复合垂直流人工湿地氧化还原特征及不同功能区净化作用研究  

REDOX CHARACTER AND PURIFICATION OF DIFFERENT FUNCTION UNITS IN INTEGRATED VERTICAL-FLOW CONSTRUCTED WETLAND

作　　者：陶敏[1] 贺锋[1] 徐栋[1] 何起利[1] 梁威[1] 吴振斌[1] 

机构地区：[1]中国科学院水生生物研究所淡水生态和生物技术国家重点实验室

出　　处：《长江流域资源与环境》2008年第2期291-294,共4页Resources and Environment in the Yangtze Basin

基　　金：湖北省科技攻关重大项目(2006AA305A03);国家十五重大科技专项(2002AA601021);国家杰出青年基金项目(39925007);中国科学院知识创新工程重要方向项目(KSCX2-SW-102)

摘　　要：研究了复合垂直流人工湿地系统氧化还原电位(Eh)的时空变化规律及不同功能区中污染物的净化效果。结果表明:湿地系统下行流池表层、两池底层、上行流池表层Eh的变化范围分别为402~585、-87^-130、308~432mV,沿水流方向依次形成了好氧A区/缺氧、厌氧区/好氧B区3个功能区。好氧A区是污染物去除的主要区域,BOD5、CODCr、NH4+-N的去除率分别为43.0%、48.4%、54.1%,特别是NH4+-N去除率占总去除率的79%;缺氧、厌氧区主要是进行反硝化反应和有机物的厌氧分解;好氧B区则主要是去除厌氧分解后的有机物以及进一步脱氮。另外,NH4+-N的去除率与系统各功能区Eh呈显著相关关系(p<0.01),而BOD5、CODCr、NO3--N的去除率与系统各功能区Eh相关性不显著。Spatio-temporal variation of redox potential（Eh）in the integrated vertical-flow constructed wetland（IVCW）and purification efficiency of pollutants in different function units have been studied.The results showed that the Eh of down-flow surface strata,bottom strata and up-flow surface strata in IVCW were 402-585 mV,-87--130 mV and 308-432 mV,respectively.The IVCW system could be divided into three function units along the water flow direction—oxic A unit,anaerobic unit and oxic B unit.Oxic A unit is the predominant area for pollutants removing,of which the removal efficiency of BOD5、CODCr、NH4^＋-N were 43.0%,48.4%,54.1%,respectively,especially the NH4^＋-N,accounting for 79% of the total removal efficiency.Denitrification and anaerobic decomposition of organic matters primarily occurred in anaerobic unit.The further removal of organic matters after anaerobic decomposing and further nitrogen removal occurred in oxic B unit.It was also observed that there was significant correlation between the removal efficiency of NH4^＋-N and Eh of different function units in the system（p〈0.01）,but the correlation between the removal efficiency of BOD5、CODCr、NO3^--N and Eh of different function units were not significant.

关 键 词：复合垂直流人工湿地 氧化还原特征 功能区 净化作用 

分 类 号：X714.03[环境科学与工程—环境工程] X703