RULing-yu,LIUHeng-yi,LILei,et al.Two-stage Simultaneous Nitrification and Denitrification Process for Treatment of Low Carbon to Nitrogen Ratio Interflow[J].China Water & Wastewater,2022,38(21):84-92.
Two-stage Simultaneous Nitrification and Denitrification Process for Treatment of Low Carbon to Nitrogen Ratio Interflow
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第21期
Page:
84-92
Column:
Date of publication:
2022-11-01
- Keywords:
- simultaneous nitrification and denitrification; low carbon to nitrogen ratio; interflow; mountainous and hilly areas
- Abstract:
- Simple landfill interflow with high total nitrogen (TN) and low carbon to nitrogen (C/N) ratio in mountainous and hilly areas can cause continuous pollution to the surrounding environment. To solve the problem, a two-stage simultaneous nitrification and denitrification (SND) reactor was employed to treat simulated interflow, and the nitrogen removal performance of the reactor under different C/N ratios (2.3, 2.0, 1.7, 1.5 and 1.3) was investigated. The reactor was rapidly started within 25 days and remained stable at C/N ratio of 1.5-4.0. During this period, the nitrogen loading rate (NLR) of the reactor was 0.17-0.56 kg/(m3·d), and the inner and outer rings were capable to withstand the shock load through functional complementation. When C/N ratios were greater than or equal to 1.5, the removal rates of total nitrogen stabilized at (85.69±2.22)%. When C/N ratios were 2.0 and 1.7, the simultaneous nitrification and denitrification rates (RSND) of the reactor were 71.83% and 51.75%, respectively, indicating that simultaneous nitrification and denitrification had an important contribution to nitrogen removal from the interflow. In addition, aerobic denitrification and complete denitrification might also play important roles in the process of nitrogen removal.
Last Update:
2022-11-01