The Use of Hydrogen Peroxide and Hydrazine Sulfate for Removal of Chromium from Electroplating Effluents

Abstract:

The use of hydrogen peroxide and hydrazine sulfate for the treatment of chrome-containing rinsing waters of galvanic production of machine-building enterprises is proposed. The process of reducing chromium (6+) to (3+) from rinsing waters with a concentration of 8.55 mg/dm³ was studied. These reagents allow reducing more than 99% of chromium (6+) to chromium (3+) and maintaining a low salt content of treated wastewater. The consumption of hydrogen peroxide is 1.5 mg/dm³, and the consumption of hydrazine sulfate is 10 mg/dm³. The current situation in the treatment of galvanic wastewater leads to pollution of the environment with dangerous substances (CN^-, Cr⁶⁺, F^-, Cd²⁺), irrational use of raw materials and significant economic losses. The possibility of extracting valuable components from wastewater, in order to recycle them and return the treated water to production, is considered. Hydrogen peroxide is effective for treating acidic wastewater, and hydrazine sulfate can be used for both acidic and alkaline wastewater. Removal of excess hydrogen peroxide from the solution after reduction of chromium (6+) before precipitation of chromium (3+) hydroxide is required. The toxicity of hydrazine compounds must be taken into account.

• Periodical: Solid State Phenomena (Volume 316)
• Pages: 655-660
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.316.655
• Online since: April 2021
• Authors: Y.V. Anikin, Olga Yu. Makovskaya*, V.I. Shilkov
• Keywords: Chromium, Electroplating Effluent, Hydrazine Sulfate, Hydrogen Peroxide, Reduction, Wastewater

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