芦苇潜流人工湿地氮转移规律的定量分析

Quantitative Analysis of Nitrogen Transferring Rule in Subsurface Flow Constructed Wetlands with Reeds

以大量试验资料为基础,对潜流型人工湿地的脱氮途径及规律进行了定量分析,并进行了脱氮机理的探讨。定量分析结果表明:潜流型人工湿地中,氨氮最大挥发量低于进水总氮的0.5%;湿地经过长期运行,基质吸附表现为惰性,仅为植物和微生物生长提供中介和场所;植物直接吸收量约占进水总氮的11%;微生物降解量约占进水总氮的50%,其中附着于基质表面的微生物降解量约为31%,附着于植物根系的微生物降解量约为19%。可见,微生物在潜流型人工湿地脱氮中起主导作用,植物的存在则进一步强化了微生物的作用。

Based on abundant experimental data, a quantitative analysis for nitrogen removal methods and rules in subsurface flow treatment wetlands（SSF） was presented. The mechanism of nitrogen removal was also discussed. Quantitative analysis results showed that the maximal ammonia volatilization was lower than 0.5% of the total nitrogen of influent in SSF. During the long-term process of SSF, the sediment adsorption behaved inefficiently. Sediments only acted as a medium for the growth of plants and microbe. About 11% of total nitrogen in influent was absorbed directly by plants, and about 50% was degraded by microbe. And in this 50%, about 31% was degraded by microbe adhered to sediments and about 19% was degraded by microbe adhered to plants roots. It was obvious that in constructed wetland.nitrogen removal system, microbe acted a dominant role while plants further enhanced this function.