Application of micro- and ultrafiltration at the stage biological treatment, tertiary sewage treatment

Purpose. Today is an issue of water resources in various countries around the world, including in Ukraine. This is due to various factors - changes in weather conditions, the depletion of aquifers, water quality changes in the sources of supply, reduction of freshwater. The aim of this work is to find new, more modern, efficient wastewater treatment, allowing to obtain the best possible cleaning effect on the BOD, COD, nitrogen and phosphorus compounds, retrieve and dispose of useful components to prevent water pollution and to minimize the consumption of fresh water. Methodology. An alternative technology tertiary sewage treatment of phosphates on the modified ultrafiltration membranes pressure. When this is used for the surface modification of aluminum oxychloride, which is dispensed during operation of the plant, that allows to bind phosphate and the resulting modified support layer in equilibrium. An alternative technology with multi-stage biological treatment is additional purification membrane biological technology using a membrane bioreactor. Findings. Decrease in pore diameter allows for more efficient removal of nutrients and constant dosing coagulant also increases the efficiency of the removal of phosphates. Surface modification is accomplished by gelling at the membrane surface on the basis of crystallisation to form a solid phase, precipitating from the solution applied to the membrane. Optimal coagulant dosage range was experimentally determined in the range of 15 to 30 mg / l. Originality. The proposed technology tertiary sewage treatment on the basis of modified ultrafiltration pressure membranes can effectively remove nutrients, and a constant supply of coagulant solution to ensure the removal of phosphates. Practical value. The resulting method of post-treatment can be recommended for use in wastewater treatment plants with full biological treatment, which run on the partial oxidation of organic substances.