SIMULATION OF THE OPERATION OF THE AUTOMATED SYSTEM FOR CONTROLLING THE REAGENT RECOVERY OF TOXIC IMPURITIES IN NON-FLOW CONDITIONS

Abstract

A method of automatic control of chromium-containing wastewater disposal parameters in a batch reactor mixer is proposed. The method consists in stepwise dosing of reagents into water to gradually reduce the redox potential (Eh) to the limit value with continuous maintenance of the value of the active reaction (pH) within specified limits. Reagent dosing is controlled by local regulators, the settings of which are determined for each stage and period of regulation. A mathematical model of a batch reactor-reactor as a control object with a variable structure and a method for the synthesis of local control systems for the parameters of Eh and pH have been developed. A mathematical model of the control system is constructed and simulation modeling of the hexavalent chromium extraction process is performed.