Landfill leachate is currently recognized as a source of serious environmental danger. Reverse osmosis is an effective method for treating landfill leachate to comply with wastewater discharge standards. However, this technology generates a significant volume of concentrated waste, which is expensive to manage. This research explores methods for producing high-quality water suitable for industrial applications or discharge into surface water sources while minimizing the concentrate output. The findings demonstrate the potential to drastically reduce concentrate flow to a mere 3-4% of the initial feed water volume. According to developed technology, concentrate is hidden in the sludge transported to the landfill. Is achieved due to application of the developed «ion separation» technology. The presented technology allows to reduce concentrate discharge to economically reasonable values to apply evaporation or withdrawal of concentrate by motor transport. It is possible to achieve a reduction in concentrate consumption by changing the ratio of concentrations of salt ions and organic substances. Such separation of concentrate solution can be implemented due to the duse of membranes with different rejection of divalent ions and organics. The achieved separation of the concentrate solution enables us to significantly reduce the costs of its utilization.
Ширкова et al. (Thu,) studied this question.