摘要
对潜流构造湿地处理农业面源污水的脱氮效果进行了中试研究 .研究证明潜流湿地氮去除效率和水力停留时间呈正相关关系 ,芦苇床的脱氮效果明显好于茭草床和空白床 ,名义水力停留时间大于 5d时 ,芦苇、茭草潜流湿地脱氮效率可以达到 60 %以上 .氮的去除满足一级推流反应动力学关系 ,空白床、芦苇床和茭草床的一级反应动力学常数K分别为 0 1 4、0 2 6和 0 2 0d- 1.微生物的反硝化是人工湿地脱氮的主要途径 ,植物吸收总氮量仅占入水量的 1 5
Nitrogen removal in subsurface constructed wetland treating agriculture non-pointed wastewater was studied in pilot-scale. The experimental results showed that the removal rates of TN increases with HRT increasing. The removal rates of TN achieved 60% in macrophyte bed system when the nominal hydraulic retention time was 5 days. Removal of TN followed first-order plug flow kinetics. Rate constant of Non-plant bed、 Phragmitas communis bed and Zizania caduciflora bed was 0.14、0.26 and 0.20 d -1 respectively. Denitrification was the main removal mechanism of total nitrogen, the amount of TN that can be removed by harvesting were above 15% compared to the loading into constructed wetland system.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第1期113-116,共4页
Environmental Science
基金
国家"十五"科技攻关项目 (K99 0 5 3 5 0 2 )