Dominant bacteria in biofilms of biotricking filter for the bio- purification NO x in the coal-fired flue gas

Abstract:Bacterial population composition of biofilms in biotrickling filter was analyzed with one culture-independentmethod by denaturing gradient gel electrophoresis(PCR-DGGE)． It is found that Nitrobacter sp． ，Acinetobacter sp． ，Thermomonas sp． and Chloroflexus sp． are the dominant species of the biofilms． Nitrobacteria are the primary bacteriawhich oxidize NO x into NO －3 ． Autotrophic bacteria that act on the nitrification are symbiotic with heterotrophic mi-crobes． The heterotrophic bacteria besides can relieve organic production inhibition against autotrophic bacteria，but al-so make the denitrification by generating N 2 etc． and simultaneously produced alkaline production． The part mechanismof bio-purification NO x in the coal-fired flue gas in the view of bacterial community at molecular level is disclosed．Key words:bio-purification coal-fired flue gas;NO x ;biofilms;dominant bacteria;PCR-DGGE;nitrification and denitri-ficationNO x 的排放主要来源于煤炭的燃烧。它是目前工业环境中污染十分严重的气体，是形成酸雨的主要因素之一。微生物净化含NO