Photo-Fenton process for treating biological laboratory wastewater containing formaldehyde

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Published: Mar 29, 2010
DOI: https://doi.org/10.26850/1678-4618eqj.v35.1.2010.p25-33
Keywords:
laboratory wastewater treatment, formaldehyde, photo-Fenton

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Janaina Conrado Lyra da Fonseca
Universidade Estadual Paulista, São Paulo, Brasil.
Raquel Fernandes Pupo Nogueira
Universidade Estadual Paulista, Instituto de Química, Araraquara, Brasil.
https://orcid.org/0000-0003-1237-4571
Mary Rosa Rodrigues de Marchi
Universidade Estadual Paulista, Instituto de Química, Araraquara, Brasil.
https://orcid.org/0000-0001-5381-249X

Abstract

Laboratories consume great amounts of hazardous chemicals substances and consequently generate wastewater containing them, for example formaldehyde. This substance is widely utilized to preserve biological samples generating many liters of this residue every year. The present work proposes the use of the photo-Fenton process to treat formaldehyde wastewater using sunlight irradiation. Some aspects were investigated such as the iron source, sample and hydrogen peroxide concentration and also the use of stirred systems. The use of ferrioxalate (0.5 mmol L-1) improved the efficiency of the process in relation to the use of iron nitrate, while at least 1.0 mol L-1 H2O2 is necessary to treat the sample of the 500 mg C L-1. Under these conditions, every formaldehyde detectable was degradeted and 89% of the dissolved organic carbon was removed in two hours of exposure to sunlight. These results are satisfaction considerate for São Paulo State Environmental Agency.

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How to Cite
da Fonseca, J. C. L., Pupo Nogueira, R. F., & de Marchi, M. R. R. (2010). Photo-Fenton process for treating biological laboratory wastewater containing formaldehyde. Eclética Química, 35(1), 25–33. https://doi.org/10.26850/1678-4618eqj.v35.1.2010.p25-33
Issue
Vol. 35 No. 1 (2010): Eclética Química
Section
Original articles
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