Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Wastewater with a low carbon/nitrogen (C/N) ratio is widespread and difficult to treat. The addition of an external carbon source effective method for treating such wastewater. Therefore, we aimed prepare self-releasing biofilm carrier using agricultural waste (corncobs), polyvinyl alcohol, sponge iron in various ratios provide that would facilitate denitrification, providing optimal environment microorganisms. We found the release MAC accumulated over 60 d was 116.139 mg chemical oxygen demand (COD)·g−1, whereas total nitrogen approximately 0 mg·(g·d)−1. NO3−-N removal rate after 24 h reached 98.1%, theoretical use (in terms COD) stable at 90.34%. In addition, sum abundances denitrifying cellulose-degrading bacteria 49.89%. Furthermore, carriers are used as functional contribute cellulose degradation, process which produces Fe2+ electron donors shuttles forms cycle, thereby inducing increase microbial abundance; this then facilitates degradation synergistic denitrification through interspecific bacterial cooperation. This study provides new enhancing wastewater C/N ratios.