厌氧流化床微生物燃料电池同步除碳脱氮产电性能影响因素

研究了厌氧流化床微生物燃料电池(AFB-MFC)除碳脱氮产电性能的影响因素。结果表明:(1)AFB-MFC对NH4+-N的去除不起作用。电压下降主要是由于进水有机基质浓度下降造成。(2)不添加NO3--N时,在满足AFB-MFC脱氮所需的电子供体条件下增加进水COD/TN有利于AFB-MFC产电。(3)3种无机氮共存下,AFB-MFC在进水有机碳与无机氮质量比(C/N)不低于1.37时,对COD、NO2--N和NO3--N具有理想的去除效果。AFB-MFB在一定进水C/N范围内(1.37～2.50),能得到稳定的输出电压及功率密度。(4)固定进水C/N时,AFB-MFC在高碳氮负荷下仍能得到较理想的NO2--N、NO3--N、COD去除效果,AFB-MFC对NH4+-N去除效果不明显;增加碳氮负荷,AFB-MFC输出电压及功率密度没有明显的改变。(5)有机基质浓度不变下,AFB-MFC中充足的电子供体可保证较高的NO3--N、COD去除率。AFB-MFC输出电压及功率密度随着时间延长而先增加至稳定值后下降。

Influencing factors of AFB-MFC for simultaneous carbon nitrogen removal and electricity generation

The influencing factor of anaerobic fluidized bed microbial fuel cell(AFB-MFC) system for simultaneous carbon nitrogen removal and electricity generation were investigated.The results indicated that NH+4-N can not be removed by AFB-MFC,the voltage drop of AFB-MFC system was caused by the decrease of organic substrate concentration.Feeding enough electron donor to AFB-MFC system without adding NO-3-N,the increase of COD/TN was benefited for electricity generation of AFB-MFC system;AFB-MFC presented perfect performance for COD,NO-2-N and NO-3-N removal when 3 inorganic nitrogen were coexistence in AFB-MFC and C/N less than 1.37;AFB-MFC could achieve stable output voltage and power density when influent C/N ranged 1.37-2.50.Fixing the inlet C/N of AFB-MFC system,the NO-2-N,NO-3-N,COD removal efficiency of the system was still desirable even under high carbon nitrogen load,while NH+4-N removal efficiency was not satisfactory.The output voltage and power density of AFB-MFC system had not obvious change when increasing the carbon nitrogen load.Fixing the inlet organic substrate,the plenty of electron donor in AFB-MFC system could ensure the high NO-3-N,COD removal efficiency.The output voltage and power density of AFB-MFC system was increased to a stable value and then decreased with extension the operation time.