Treatment of Wastewater Resulting from the Metallic Coatings Process

  • Tamara RADU "Dunarea de Jos" University of Galati
Keywords: cleaning surfaces, rinse waters, alkaline water, acid water, neutralization

Abstract

The technological cleaning processes of steel strip surfaces used in metal coatings require organic or inorganic chemicals with a high risk of toxicity. To avoid pollution, the water resulting from these processes must be neutralized.
During the degreasing process, alkaline solutions containing caustic soda (NaOH), tri-sodium phosphate (Na3PO4) and detergents are used and the pickling process is made in 15-20% HCl solution. Rinse waters resulting from these operations will have an alkaline pH respectively acid pH, with values depending on the duration of use or refresh solution.
Neutralization was done with sulfuric acid solutions for alkaline water and sodium hydroxide solutions for acid water. The research aimed to establish the optimal conditions for neutralization and the optimal reagent consumptions.

Creative Commons License

Downloads

Download data is not yet available.

References

[1]. ***, Treatment of wastewater from electroplating, metal finishing and printed circuit board manufacturing, California State University, Sacramento Department of Civil Engineering Office of Water Programs.
[2]. Maria Vlad, Tamara Radu, Olga Mitoseru, Florentina Potecasu, Environment Quality Improvement at Hot-dip Galvanisation and the Recycling of Zinc By-products, Journal of Environmental Protection and Ecology, 12, No 3A, p. 1415-1423, 2011.
[3]. Maria Vlad, Gelu Movileanu, Tamara Radu, Lucica Balint, Recycling of zinc by products, 11th International Multidisciplinary Scientific GeoConference, SGEM 2011, Proceedings, vol. 3, p. 875-882, 2011.
[4]. Tamara Radu, Anisoara Ciocan, Maria Vlad, Simion Ioan Balint, Viorel Dragan, Environmental risk assessment in the galvanizing of steel sheets, 12th International Multidisciplinary Scientific GeoConference, SGEM 2012, Proceedings, vol. 5, p. 391-397, 2012.
[5]. ***, www.ebrd.com.
[6]. ***, www.blog-en.condorchem.com.
[7]. Marcos von Sperling, Biological Wastewater Treatment Series, vol. 2, IWA Publishing, London, 2007.
[8]. Metcalf and Eddy, Wastewater engineering: treatment and reuse, McGraw Hill, 4th ed., p. 1819, 2003.
[9]. Metcalf and Eddy, Wastewater engineering: treatment, disposal and reuse, Metcalf & Eddy Inc., 3 th ed., p. 1334, 1991.
[10]. Elson R., Shaw R. J., Wastewater treatment options, in Running Water, p. 41, IT Publications, London, 1999.
[11]. ***, www.lboro.ac.uk.
Published
2016-06-15
How to Cite
1.
RADU T. Treatment of Wastewater Resulting from the Metallic Coatings Process. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science [Internet]. 15Jun.2016 [cited 28Mar.2024];39(2):5-. Available from: https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/1258
Section
Articles

Most read articles by the same author(s)