Effects of dissolved oxygen and influent COD/N ratios on nitrogen removal in horizontal subsurface flow constructed wetland
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.
Carbon extracting solution COD/N ratio Dissolved oxygen Horizontal sub-surface flow constructed wetland Nitrification-Denitrification Nitrogen removal
DING Yi SONG Xinshan WANG Yuhui YAN Denghua
College of Environmental Science & Engineering,Donghua University,N02999,Renmin North,Songjiang Dist China Institute of Water Resources and Hydropower Research,A-1 Fuxing Road,Beijing100038,China
国内会议
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
成都
英文
81-87
2013-10-01（万方平台首次上网日期，不代表论文的发表时间）