E3S Web Conf.
Volume 247, 2021International Conference on Efficient Production and Processing (ICEPP-2021)
|Number of page(s)||4|
|Published online||05 April 2021|
Wastewater Treatment from Galvanization Industry with Zinc recovery
1 Department of Industrial and Information Engineering and Economics, University of L’Aquila, 67100 L’Aquila, Italy
2 Department of Chemical Engineering, Voronezh State University of Engineering, 394036 Voronezh, Russia
* Corresponding author: firstname.lastname@example.org
The resistance of steel to corrosion is obtained with a number of industrial processes based on Zn galvanization. However, all these methods bear a relatively high price tag due to the cost of Zinc plates and electrolytes as well as the formation of hazardous wastewaters containing metals and acids. Wastewaters from Zn galvanization may be grouped into two main types: Mix of Rinse Water (MRW) and Spent Pickling Solutions (SPS). Ordinarily, these waters are mixed and sent for treatment by precipitation. As a result large volumes of galvanic sludge is formed, containing iron, calcium, sulphates and a relatively small quantity of zinc (<20 %), which makes Zn recovery not profitable. The experimental results presented in this article show that it is possible to use as a coagulant to treat the process wastewaters the spent pickling solution (SPS) from the process, kept separated and added with sodium hydroxide. This results in obtaining precipitates with Zn contents higher than 40%, which brings the further advantage of making Zn recovery profitable.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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