Automatic control of the methionine extraction process from food enterprises wastewater

Abstract

The process of methionine extracting from food enterprises wastewater by ion exchange sorption was studied in work. The optimal conditions for conducting the process of sorption and desorption of methionine on polycondensation cation exchanger KU-5 were determined. The maximum coefficient of ion-exchange equilibrium from aqueous salt solutions in a strongly acidic medium (pH 2) at the sodium sulfate concentration in the equilibrium solution of 2.1 mg-Eq/ml was determined by the analysis of the isotherms of methionine sorption in the sodium form of the KU-5 cation exchanger. Methionine desorption was carried out with a 1% NaOH solution, which allowed crystalline methionine being extracted from the eluate at pH 6.5 at room temperature, this crystalline methionine meeting the requirements of regulatory documentation. An automatic control scheme where the adsorber operates in a closed cycle: sorption–acidic wastewater displacement–desorption and activation of cation exchanger–regenerating solution displacement–sorption, was proposed to optimize the process. The method allows additional measurement of the modes and changing the equipment parameters depending on the rational parameters of the sorption/desorption. This approach allows complete extraction of the target component from wastewater, as well as increases the sorbent use completeness and energy and resource-saving at the enterprise.