双室型无质子膜MFC协同去除COD和含氮污染物的能力

分别驯化、培养厌氧消化菌和反硝化菌，以间距180μm的不锈钢网为电极，构建了双室型无质子交换膜微生物燃料电池（MFCs）污水处理系统，厌氧消化菌在阳极附着成膜，组成生物阳极氧化去除有机污染物；反硝化菌在阴极附着成膜，组成生物阴极反硝化去除含氮污染物，实现污水深度处理。在电池系统稳定运行期间，最高开路电压为126．6mV，COD、NH4＋-N和NO3--N的最高去除率分别为88．9％、97．7％和98．2％，而出水中NO2--N的含量始终低于1．25mg／L。阳极室和阴极室不连通时，两室COD、NH4＋-N和NO3--N的最高去除率之和分别为67．0％、76．9％和84．0％，明显低于MFCs系统对污染物的去除能力，这表明该MFCs系统通过耦合阳极氧化和阴极还原作用，具有良好的有机污染物和含氮污染物协同去除能力。

Collaborative Removal Capacity of COD and Nitric Pollutant in Two-Chamber Membraneless Microbial Fuel Cells

A two-chamber membraneless microbial fuel cell （MFC） was constructed, in which denitrifying bacteria attached on the cathode performed as denitrification by using electrons and protons supplied by anaerobic bacteria on the anode oxidizing organic pollutant and stainless steel meshes （the pitch of holes was 180μm） was adopted as the electrode. During the stable operation of the MFCs, the highest open cell voltage was 126.6 mV, and the maximum removal rate of COD, NH4 ＋ --N, and NOa --N was 88.9%, 99.7%, and 98.2%, respectively. However, the content of NO2- - N in the effluent was always lower than 1.25mg/L. The total and maximal removal rate for COD, NH4＋-N and NO3 --N in separate anode chamber and cathode chamber was 67.0%, 76.9%, and 84.0%, respectively, which were lower than that in the MFC. It is indicated that the two-chamber membraneless MFC has the collaborative and efficient capacity for COD and nitric pollutant removal by coupling oxidation on the anode and disoxidation on the cathode.