Method for reducing risks of composite pollutants in sewage

A method for reducing risks of composite pollutants in sewage, comprising the following steps:

• S1, measuring a concentration CDOC of dissolved organic carbon and a total concentration CHCP of composite pollutants in sewage;
• S2, calculating a proportion P of a number of dissolved organic matter molecules with a modified aromaticity index AImod≥0.5 in sewage to a total number of dissolved organic matter molecules in sewage;
• S3, determining a filling ratio of two media in a dual-media adsorption column based on the ratio of the concentration CDOC of dissolved organic carbon to the total concentration CHCP of composite pollutants and the P, and then performing risk reduction treatment on the sewage by using the dual-media adsorption column;
• wherein determining the filling ratio of the two media in a dual-media adsorption column for adsorbing sewage based on the ratio of the concentration of dissolved organic carbon to the total concentration of composite pollutants and the P comprises:
• when CDOC/CHCP≤1000 and P≤20% in sewage, the filling ratio of the activated carbon to the confined water modified activated carbon is 1:1;
• when CDOC/CHCP≤1000 and P>20% in sewage, the filling ratio of the activated carbon to the confined water modified activated carbon is 2:1;
• when CDOC/CHCP>1000 in sewage, the filling ratio of the activated carbon to the confined water modified activated carbon is 4:1.