A complex for deep reagent-free treatment of industrial wastewater using only physical and chemical methods has been developed. Removal of organic impurities is ensured by deep anodic oxidation, and deposition of the bulk of polyvalent metals in the form of oxyhydrates and basic carbonates - by alkalinization to the optimal pH value of wastewater by catholyte of electromembrane apparatus. Additional treatment of decontate is carried out by the method of continuous ion exchange with autoregeneration of filter load. For deep water pretreatment before discharge a filter-garanter with highly selective to polyvalent metal ions complexing ionite is provided. Tests on real wastewater of some industrial enterprises of St. Petersburg showed that the developed technology provides obtaining water with statutory normative indicators.
The data on the stationary concentration of polyvalent metal ions and the working exchange capacity show that complex-forming ion-exchangers are the most suitable ion-exchangers for treatment of industrial effluents from the rated impurities. A technology for regeneration of ion-exchange resins is developed which ensures the obtaining of released impurities in the form of a slurry, safe for long-term storage and disposal.
