| 循环流廊道湿地中氮归趋过程模拟研究 |
| 摘要点击 3650 全文点击 1762 投稿时间：2013-08-13 修订日期：2013-09-29 |
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| 中文关键词 循环流廊道湿地 氮 迁移转化模型 沸石吸附 去除贡献 |
| 英文关键词 circular-flow corridor wetland nitrogen transformation and conversion model zeolite adsorption removal contribution |
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| 中文摘要 |
| 针对新型高效脱氮循环流廊道（CFC）湿地，构建了涵盖6种氮形态、3类介质、10种代谢途径的N循环模型，探索了湿地内N迁移转化模式.结果表明，沸石吸附（53.3%）、植物吸收NH4+-N（27.6%）、NO3--N反硝化（10.2%）、植物吸收NO3--N（2.9%）和NO2--N短程反硝化（1.5%）对TN去除贡献依次降低.NH4+-N去除机制存在季节差异，其中1月NH4+-N主要通过沸石吸附去除（84.5%）；4~6月通过植物吸收去除（76.4%~85.3%）；7月通过沸石吸附（36.1%）、亚硝化（45.8%）及植物吸收（21.4%）共同去除.此外，定期收获植物、按期再生沸石及种植水生植物可分别提升TN去除率1.7%~7.7%、43.1%~72.2%和19.8%~36.2%.综之，CFC湿地去除途径多样性保障了TN的长期高效去除. |
| 英文摘要 |
| Nitrogen transformation and removal in a novel circular-flow corridor (CFC) wetland was simulated. A computer model covering 6 nitrogen forms, 3 media and 10 transferring pathways, was developed. The results show that the TN removal is attributed to zeolite adsorption (53.3%), plants NH4+-N uptake (27.6%), denitrification (10.2%), plants NO3--N uptake (2.9%) and short-cut denitrification (1.5%). The major removal pathway for NH4+-N varies from season to season. In January, the zeolite adsorption played the most important role in NH4+-N removal with a contribution of 84.5%. From April to June, the plants uptake accounted for 76.4%-85.3% NH4+-N removal. While in July, there were three removal pathways, namely zeolite absorption (36.1%), nirtosation (45.8%) and plants uptake (21.4%), playing an important role in nitrogen removals. Additionally, regular plants harvesting, periodical zeolite regenerating and aquatic plants growing can improve the TN removal rate by 1.7%-7.7%, 43.1%-72.2% and 19.8%-36.2%, respectively. In short, it is by the diverse removal pathways in CFC wetland that nitrogen can be continuously removed. |
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