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This work is devoted to the study of the process of water purification by galvanic coagulation. It is known that this method is promising for the extraction of toxic contaminants such as heavy metals from wastewater. However, there are no techniques or mathematical dependencies to simulate the treatment process. The paper investigated the chemical side of galvanic coagulation, and also proposed a mathematical model based on a two-stage chemical reaction model and a metal electrochemical corrosion model.