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METHODS OF INTENSIFICATION OF IRON-CONTAINING NATURAL WATER PURIFICATION PROCESSES
Abstract
Investigation of methods for increasing the rate of oxidation of ferrous ions dissolved in natural water and developing techniques for obtaining high-dimensional agglomerates of oxidized iron particles, with the aim of improving the efficiency of separation processes. As a method of oxidation in processes of deironing of natural waters, aeration and oxygenation of air through ceramic membranes were chosen. The effectiveness of the aeration method of deironing is associated with the rate of oxidation of Fe II with air oxygen, namely, with the features of this reaction and the factors that affect the possibility of its occurrence. The nature of the dependence of the rate of oxidation of ferrous iron on the specific interface between the water-air phases is established. As the separation method, the filtration process was chosen on the same ceramic membranes as in the aeration stage. The filtration of water occurs through the ultra-thin pores of ceramic membranes. Ceramics include products from inorganic nonmetallic materials, such as natural (clay, kaolin, talc, spinel, carbonates, carbides) and technogenic (Al2O3, TiO2, MgO, CeO2, ZrO2, layered silicates, and their combinations, as well as metal carbides, Ba2Ti, etc.). Alumina (Al2O3) is widely used for the production of ceramic membranes, a particularly strong and chemically stable modification of which is Al2O3 (corundum). The filter is dynamic, its self-cleaning design allows the liquid to wash the membrane, which prevents accumulation of sediment and complete clogging of the pores. This choice is due to the high stability and strength of ceramic membranes to the impact of abrasive particles (sand, scale), microorganisms, temperature changes and pressures. The use of hydrodynamic devices will make it possible to intensify the oxidation processes preceding the filtration stage.
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