Study on Operation Parameters Optimization and Denitrification Efficiency of Deep-Bed Denitrification Filter

摘要

Some areas have raised discharge standards for effluent total nitrogen (TN) concentration in China. However, the main component of effluent TN in the wastewater treatment plant is nitrate nitrogen (NO_3~--N). This research focuses on TN removal using deep-bed denitrification filter, the hydraulic retention time (HRT) and influent C/N ratio are optimized at 25 °C and 10 °C. The optimum influent C/N of denitrification filter is 3:1 at 25 °C and 10 °C. The optimum HRT is 0.25 h at 25 °C and 1 h at 10 °C. Under the optimum conditions, the average concentration of effluent TN is 6.76 mg/L at 25 °C and 8.76 mg/L at 10 °C. The minimum carbon source addition and shortest HRT of deep-bed denitrification filter at room and low temperature were optimized, which has a practical significance in environmental engineering.