厌氧阳极铵根离子透过质子交换膜的特性

Characteristics of Ammonium Ions Penetrating through Proton Exchange Membrane in Anaerobic Anode

建立双阴极微生物燃料电池产电装置,研究了装置物化作用下对厌氧阳极氨损失的影响。结果表明部分铵根离子能透过质子交换膜。此外,好氧池曝气使阴极附近的局部p H升高使得铵根离子变成易挥发的氨态氮,减小了好氧池、厌氧池的浓度差,削弱了铵根离子透过膜的作用,此时阳极氨氮减少了31%。另一方面,电流强度对铵根离子透过质子交换膜有促进作用。当好氧池、厌氧池、缺氧池全闭合运行2 h时,由于电流产生,阳极氨氮增加值为7.13 mg/L,增加了58%。研究结果对A2/O工艺耦合微生物燃料电池中氨损失的机理探究提供了理论基础。

Double cathode microbial fuel cell was set up, which can produce electricity. Physicochemical effect of electricity device on anaerobic ammonia loss was studied. The results show that part of ammonium ions can penetrate through proton exchange membrane. In addition, the aeration of aerobic tank makes the local pH higher near the cathode. It can reduce the concentration difference of the aerobic tank and the anaerobic tank because of volatilization of ammonia and weakens the effect of ammonium ions through the membrane, the anode ammonia nitrogen decreased by 31%. On the other hand current promote ammonium ions through the proton exchange membrane. When running time is 2 h, due to electricity generation in aerobic tank, anaerobic tank and anoxic tank which is full closed circuit, added concentration of ammonia nitrogen is 7. 13 mg/L, increases by 58%. The research provides data support for the mechanism of ammonia loss of A^2/O process coupling in the microbial fuel cell.