摘要
微生物燃料电池(MFC)是一种既能去除污染物又能产电的新型污水处理技术,由于其具有利用生物转化能量的节能优势,MFC废水脱氮处理技术引起了更多的关注。本实验在启动MFC的同步硝化与反硝化(SND)后,首先研究了通路与断路条件对MFC产电脱氮的影响,结果表明:断路时有利于硝化反应的发生,氨氮去除率有最大值95.17%;而通路更有利于COD和总氮的去除,表明氮的去除主要依靠阴极接受电子进行。随后分析了曝气阶段+停曝阶段运行方式对MFC产电和脱氮的影响,结果显示:曝气8.5h(DO为4.0mg/L)后停止曝气,停曝阶段为11.5h,DO逐渐降低到2.0mg/L,输出电压由无曝气运行的31m V提高到120m V左右,氨氮去除率最高达到86.42%、总氮去除负荷由无曝气运行的0.064g/(L·d)升高到0.46g/(L·d)。说明曝气阶段+停曝阶段运行方式既能有效提高MFC脱氮产电性能又可以减少维持高浓度DO的能量输入。
Microbial fuel cell（MFC）is an innovative wastewater treatment technique for pollution remove and energy generation. Nitrogen removal using MFC is of great interest owing to the potential benefits of bioenergy production. In this study,simultaneous nitrification and denitrification in the cathode of MFC was investigated. The performance of MFC was influenced by operating methods. The experimental results demonstrated that maximum ammonia nitrogen removal rate was 95.17% under the condition of open circuit,which indicated that the open circuit is beneficial to nitrification while the closed circuit is more advantageous to COD and nitrogen removal,which showed that nitrogen removal depended mainly on accepting electron at cathode. The influence and mechanism of dissolved oxygen（DO） on the performance of nitrogen removal and electricity generation were investigated. The aeration-unaeration process was operated. The aeration lasted 8.5h at the beginning of the whole 20 h experiment. The DO was gradually reduced from 4.0mg/L（aeration） to 2.0mg/L（unaeration）. The results demonstrated that compared with the operation without aeration,the output voltage significantly increased from 31 m V to 120 m V and total nitrogen removal rate increased from 0.064g/（L·d） to 0.46g/（L·d）. The ammonia nitrogen removal rate was 86.42%. This suggested that the aeration-unaeration process was an effective way to remove nitrogen,produce electricity and reduce the energy input to maintain high DO concentration.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2016年第5期1549-1554,共6页
Chemical Industry and Engineering Progress
基金
陕西省科技发展计划项目(2014K15-03-02)
关键词
微生物燃料电池
同步硝化与反硝化
溶解氧
总氮去除
曝气
microbial fuel cell
simultaneous nitrification and denitrification
dissolved oxygen
total nitrogen removal
aeration
