To improve the quality of the tailings water from a wastewater treatment plant(WWTP),a denitrification biofilter(DNBF)with a composite filler composed of a new slow-release organic-carbon source(SOC-F),sponge iron,and activated carbon was tested.Studies were conducted in the combined process of DNBF-O_3-GAC to explore the efficiency of the advanced removal of nitrogen,phosphorus,and microbial metabolite by using synthetic effluent made from running water and chemicals.Corresponding comparative studies were ...