Wastewater Treatment from Aluminum Ions by Technogenic Carbonatecontaining Reagent

The possibility of using the technogenic waste of thermal power plants as a solid phase reagent for effective purification of aqueous solutions from aluminum ions under stationary conditions is shown. Al3+ model solutions with concentration from 100 to 1000 mg·l-1 are used to determine the features of the heterophase process and study the effect of the amount of reagent used, the contact time, temperature and concentration of the initial solutions on the degree of purification of solutions from Al3+. It is found that when choosing the conditions, the proposed reagent allows the aluminum ions to be converted to a solid phase to obtain solutions containing aluminum below the maximum permissible concentrations. Reagent consumption decreases with increasing process time, increasing temperature and decreasing the concentration of the solution to be cleaned. A method for wastewater treatment using a new reagent from aluminum ions to the MPC level was developed and successfully applied at the metal working enterprise. The precipitate obtained in the purification can be of interest as an aluminum concentrate. The economic and environmental benefits of using a new reagent for purification are compared with the use of traditional sorbents. The proposed purification method provides a comprehensive solution of important environmental problems: purification of water from cation-pollutants with simultaneous utilization of anthropogenic waste from thermal power plants.

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