The denitrification characteristics of novel functional biocarriers immobilised by non-dissolved redox mediators

This study investigated the denitrification characteristics and practical applications of PET–CAs (chloroanthraquinones immobilised on polyethylene terephthalate), which are novel functional biocarriers. The PET–CAs were characterized using Fourier transform infrared spectroscopy (FT-IR) and energy dispersive spectrometry (EDS). Among the PET–CAs, PET-1,8-DCA (PET modified by 1,8-dichloroanthraquinone) was the best functional biocarrier for accelerating the denitrification process with approximately 0.14   mmol anthraquinone. The denitrification process was pseudo-zero order, with C NO3 −   =   175.64–19.28   t and R 2   =   0.9715. The pH of the PET-1,8-DCA system increased and ultimately reached 9.7. The stabilized ORP value with PET-1,8-DCA was approximately 70   mV lower than that of the control with PET . This study explored a novel design concept for the immobilization of quinone.