MODELING OF WASTEWATER TREATMENT FROM SURFACTANTS USING SORBENTS BASED ON WASTE FROM WATER TREATMENT PLANTS

Methods of mathematical and physical modeling of the process of adsorption of wastewater treatment of industrial enterprises related to chemical technology are considered. For wastewater treatment from anionic synthetic surfactants and mathematical modeling of the adsorption process, the use of sorption material in the form of waste from water treatment plants, which are sludge after clarifiers at thermal power plants, has been developed and experimentally investigated. Mathematical models are presented for both engineering calculations and numerical investigation of the adsorption process. A system of partial differential equations is written for the balance of the mass of the component, the kinetics of adsorption with equilibrium conditions (isotherms of adsorption). For engineering calculations of the adsorbent, the equation of mass transfer and material balance is presented, where the desired value is the surface of the adsorbent. It is noted that experimental data on adsorption kinetics and equilibrium are needed to apply these models. The carbonate sludge of Kazan CHPP - 1 was used for experimental studies. The physicochemical characteristics of the sludge were determined: bulk density, ash content, moisture capacity and pH of the medium. Experimental data have been obtained on the extraction of sodium lauryl sulfate, which is a surfactant entering wastewater from various enterprises. A pattern of decreasing surface tension at the interface between air and solution phases has been established with an increase in the concentration of the extracted surfactant component. A graphical dependence of the surface tension on the concentration of sodium lauryl sulfate in solution is presented. Sorption isotherms for the proposed sorbent have been obtained, which belong to the first type according to the Brunauer-Emmett-Teller classification. Experimental data can be used both in numerical modeling of surfactant adsorption and in engineering methods for calculating wastewater treatment plants.