RESEARCH OF EFFICIENCY OF A TWO-STAGE MEMBRANE TREATRMENT OF THE SURFACE INDUSTRIAL AND STORM WASTEWATER

Abstract

The aim of the study was to determine the rational technological scheme of multi-stage reverse osmosis for obtaining maximum treatment degree of mentioned wastewater. The sewage of «Krasnyi Bor», one of the largest toxic industrial waste landfill in the country, was used to conduct the study. Membrane reverse osmosis method was used for sewage treatment. The results demonstrate that preliminary traditional sewage processing including the barbotage, sludging, alkalization, filtration through granular layer and subsequent one-stage reverse osmosis was insufficient to get the normal cleaning. Therefore, two-stage consistent scheme of reverse osmosis processing including the several preliminary physico-chemical treatment was pro-posed. Combination of physico-chemical technology and two-stage reverse osmosis treatment of «Krasnyi Bor» sewage allows obtaining the indicators corresponding with limits of water disposal into natural waters. Intermediate reactant treatment, which is usually not used in traditional treating facilities, significantly affected results of sewage treatment. In addition the two-stage alkalization demands 25% - 32% NaOH less than the one-stage, giving the higher degree of sewage treatment.