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Article

Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid

1
Department of Chemical Engineering and Materials, Universidad Complutense de Madrid, Av. Complutense s/n, 28040 Madrid, Spain
2
Department of Mechanical, Chemical and Industrial Design Engineering, ETSIDI, Universidad Politécnica de Madrid, Ronda de Valencia 3, 28012 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Water 2020, 12(6), 1567; https://doi.org/10.3390/w12061567
Received: 8 May 2020 / Revised: 27 May 2020 / Accepted: 28 May 2020 / Published: 30 May 2020
(This article belongs to the Special Issue Water Pollution and Sanitation)
Formaldehyde is a recalcitrant pollutant, which is difficult to remove from wastewater using conventional and advanced treatments. The objective of this research was to remove the organic matter from formaldehyde from an industrial wastewater, achieving its total mineralization and allowing the reuse of the water. The treatment was based on the reaction of formaldehyde with nitric acid, which was first studied and modelled with synthetic waters. Results show that it was possible to almost completely mineralize the formaldehyde (>95% TOC removal) at the best conditions studied (1.72 M of nitric acid and 85 °C of temperature). The addition of NaNO2 accelerated this reaction; however, after 2 h of reaction time, its effect was negligible at the maximum concentration of HNO3 studied. The results obtained with industrial wastewater fit well with the model. It is concluded that formaldehyde in actual wastewaters can be successfully removed through direct mineralization with nitric acid, under selected conditions. View Full-Text
Keywords: formaldehyde; mineralization; modelling; industrial wastewater treatment; nitric acid; reaction mechanism formaldehyde; mineralization; modelling; industrial wastewater treatment; nitric acid; reaction mechanism
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MDPI and ACS Style

Merayo, N.; Balea, A.; Tejera, J.; Garrido-Escudero, A.; Negro, C.; Blanco, A. Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid. Water 2020, 12, 1567. https://doi.org/10.3390/w12061567

AMA Style

Merayo N, Balea A, Tejera J, Garrido-Escudero A, Negro C, Blanco A. Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid. Water. 2020; 12(6):1567. https://doi.org/10.3390/w12061567

Chicago/Turabian Style

Merayo, Noemi, Ana Balea, Javier Tejera, Amalio Garrido-Escudero, Carlos Negro, and Angeles Blanco. 2020. "Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid" Water 12, no. 6: 1567. https://doi.org/10.3390/w12061567

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