Effects of dissolved oxygen and influent COD/N ratios on nitrogen removal in horizontal subsurface flow constructed wetland
- 作者：DING YiSONG XinshanWANG YuhuiYAN Denghua
- 会议时间：2013-10-01
- 关键词：Carbon extracting solution ; COD/N ratio ; Dissolved oxygen ; Horizontal sub-surface flow constructed wetland ; Nitrification-Denitrification ; Nitrogen removal
- 作者单位：DING Yi,SONG Xinshan,WANG Yuhui(College of Environmental Science & Engineering,Donghua University,N02999,Renmin North,Songjiang District,Shanghai 201620,China)YAN Denghua(China Institute of Water Resources and Hydropower Research,A-1 Fuxing Road,Beijing100038,China)
- 母体文献：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛论文集
- 会议名称：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛
- 会议地点：成都
- 主办单位：中国环境科学学会
- 语种：chi
摘要
Horizontal subsurface flow constructed wetland (SSF CW) provides good conditions to denitrification but the ability of this system to nitrify NH4+-N is limited.The performance response of SSF CW to simulated wastewater with different COD/N (chemical oxygen demand: TN in influent) ratios was studied during an 8-month period in greenhouse conditions to improve the removal of NH4+-N.In this study,several wetland litters were hydrolyzed to get relevant carbon extracting solution,which was applied to the wetland systems.During the nitrification process,the variation of dissolved oxygen (DO) with COD/N ratios had a significant effect on the removal of NH4+-N.It was found that the total nitrogen (TN) removal efficiency increased with COD/N ratios.Appropriate control of the carbon or nitrogen source concentration and the COD/N ratio in the influent could achieve the optimal nitrogen removal.