摘要
通过室内小型人工湿地装置,研究了人工湿地系统对氮、磷的去除效率及氮、磷元素在系统中的空间分布特征。在整个运行过程中,植物系统对NH+4-N、TN、TP的平均去除效率分别为55.02%、45.44%、98.52%,无植物系统为38.08%、33.63%、91.37%,植物系统对氮和磷的去除效率均高于无植物系统。在潜流型人工湿地系统中,植物生物量及氮、磷积累量沿水流方向逐渐降低,基质中磷浓度也表现出类似的规律,这种变化规律表明可以通过合理的植物配置来提高人工湿地对氮、磷的去除效率。分析人工湿地对氮、磷的去除途径表明:微生物的硝化/反硝化和基质对磷的吸附沉淀是人工湿地系统去除氮、磷的主要方式;植物吸收去除的氮、磷量分别占氮、磷投配总量的9.38%和12.77%,表明植物吸收也是人工湿地去除氮、磷的重要方式。
Two lab-scale constructed wetland systems using sands as their substrates,with and without plants （Lythrum salicaria Linn）,were used to investigate nitrogen and phosphorous removal efficiency and their distribution in the systems. The mean removal efficiency of NH4＋-N,TN,TP in the planted system were 55.02%,45.44%, 98.52% ,respectively, and 38.08%, 33.63% ,91.37% in the unplanted system,respectively; the removal efficiency of nitrogen and phosphorus in the planted system were higher than that in the unplanted system. Biomass and accumulation of nitrogen and phosphorus in plants decreased along the transect from the inlet to the outlet in the subsurface of the constructed wetland ,the concentration of TP in substrates showed the similar pattern as nitrogen and phosphorus distribution in plants; the results suggested that proper combination of different plant species was helpful for the enhancement of nitrogen and phosphorus removal efficiency. Analysis of nitrogen and phosphorus removal pathway showed that nitrogen was mainly removed through nitrification/denitrification process and phosphorous through adsorption and sedimentation by substrates; plant uptake amounted for 9.38% and 12.77%, respectively, of the amount of nitrogen and phosphorus loaded into the wetland, plant uptake was also an important pathway for nitrogen and phosphorus removal.
出处
《科技通报》
北大核心
2009年第6期848-853,859,共7页
Bulletin of Science and Technology
基金
国家自然科学基金(30471039)
关键词
人工湿地
氮
磷
去除效率
空间分布
constucted wetland
nitrogen
phosphorous
removal efficiency
spatial distribution
