两级同步硝化反硝化工艺处理低碳氮比壤中流

Two-stage Simultaneous Nitrification and Denitrification Process for Treatment of Low Carbon to Nitrogen Ratio Interflow

针对山地丘陵地区简易填埋场壤中流总氮(TN)浓度高且碳氮比(C/N)低、给周边环境带来持续污染问题,采用两级同步硝化反硝化(SND)反应器处理模拟壤中流,并探索了不同C/N(2.3、2.0、1.7、1.5和1.3)下反应器的脱氮性能。结果表明,反应器能在25 d内迅速启动,并在1.5~4.0的C/N下稳定运行,其间反应器外环的总氮容积负荷(NLR)为0.17~0.56 kg/(m^(3)·d),内、外环可通过功能互补应对冲击负荷。C/N在1.5及以上时,反应器的总氮去除率稳定在(85.69±2.22)%。C/N为2.0和1.7时,反应器的同步硝化反硝化率(RSND)分别为71.83%和51.75%,表明同步硝化反硝化在壤中流脱氮中具有重要贡献。此外,好氧反硝化和全程反硝化可能也在脱氮过程中占重要地位。

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/(m^(3)·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.