Improvement of Technological Modes of Electrodialysis Apparatus for Treatment of Chromium-Containing Waste Waters

Abstract

Waste waters of galvanizing plants contain toxic heavy metals what causes pollution of the environment and endangers it. The present study aim includes concentration of chromium (VI) ions from chromium plating waste waters, purification of waste water and its reuse for development of waste-free technological cycle. This study was carried out with the pilot electrodialysis apparatus designed by us and produced in the Institute’s engineering workshop using real plating rinse water of the plating shop. We received desalinated water which may be recirculated in rinsing bath and chromium salts concentrate which may be used in chromium plating bath after correction. Resulted the experiment, the ion-exchange membranes resistant to “poisoning” with chromium (VI) ions and stable in the process of regeneration were selected and the technological modes for stable operation of apparatus matched.

Keywords

• electrodialysis
• chromium (vi) removal
• ion-exchange membranes
• reuse of wastewater