biodegradation mechanism and technology of polycyclic aromatic hydrocarbons

《biodegradation mechanism and technology of polycyclic aromatic hydrocarbons》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、BiodegradationMechanismandTechnologyofPolycyclicAromaticHydrocarbons　　【Abstract】Polycyclicaromatichydrocarbonsareaclassofpotentiallyhazardouschemicalsofenvironmentalandhealthconcern.PAHsareoneofthemostprevalentgroupsofcontaminantsfoundinsoil.Biodegradationofcomplexhydrocarb

2、onusuallyrequiresthecooperationofmorethansinglespecie.ThispaperreviewstheexistingscreeningmethodsofPAH-degradingbacteria.Itstudiedthemechanismandtechnicalapplicationsoftheco-metabolisminPAHs.AuthorgivesthesuggestionsandprospectsinBiodegradabletrendofPHAs.　　【Keywords】PHAs；Bi

3、odegradable；Co-metabolism　　1Introduction　　Polycyclicaromatichydrocarbons（PAHs）areagroupofpersistentorganiccompoundscomposedoftwoormorefusedaromaticringswithlowwatersolubility.PAHscomprisealargeandheterogeneousgroupoforganiccontaminantswhichareformedandemittedasaresultofthei

4、ncompletecombustionoforganicmaterial（Muller，H.，Breure，A.M.，Rulkens，W.H.，2004）.Anthropogeniccontaminationsources，suchasroadtrafficandcombustionoffossil9fuelspredominate，buttherearealsonaturalsources，e.g.volcaniceruptionsandforestfires（Lee，P.K.，Ong，S.K.，Golchin，J.，Nelson，G.L.

5、，2001；hodadoust，A.P.，Bagchi，R.，Suidan，M.T.BrennerR.C.，Sellers，N.G.，2000）.　　Duetotheirtoxic，mutagenicandcarcinogenicproperties（Menzie，1992），16PAHshavebeenlistedasprioritypollutantsbyUSEnvironmentalProtectionAgency（EPA）.The16regulatedPAHcomprisebothlowandhighmolecularweightsp

6、ecies，andsevenofthemaredesignatedasknownhumancarcinogens.AllofthecarcinogenicPAH（cPAH）arehighmolecularweightcompounds（Amellal，N.，Portal，J.M.，BerthelinJ.，2001；.Michael，D.，Aitken，Shu-HwaChen，ChikomaKazunga，Randall，B.，Marx，2004）　　DuetothestablenatureofPAHs，itisveryslowtobedegr

7、adedbynaturalconditions.Recently，bioremediation，whichisaneconomicandefficientalternativemethodtootherremediationprocessessuchaschemicalorphysicalones，hasbeendevelopedasaenvironmentclean-uptechnique（O.Potin，E.Veignie，C.Rafin，2004；B.Antizar-Ladislao，J.Lopez-Real，A.J.Beck，2004

8、）.Ithasmanyadvantagesineconomic，safeandresidue.　　Ithasthreeaspectsmainresearchinap