人工湿地处理低碳氮比污染河水时的脱氮机理.pdf

第26卷第11期环境科学学报Vol.26,No.11
2006年11月ActaScientiaeCircumstantiaeNov.,2006

赵联芳,朱伟,赵建.2006.人工湿地处理低碳氮比污染河水时的脱氮机理[J].环境科学学报,26(11):1821-1827
ZhaoLF,ZhuW,ZhaoJ.2006.Nitrogenremovalmechanisminconstructedwetlandusedfortreatingpollutedriverwaterwithlowerratioofcarbonto
nitrogen[J].ActaScientiaeCircumstantiae,26(11):1821-1827
人工湿地处理低碳氮比污染河水时的脱氮机理
赵联芳1,2,朱伟1,2,3,赵建2

1.河海大学环境科学与工程学院,南京210098
2.河海大学水文水资源与水利工程科学国家重点实验室,南京210098
收稿日期:2006202208修回日期:2006209225录用日期:2006209226

摘要:针对人工湿地处理城市污染河水时出现的脱氮效果不佳的问题,以受到严重面源污染的镇江古运河水为例,采用芦苇碎石床复合垂直流
人工湿地小试装置研究了人工湿地处理此类低碳氮比污水时的脱氮机理.试验结果表明,人工湿地对于污水中氮的去除主要发生在表层30cm
处,其去除机理主要包括填料、植物根系等对悬浮态氮的过滤、截留作用,微生物对溶解态氮的硝化反硝化作用以及植物的吸收作用;湿地下部
由于碳源缺乏抑制了反硝化过程,基本不能发挥除氮的作用;对于硝氮浓度高的污水,通过补充有机碳可以有效提高除氮效果,但对于氨氮浓
度高的污水,补充有机碳没有明显的效果.
关键词:人工湿地;河水;碳氮比;脱氮;机理

文章编号:025322468(2006)1121821207中图分类号:X522文献标识码:A

Nitrogenremovalmechanisminconstructedwetlandusedfortreatingpolluted
riverwaterwithlowerratioofcarbontonitrogen

ZHAOLianfang1,2,ZHUWei1,2,3,ZHAOJian2
1.CollegeofEnvironmentalScienceandEngineering,HohaiUniversity,Nanjing210098
2.StateKeyLaboratoryofHydrology2WaterResourcesandHydraulicEngineering,HohaiUniversity,Nanjing210098
Received8Feburary2006;receivedinrevisedform25September2006;accepted26September2006

Abstract:TakenthecontaminatedseriouslyZhenjiangOldCanalasanpollutedwaterexampleoflowerratioofcarbontonitrogen,thenitrogenremoval
mechanisminconstructedwetlandwiththeintegratedvertical2flowgravel2bedconstructedwetlandmicrocosmwasinvestigated.Basedontheexperiments,
threeconclusionsshowedthatnitrogenwasmostlyremovedinsurfacelayer(0～30cm)andtheremovalmechanismwascomposedofsuspended2nitrogen
filtrationofmediumandplantroots,whilethedissolvednitrogenwasremovedbynitrificationanddenitrificationofmicroorganismsandabsorptionof
hydrophytes.OwingtoLackofcarbonsourceunderlayer,denitrificationwasinhibitedandlittlenitrogenwasremoved.Supplyingorganiccarbonsource
wasaneffectivemethodtoimprovenitrogenremovalefficiencyfornitrate2nitrogenrichwastewater,whileitwasnotvalidobviouslytohighamm