Effect of catalytic ozonation on the TOC removal and anions separation treating coal chemical brine by nanofiltration membranes

摘要

This study explored the performance of catalytic ozonation hybrid two-stage nanofiltration (NF) membrane processes treating the coal chemical brine which has high levels of salinity and organic pollutants. A novel catalyst composed of waste coal fly ash and biogas residues was used in catalytic ozonation, which led organic compounds concentrated in a smaller molecular weight distribution. It was observed that flux of catalytic ozonation hybrid two-stage NF membranes was 1.9 times higher than two-stage NF membrane after 15 h operation. Meanwhile, the total organic carbon (TOC), SO42-, and Cl-1 removal efficiencies of catalytic ozonation hybrid two-stage NF membranes increased by 24%, 12%, and -11%, contrast to the only two-stage NF membranes and it significantly improved the NF performance of the TOC removal and anions separation. And the results offered new insights for sustainable use of waste sources.