| 河渠岸坡特定生态系统的脱氮效率及影响因素 |
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| 引用本文： | 吴义锋,吕锡武,仲兆平,史静,徐微.河渠岸坡特定生态系统的脱氮效率及影响因素[J].中南大学学报(自然科学版),2011,42(2). |
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| 作者姓名： | 吴义锋 吕锡武 仲兆平 史静 徐微 |
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| 作者单位： | 东南大学能源与环境学院,江苏南京,210096 |
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| 基金项目： | 国家自然科学基金资助项目，浙江省水利厅科技计划项目 |
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| 摘 要： | 采用多孔混凝土为河渠生态护岸载体,联合微生物、绿色植物等生态因子构建模拟河渠岸坡特定生态系统,以研究该系统的脱氮效果及其去除机制.研究结果表明:岸坡特定生态系统能强化河渠中氮类污染物的去除效果,且脱氮过程符合一级反应动力学关系;具有完善特定岸坡生态系统的实验渠,停留时间为7 d时氨氮去除率达到85%～900/0:总氮(TN)的去除效果受季节影响,在植物生长季节(4～8月份),7 d的停留时间内TN去除率达到90%,脱氮反应动力学常数为0.33 1-0.353 d-1,主要是微生物反硝化和植物吸收脱氮,脱氮贡献率为85%左右;在冬季(12月份),当停留时间为7 d时,TN去除率仅为36.4%,反应动力学常数为0.064 d-1,微生物反硝脱氮的贡献率为80.9%,而植物吸收的脱氮贡献率仅为4.3%;硬质化岸坡的空白渠中,TN去除率低于72%,脱氮反应动力学常数K最大值仅为0.191 d-1;在河渠岸坡特定生态岸坡中,反硝化细菌群集数量的时空分布特性与坡面基质反硝化潜力的时空分布特性基本类似,具有明显的根际效应,水生植物带是系统脱氮的主要功能区.
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| 关 键 词： | 岸坡特定生态系统 多孔混凝土 脱氮 影响因素 |
Influencing factors of nitrogen removal from stream water using special riverine ecosystem |
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| WU Yi-feng,LU Xi-wu,ZHONG Zhao-ping,SHI Jing,XU Wei.Influencing factors of nitrogen removal from stream water using special riverine ecosystem[J].Journal of Central South University:Science and Technology,2011,42(2). |
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| Authors: | WU Yi-feng LU Xi-wu ZHONG Zhao-ping SHI Jing XU Wei |
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| Institution: | WU Yi-feng,LU Xi-wu,ZHONG Zhao-ping,SHI Jing,XU Wei (School of Energy & Environment,Southeast University,Nanjing 210096,China) |
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| Abstract: | An experimental model of streams with special riverine ecosystem was constructed to evaluate nitrogen removal from stream and its influencing factors using ecological embankments of porous concrete,microorganism and hydrophytes.The results show that the stream with the benefit of mature special riverine ecosystem gives the highest capacity of nitrogen removal,and the process of nitrogen removal fits first-order reaction kinetics,the reaction speed constant increases with the increase of temperature,and it i... |
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| Keywords: | special riverine ecosystem porous concrete nitrogen removal influencing factors |
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