中文摘要：

为探讨低碳氮比污水厂尾水的深度脱氮除磷技术，以自制新型缓释碳源、海绵铁和活性炭作为反硝化生物滤池的复合填料，在不同HRT和进水硝态氮浓度条件下，探究反硝化系统的深度脱氮除磷效果。结果表明，复合填料反硝化系统具有较高的同步脱氮除磷效率。当HRT为3．65h时，对TN和TP的平均去除率分别可达到85．7％和93．37％，出水COD平均浓度为29．2mg／L；在3个月的连续运行期间未出现明显的填料层堵塞及亚硝态氮和氨氮积累的现象；系统具有稳定pH值的能力，出水pH值无显著升高且趋于中性。该新型缓释碳源耦合海绵铁复合填料作为反硝化滤池的生物载体时．具有脱氮除磷效果好、无需连续投加碳源、出水oH值稳定等特点．

英文摘要：

To investigate the advanced nitrogen and phosphorus removal techniques in the treat- ment of wastewater treatment plant （WWTP） secondary effluent with low C/N ratio, the denitrification biological filter with a new slow-release organic carbon source （SOC-F）/sponge iron/activated carbon media was tested. The system was operated under different HRT and influent nitrate nitrogen concentra- tions. The results indicated that the denitrification system with composite media achieved a high efficiency in simultaneous denitrification and phosphorus removal. Under the condition of HRT = 3.65 h, the aver- age removal rate of TN and TP reached 85.7% and 93.37% , respectively, and the average COD in ef- fluent was 29.2 mg/L. During the three-month continuous operation, the filter was seldom clogged ; nei- ther were there accumulation of nitrate nitrogen nor ammonia nitrogen. The system demonstrated the abili- ty of stabilizing pH, since there was no significant pH increase in the effluent, which shifted to pH neu- tral. In conclusion, as the bio-film carrier of denitrifieation filter, the new slow-release organic carbon source coupling sponge iron as composite media exhibited the features such as high efficiencies in denitri- fication and phosphorus removal, needless of additional carbon source, and stabilization of effluent pH.