Zhang Le-hua, Jia Jin-ping, Ying Di-wen, Zhu Nan-wen, Zhu You-chun
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Res Microbiol. 2005 Jan-Feb;156(1):88-92. doi: 10.1016/j.resmic.2004.07.006.
A bio-anode reactor and a bio-cathode reactor were developed to investigate the microenvironments around anodes and cathodes and their effects on denitrification. With an applied current of 40 mA, the oxidation-reduction potentials (ORPs) in the bio-cathode and bio-anode reactors were 100-200 mV lower and 50 mV higher, respectively, than that in the control reactor (a normal bio-reactor). The cathode reaction enhanced denitrification and the anode reaction inhibited denitrification. At 40 mA, the denitrification rate in the bio-cathode reactor was 55.1% higher than that in the control reactor. At 75 mA, the denitrification rate in the bio-anode reactor was just 33.5% of that in control reactor. Electric current of less than 20 mA had no effect on the most probable number (MPN) of denitrifiers, but at 75 mA, the MPN of denitrifiers decreased by 90% in the bio-anode reactor. In the bio-cathode reactor, the MPN of denitrifiers increased more than 100% for the lower ORP environment produced by a cathode reaction at 75 mA.
开发了一个生物阳极反应器和一个生物阴极反应器，以研究阳极和阴极周围的微环境及其对反硝化作用的影响。在施加40 mA电流的情况下，生物阴极反应器和生物阳极反应器中的氧化还原电位（ORP）分别比对照反应器（普通生物反应器）低100 - 200 mV和高50 mV。阴极反应增强了反硝化作用，而阳极反应抑制了反硝化作用。在40 mA时，生物阴极反应器中的反硝化速率比对照反应器高55.1%。在75 mA时，生物阳极反应器中的反硝化速率仅为对照反应器的33.5%。小于20 mA的电流对反硝化菌的最可能数（MPN）没有影响，但在75 mA时，生物阳极反应器中反硝化菌的MPN下降了90%。在生物阴极反应器中，由于75 mA阴极反应产生的较低ORP环境，反硝化菌的MPN增加了100%以上。
