Calculation of Reverse Osmosis and Nanofiltration Membrane Facilities to Process Solid Waste

It is discussed that landfill waste contains high concentrations of ammonia that can reach 2500 ppm values. To produce water that meets discharge regulations, two or three reverse osmosis treatment stages are required. At the same time, due to the high salt content and chemical oxygen demand (COD) values, membrane performance is very low. In order to reduce the cost of membrane devices, the possibility of using nanofiltration membranes during the first stage of purification has been investigated. Experiments have been carried out to determine the change in the concentration of dissolved impurities in the filtrate of membrane devices and a decrease in the performance of membranes in the process of processing solid waste filtrates and reducing the consumption of concentrate. The main dependences have been obtained, which make it possible to determine: the minimum possible consumption of the concentrate, the required reduction factor for the consumption of the source water, depending on the concentration of ammonium in the source water.