Biological denitrification with a novel biodegradable polymer as carbon source and biofilm carrier

► A novel biodegradable carrier composed of PHBV and PLA was prepared. ► The carrier could serve as biofilm carrier and carbon source for denitrification. ► The average nitrogen removal efficiency achieved 94.11%. ► DOC in the effluent finally drops to 1.19 mg/L. ► Kinetics study suggested TOC releasing is independent of denitrifying.