基于硝酸盐液膜微电极的动态膜反硝化特性研究  

Study on Denitrification Characteristics of Dynamic Membrane Based on Nitrate Liquid-Membrane Microelectrodes

作　　者：周小红[1] 施汉昌[1] 蔡强[1] 

机构地区：[1]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

出　　处：《环境科学》2006年第9期1781-1785,共5页Environmental Science

基　　金：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)

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反硝化区域,且动态膜内出现反硝化速率不同的2层,体现了有机物浓度、溶解氧的抑制作用及菌群竞争对反硝化速率的影响.Nitrate microelectrodes and ORP mlcroelectrodes were fabricated to study the denitrification characteristics of dynamic membrane at different COD loadings. The denitrification process was found at 0.6 - 1mm 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 - 128,4 mV which was appropriate to denitrification. When the COD loading was 0.45 kg/（m^3·d）, the denitrification rate （ NO3 -N） was the maximum of 0. 634 7 × 10^-6mol/（ L·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 denitrifieation rate.

关 键 词：动态膜 反硝化 微电极 硝酸盐 ORP 

分 类 号：X703.1[环境科学与工程—环境工程]