| 基于硝酸盐液膜微电极的动态膜反硝化特性研究 |
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| 引用本文： | 周小红,施汉昌,蔡强.基于硝酸盐液膜微电极的动态膜反硝化特性研究[J].环境科学,2006,27(9):1781-1785. |
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| 作者姓名： | 周小红 施汉昌 蔡强 |
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| 作者单位： | 清华大学环境科学与工程系环境模拟与污染控制国家重点联合实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金项目(50478009);国家重点基础研究发展规划(973)项目(2005CB724901) |
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| 摘 要： | 制成性能良好的硝酸盐微电极与氧化还原电位(ORP)微电极,对动态膜在不同进水COD负荷下的内部反硝化过程进行研究.结果表明,动态膜中的反硝化作用出现在膜水界面0.6～1mm以下;在反硝化发生的区域,用ORP微电极测得氧化还原电位在88.6～-128.4mV之间,是反硝化发生的适宜ORP范围.当进水COD负荷为0.45 kg/(m3·d)时,动态膜的反硝化速率(以氮计)最大,可以达到0.634 7×10-6mol/(L·s).增加进水COD负荷能够拓展动态膜内部的
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| 关 键 词： | 动态膜 反硝化 微电极 硝酸盐 ORP |
| 文章编号： | 0250-3301（2006）09-1781-05 |
| 收稿时间： | 2005-07-22 |
| 修稿时间： | 2005-07-222005-10-06 |
Study on Denitrification Characteristics of Dynamic Membrane Based on Nitrate Liquid-Membrane Microelectrodes |
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| ZHOU Xiao-hong,SHI Han-chang and CAI Qiang.Study on Denitrification Characteristics of Dynamic Membrane Based on Nitrate Liquid-Membrane Microelectrodes[J].Chinese Journal of Environmental Science,2006,27(9):1781-1785. |
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| Authors: | ZHOU Xiao-hong SHI Han-chang and CAI Qiang |
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| Institution: | State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China,State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China,State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Nitrate microelectrodes and ORP microelectrodes were fabricated to study the denitrification characteristics of dynamic membrane at different COD loadings. The denitrification process was found at 0.6-1 mm depth beneath the interface of biofilm/bulk. The results of ORP microelectrode also demonstrated that the ORP value in the range of denitrification area was between 88.6 approximately -128.4 mV which was appropriate to denitrification. When the COD loading was 0.45 kg/(m3 x d), the denitrification rate (NO3- -N) was the maximum of 0.6347 x 10(-6 mol/(L x s). With the increase of COD loading, the denitrification area was increasing and two layers with different denitrification rates emerged in the dynamic membrane. The phenomenon implied the effect of organic concentration, oxygen concentration and bacterial competition on the denitrification rate. |
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| Keywords: | dynamic membrane denitrification microelectrode nitrate ORP |
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