反硝化生物滤池深度脱氮机理  

Denitrification biological filter as tertiary treatment for nitrogen removal

作　　者：孙迎雪[1] 胡银翠[1] 孙云祥[2] 邵一如[1] 

机构地区：[1]北京工商大学环境科学与工程系,北京100048 [2]北京城建设计研究总院有限责任公司,北京100037

出　　处：《环境工程学报》2012年第6期1857-1862,共6页Chinese Journal of Environmental Engineering

基　　金：北京市教育委员会科技计划面上项目(KM201210011004);国家水体污染控制与治理科技重大专项(2008ZX07209-007)

摘　　要：研究了反硝化生物滤池对污水中硝酸盐氮的脱氮机制及其影响因素。结果表明,在实验室小试条件下,反硝化生物滤池启动14 d后出水基本达到稳定,NO3--N和TN的去除率分别为80%～88%和76%～80%,COD的去除率达到80%以上。稳定运行期,在室温20～29℃、水力负荷为1.5～2 m3/(m2.h)、COD/TN为3.7～4.5的条件下,反应器对NO3--N和TN的去除率分别为70%～85%和47%～64%,且在运行过程中出现了少量NO2--N的积累。分析反硝化生物滤池沿水流方向有机物浓度及氮形态分布发现,沿水流方向NH4+-N浓度基本保持不变;NO2--N浓度在滤层底部至40 cm高处积累较为明显,其后浓度基本不变。The mechanism of nitrogen removal from wastewater by denitrification biological filter （DNBF） and the related influencing factors were investigated. The results showed that the start - up period of the DNBF was performed when ran after 14 days, and the removal efficiencies of NO3- -N and TN were 80% -88% and 76 - 80% ,respectively, while the removal efficiency of COD was over 80% in the laboratory-scale experiments. In stable running period of the DNBF reactor, the removal efficiency of NO3--N and TN kept stable with the removal efficiency of 70% - 85% and 47% - 64% , respectively, when the water temperature was 20 - 29℃ , hydraulic loading was 1.5 -2 m3/（ m2 h） , and C OD/TN was 3.7 -4.5. Meanwhile, a little NO2--N accumulated in the effluent of DNBF. The level of NH4-N was approximately unchanged through the filter, while the level of NO2--N accumulated from the bottom to 40 cm of the filter layer, and then kept stable.

关 键 词：生物滤池 深度处理 生物膜 反硝化作用 生物脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]