MFC强化同步短程硝化反硝化工艺的启动

微生物燃料电池(MFC)可在阴极实现反硝化、短程反硝化和同步硝化反硝化并产生电能,但在MFC阴极实现同步短程硝化反硝化的研究尚未见到报道。为了探讨MFC阴极同步短程硝化反硝化工艺的性能,将双室曝气阴极MFC与A/O脱氮工艺结合处理人工模拟低碳氮比废水。通过静置运行15 d使得MFC阴极室亚硝态氮得以积累,氨氧化菌得以富集。随即改为连续运行后第21天成功启动同步短程硝化反硝化MFC;阴极出水氨氮浓度为0.3 mg/L,亚硝态氮浓度为15.9 mg/L,硝态氮浓度为0.6 mg/L,亚硝化率达到95%以上,阴极电极自养反硝化去除率达到50%以上,COD去除率达到85%以上。结果表明,将MFC与同步短程硝化反硝化工艺结合,通过阴极室中氧气得电子获得高pH,可以强化同步短程硝化反硝化工艺,完成生物脱氮的同时回收电能,并具有减少外加碱度的优势。

Enhanced start-up of simultaneous short-cut nitrification and denitrification with microbial fuel cell

Microbial fuel cell (MFC) can achieve denitrification,short-cut denitrification and simultaneous nitrification and denitrification in the cathode,meanwhile,generate electricity.However,to date,simultaneous short-cut nitrification and denitrification process in the cathode of MFC has not been reported.In order to study the performances of simultaneous short-cut nitrification and denitrification process in the cathode of MFC,a dual-chamber aeration bio-cathode MFC was combined with the A/O biological nitrogen removal process to treat synthetic low C/N ratio wastewater.When nitrite accumulation and ammonia-oxidizing bacterial enrichment were achieved in the cathode of the MFC after a one-time feeding cultivation for 15 days,the reactor was converted to a continuous operation mode.21 days later,the simultaneous short-cut nitrification and denitrification was successfully accomplished in the cathode of the MFC.The concentrations of ammonia,nitrite and nitrate of the cathode effluent were 0.3mg/L,15.9 mg/L and 0.6 mg/L,respectively.The conversion rate of ammonia to nitrite was higher than 95%,and more than 50% nitrogen was removed by autotrophic denitrification.The removal efficiency of COD was higher than 85%.Combining the simultaneous short-cut nitrification and denitrification process with MFC,oxygen obtained the electrons in the aerobic cathode and a high pH value environment can be created,consequently,nitrogen removal and electric energy recovery can be achieved at the same time.The simultaneous short-cut nitrification and denitrification process can be strengthened and the need of the external alkalinity can be reduced.