloacetic acids at drinking water treatment plants. Journal of Water Process Engineering, 71 (107335).

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Resumen

Hydrophobic, hydrophilic, and transphilic fractions of natural organic matter, which are all present in drinking water treatment plants, can play a crucial role on the formation of disinfection by-products after chlorination. In this work, catalytic wet peroxide oxidation (heterogeneous-Fenton) activated by an aluminum/iron-pillared clay catalyst, was tested as an alternative to remove different organic fractions and evaluated its effect on disinfection by-products formation in several stages of two full-scale drinking water treatment plants in Narino˜ (Colombia). The advanced treatment removed 87 % hydrophobic, 36 % hydrophilic, and 70 % transphilic fractions in raw water with mostly hydrophobic character, while in the hydrophilic case, it was removed 47 % hydrophobic, and 40 % hydrophilic fractions. Interestingly, formation of trihalomethanes was reduced in up to 81 %, and haloacetic acids in up to 83 %. Also, the process significantly degraded high (~661 kDa) and low (~6.2 kDa) average molecular weight hydrophobic fractions into lighter, but less disinfection by-products forming ones. Meanwhile, the high average molecular weight (~1000 kDa) hydrophilic fraction was instead transformed into a lighter fraction (<3 kDa). The process showed to be highly efficient to degrade natural organic matter with different polar nature at room temperature and natural pH. However, the application of this treatment on the effluent of a conventional physicochemical unit (from hydrophilic water supply sources) must be avoided, since the residual organic content displayed higher potential for haloacetic acids formation. On the contrary, in hydrophobic water supply sources, it is recommended to apply the process at this point of treatment.

Tipo de Elemento:	Artículo
Palabras Clave:	Catalytic wet peroxide oxidation Natural organic matter Hydrophilic Advanced oxidation process Disinfection by-products
Asunto:	Q Ciencias > QD Chemistry
Division:	Facultad de Ciencias Exactas y Naturales > Programa de Química > Recursos digitales
Depósito de Usuario:	PhD Luis Alejandro Galeano
Fecha Deposito:	04 Jul 2025 22:26
Ultima Modificación:	04 Jul 2025 22:26
URI:	http://sired.udenar.edu.co/id/eprint/15816

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