蚯蚓生态滤池对生活污水中氮的去除作用  

Nitrogen Removal in Earthworm Ecofilter Treating Domestic Wastewater

作　　者：方彩霞[1] 罗兴章[1] 郭飞宏[1] 郑正[1] 李喆钦[1] 

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,南京210093

出　　处：《环境科学》2010年第2期352-356,共5页Environmental Science

基　　金：江苏省太湖水专项(BS2007148);水利部公益性行业科研专项(200801028);国家水体污染控制与治理科技重大专项(2008ZX07101-004)

摘　　要：研究了单级蚯蚓生态滤池对生活污水中不同形态氮的去除效果,并对其机制进行了探讨.结果表明,处理前进水总氮以氨氮为主,占83.88%,出水总氮以硝态氮为主,占76.46%,氮素的形态在处理前后发生了很大的改变;系统对总氮和氨氮的平均去除率分别为28.08%和90.44%,硝态氮大量积累,亚硝态氮少量积累;系统硝化作用强,反硝化作用受到抑制,总体脱氮能力较差,可采取提高湿干比、改进滤池构造、多级滤池串联、后接人工湿地和提高进水碳氮比等手段强化反硝化,以提高滤池总氮的去除效果.The removal efficiency of different forms of nitrogen was studied in earthworm ecofilter treating domestic wastewater, and the mechanisms were discussed. Results indicated that, the major form of total nitrogen （TN） in influent water and effluent water were existed as ammonia-nitrogen （NH4^＋-N） and nitrate-nitrogen （NO3^- -N） , respectively. NH4^＋ -N/TN in influent water and NO3^- -N/TN in effluent water were 83.88% and 76.46% , respectively, NH4^＋ -N decreased and NO3^- -N increased during the process. The average removal efficiency of TN and NH4^＋ -N were 28.08% and 90. 44%, respectively, nitrate-nitrogen accumulated massively and nitrite- nitrogen （NO2^--N） accumulated a little. It was also observed that nitrification in earthworm ecofilter was strong and the denitrification was inhibited, TN removal was not as obvious as the NH4＋ -N removal due to the poor denitrification environment. The overall removal of TN can be improved by increasing wet/dry ratio, modifying the structure of filter, multistage filter series, following by constructed wetland, and increasing C/N ratio of the influent water.

关 键 词：蚯蚓生态滤池 农村生活污水 氮形态 去除效果 

分 类 号：X703.1[环境科学与工程—环境工程]