Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid

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Merayo Cuevas, Noemí and Balea Martín, Ana and Tejera Tejo, Javier and Garrido Escudero, Amalio and Negro Álvarez, Carlos Manuel and Blanco Suárez, Ángeles (2020) Modelling the Mineralization of Formaldehyde by Treatment with Nitric Acid. Water, 12 (6). p. 1567. ISSN 2073-4441

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Official URL: https://doi.org/10.3390/w12061567




Abstract

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.


Item Type:Article
Uncontrolled Keywords:formaldehyde; mineralization; modelling; industrial wastewater treatment; nitric acid; reaction mechanism
Subjects:Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Materials
ID Code:66801
Deposited On:06 Jul 2021 13:47
Last Modified:07 Jul 2021 06:50

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