Waste water treatment of industrial enterprises - technically complex task that requires an integrated approach and the application of modern technologies, such as ozonation, membrane treatment methods (microfiltration, ultrafiltration and reverse osmosis), modern chemical purification methods, etc. Complexity of the problem related to the fact that high concentrations of impurities, the instability of their composition and extremely strict quality requirements of treated water make traditional approaches (traditional coagulation, flotation, sedimentation, filtration through sand load) virtually ineffective.
Modern waste water treatment plant is developed on the basis of detailed laboratory analysis of water. Difficult cases may require a test treatment of waste water samples using the laboratory or pilot plant that correctly reproduces all the necessary stages of water treatment, such as pre-filtration, ozone stimulated chemical purification, micro and ultrafiltration, reverse osmosis, the final purification of waste water with ozone, sludge concentration etc..
A research division of our company has developed a comprehensive technology for deep waste water purification that utilizes the effect of coagulation of dissolved organic and inorganic impurities stimulated by ozonization. The principle of the technology is that the salt of ferrous iron is placed into water that is then fed into the contact tank, where its being exposed to ozone during necessary time. In doing so, soluble ferrous iron is oxidized to a fine-dispersed colloidal particles of insoluble ferric iron. Because of their tiny dimensions, these particles have a huge specific surface and powerful catalytic and sorption effects, which allow them to grabs the organic and inorganic impurities. This process looks like traditional coagulation. The principal difference consists precisely in that the surface of colloidal iron oxide particles formed during ozonization on many orders greater than the surface of the particles produced during hydration. Multiple enlargement of the surface of absorbent particles in combination with the catalytic activity of iron oxide leads to amazing results. It dramatically increases the effectiveness of adsorption of a range of commonly encountered and hard-to-remove contaminants such as organic and organochlorine compounds, phosphates, etc. Then water passes an ultrafiltration stage, where the colloidal iron oxide particles are trapped along with adsorbed impurities and in the process of washing of the membrane, go into a sludge. Such a method of filtering is an important part of the method. This is due, firstly to the fact that the size of the colloidal particles are so small that their removal is only possible with the use of ultrafiltration. Secondly, the adsorption of impurities by colloidal iron oxide particles is a reversible process and it's important to get rid of them fast enough. Therefore, ultrafiltration membrane that washed more frequently than granular filters is an ideal option.