functionalcompositionofbacterialcommunityindegradedredsoil［J］．JiangsuAgriculturalSciences，2021，49(16):60－66.Performanceandmicrobialevolutionofm-xyleneco-metabolicbiodegradationinabiotricklingfilterLIUJia，DOUXiao-na，QIHong-yi，LUShao-jie，LIPing，LIJian(KeyLaboratoryofBeijingonＲegionalAirPollutionControl，BeijingUniversityofTechnology，Beijing100124，China)Abstract:Toconstructaco-metabolicsystemandenhancethebiodegradationofm-xyleneinabiotricklingfilter，theinteractionbetweenm-xyleneandtolueneundervaryingmixingratioswasexplored．Theperformanceandmicrobialcommunitystructureandfunctionwereanalyzedinthisstudy．Theinletconcentrationoftoluenewasmaintainedatabout250mg/m3，andtheratiosoftolueneandm-xylenewere1∶1，1∶2，1∶4，and1∶6.Theresultsindicatedthatcomparedwiththeperformanceofsinglem-xyleneremoval，thebiodegradationwasimprovedwhentolueneandm-xyleneweremixedwiththeratiosof1∶1，1∶2，and1∶4，especiallywhentheradiowas1∶2，theremovalefficiency(ＲE)ofm-xylenewasincreasedfrom87.22%to96.61%，andbiodegradationwasinhibitedwhentheratiowas1:6.Thechangesinbiomassshowedthattoluenewasusedasagrowthsubstrate，providingcarbonandenergysourcesformicroorganisms，promotingthegrowthofmicroorganismsandtheformationofbiofilms，andthusstimulatingthegenerationofmicrobialco-metabolism．Intheprocessofco-metabolism，theabundanceofmicroorganismswasincreasedandthemicrobialdegradationabilitywasimproved．Inthewholebiodegradationprocess，bacteriaplayedanimportantroleandProteobacteriawerethemostdominantphylum，whichwascapableofefficientlyremovingm-xyleneandtoluene．Atthegenuslevelofbacteria，theabundanceofBurkholderiaandMycobacteriumincreasedduringco-metabolism，especiallyBurkholderiaincreasedfrom7.11%to21.94%．ThePICＲUSt(PhylogeneticInvestigationofCommunitiesbyＲeconstructionofUnobservedStates)showedthatamongtheprimarymetabolicpathways，thefunctionalgenesofMetabolismaccountedformorethan50%andincreasedrapidlyduringtheco-metabolismprocess，rankingsecondwithagrowthrateof19.86%．Amongthese...
