摘要
构建了双阴极三室微生物燃料电池(MFCs),实现了同步脱氮和产电功能,并对其脱氮机理进行了分析。试验结果表明,在独立进水间歇运行阶段,厌氧阳极、好氧阴极和缺氧阴极的最大功率密度分别为1.0、0.34和0.31 W/m^3,厌氧阳极室和缺氧阴极室库伦效率分别为(21.4±8.8)%和(49.35±1.0)%,阳极室对COD和NH_4^+-N的去除率分别为(98.9±0.2)%和(46.5±4.0)%,好氧阴极硝化率接近100%,缺氧阴极的反硝化率为(45.2±3.8)%。在单一进水连续运行阶段,厌氧阳极、好氧阴极和缺氧阴极的功率密度分别为1.0、0.4和0.4 W/m^3,阳极室和缺氧阴极室库伦效率分别为(2.5±0.2)%和(18.3±0.4)%。当电路断开时,厌氧阳极室对COD和氨氮的去除率分别降低了9.1%和7.5%,好氧阴极室的硝化率和缺氧阴极的反硝化率分别降低了4%和8.8%,系统对COD、NH_4^+-N和TN的总去除率分别降低了2.3%、5.8%和15.6%,说明在MF-Cs产电过程中,能够促进阳极对有机物的氧化和阴极的硝化、反硝化过程。阳极和缺氧阴极库伦效率较低,说明存在非产电过程的有机物氧化途径和硝酸盐还原途径。
Dual-cathode three-chamber microbial fuel cells （MFCs） were constructed to realize simultaneous nitrogen removal and electricity generation, and the mechanism of nitrogen removal was ana- lyzed. During separate-batch feeding phase, the maximum power densities of anaerobic anode, aerobic cathode and anoxic cathode chambers were 1.0 W/m3, 0. 34 W/m3 and 0.31 W/m3 respectively, and the eoulombic efficiencies for anaerobic anode and anoxic cathode chambers were （21.4 ± 8.8 ） % and （49.35± 1.0）% respectively. COD and NH4＋ -N removal efficiencies of the anaerobic anode chamber were （98.9 ± 0.2 ） % and （46.5± 4.0） % respectively, nitrification rate of aerobic cathode chamber and denitrification rate of anoxic cathode reached about 100% and （45.2±3.8 ）% respectively. Duringsingle-continuous feeding phase, power densities of anaerobic anode, aerobic cathode and anoxie cathode chambers were 1.0 W/m3 , 0.4 W/m3 and 0.4 W/m3 respectively, and the coulombie efficieneies of an aerobic anode and anoxic cathode chambers were （2.5± 0.2） % and （ 18.3 ± 0.4） % respectively. When the circuit was disconnect, the COD and NH4＋ - N removal efficieneies of the anaerobic anode chamber were reduced by 9.1% and 7.5% respectively, the nitrification rate of aerobic cathode chamber and the denitrification rate of anoxic cathode were reduced by 4% and 8.8% respectively, and the total removal efficiencies of COD, NH4＊ - N and TN were reduced by 2.3% , 5.8% and 15.6% respectively, which showed that organic oxidation by the anode and nitrification/denitrification process of the cathode could be promoted by electricity production of the MFCs. However, low coulombic effieiecies of anaero- bic anode and anoxic cathode chambers were obtained, indicating the existence of organic oxidation dur- ing non-electrochemical process and nitrate reduction.
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第5期71-76,共6页
China Water & Wastewater
基金
国家自然科学基金资助项目(51778057)
陕西省教育厅专项科研计划项目(2013JK0887)
关键词
微生物燃料电池
生物阴极
生物电化学反硝化
脱氮
产电
microbial fuel cells
biocathode
bioelectrochemical denitrification
nitrogen re-moval
electricity generation
