连续流微生物燃料电池(MFC)反应器启动及生物颗粒的形成

Start-up of a Continuous Flow MFC and Bio-Particles Formation

为了回收废水中有机物蕴含的化学能并改善MFC对COD的去除效果,设计了一种新型厌氧流化床微生物燃料电池(AFB-MFC)用于同步高效废水处理及产电,对AFB-MFC反应器启动及生物颗粒形成进行了研究,并考察启动期内微生物燃料电池产电和废水处理性能以及外电阻对产电性能的影响。结果表明,在确定实验条件下,36d可快速成功启动AFB-MFC反应器并形成生物颗粒;启动期内,间歇运行时AFB-MFC产生的电压优于连续运行,间歇运行时最高电压850mV,而连续运行时下降至680～690mV,并最终稳定;COD去除率随进水负荷增加而增加,AFB-MFC反应器启动成功连续稳定运行后COD去除率可稳定在80.00%～90.41%;在外电阻为100Ω时,AFB-MFC产电性能最好,功率密度可达21.89mW·m-2。

To aim at the chemical energy recovery from organics contained in wastewater and the improvement of the COD removal efficiency of microbial fuel cell （MFC）,a new type MFC,i.e.anaerobic fluidized bed microbial fuel cell （AFB-MFC）,was designed and to be used for the wastewater treatment to produce electricity.The start-up of the AFB-MFC system and the formation of bio-particles in anode chamber of the MFC were studied.The electricity production performance and the wastewater treatment of the AFB-MFC system were examined during the start-up period.Moreover,the effect of external resistance on electricity production was studied too.The results show that,with certain experimental conditions,the AFB-MFC reactor can successfully start-up in 36 days and the mixed bio-particles are formed too.During the whole start-up period,the voltage generated by AFB-MFC in feed-batch mode is higher than that in continuous mode,and the highest voltage generated by AFB-MFC in feed-batch mode is 850 mV.When the AFB-MFC is operated in continuous mode,the voltage decreases to 680～690 mV,and finally becomes stable.The COD removal efficiency increases with the increase of influent volume loading rate,and when the AFB-MFC is successfully start-up and operated in continuous mode,the COD removal efficiency can be 80.00%～90.41%.When external resistance is 100Ω,the AFB-MFC has the best electricity production performance,and its power density can reach the highest value of 21.89 mW·m-2.