含油污泥中石油降解菌的分离及其降解特性
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2020-03-09 10:50:03
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第9卷第7期环境工程学报Vol.9,No.72015年7月ChineseJournalofEnvironmentalEngineeringJul.2015含油污泥中石油降解菌的分离及其降解特性任丽君刘宪斌*田胜艳(天津科技大学,天津市海洋资源与化学重点实验室,天津300457)摘要从渤海油田含油污泥中分离出3株石油烃降解菌,通过16SrRNA基因序列鉴定RS1、RS2和RS3分别为棒状杆菌、短杆菌和假单胞菌。经单因素实验确定,3株细菌对石油的最适降解条件分别为37℃、盐度3%、pH8;32℃、盐度1%、pH8;42℃、盐度1%、pH6。降解实验结果表明,3株细菌30d内对含油污泥中总石油烃的降解率分别为39.69%、31.13%和53.29%,而混合菌的降解效果明显高于单一菌株,降解率为58.08%;不同菌株对原油中不同组分的降解能力不同,其中,RS1对饱和烃的降解率最高,达20.74%,RS3对芳香烃的降解率最高,达到8.08%;GC-MS分析表明,混合菌对n-C12~n-C34等正构烷烃均有明显降解,且对萘、苊、屈和苯并[b]荧蒽等多环芳烃的降解能力较强。关键词含油污泥微生物降解16SrRNA正构烷烃PAHs中图分类号X172文献标识码A文章编号1673-9108(2015)07-3538-07IsolationofpetroleumhydrocarbondegradingbacteriafromoilysludgeanditsdegradingcharacteristicsRenLijunLiuXianbinTianShengyan(TianjinUniversityofScience&Technology,TianjinKeyLaboratoryofMarineResourcesandChemistry,Tianjin300457,China)AbstractThreebacteriastrains,RS1,RS2andRS3,wereisolatedfrompetrochemicaloilysludgeofBohaiSeaOilfield(Tianjin,China)andidentifiedasCorynebacteriumsp.,Brevibacteriumsp.,andPseudomonassp.through16SrRNAsequencesimilaritysearch.Theoptimumdegradationconditionsofthreebacteriawerestudiedbysinglefactorexperiment,andtheresultswere37℃,salinity3%,pH8;32℃,salinity1%,pH8;42℃,salinity1%,pH6,respectively.ThedegradationresultsshowedthatthedegradationratesofTPHinoilysludgebyRS1,RS2andRS3were39.69%,31.13%and53.29%,andtheeffectofmixedbacterialcultures,withadegradationrateof58.08%,wassignificantlybetterthanthesinglebacteria.Thedegradingabilityofbacteriavarywithoilcomponent.RS1hadthebestdegradationeffectonaliphatichydrocarbon,itsdegradationratewas20.74%;andRS3hadthebestdegradationeffectonaromatichydrocarbon,anditsdegradationratewas8.08%.GC-MSanaly-sisshowedthatn-C12~n-C34n-alkanesweresignificantlydegradedbymixedbacteria,whichhavestrongdegra-dationcapacitywithPAHsincludingnaphthalene,acenaphthene,chryseneandbenzo[b]fluoranthene.Keywordsoilysludge;microbialdegradation;16SrRNA;n-alkanes;PAHs基金项目:天津市科技兴海项目(KJXH2012-23)收稿日期:2014-05-25;修订日期:2014-07-11作者简介:任丽君(1989—),女,硕士研究生,主要研究方向为生态环境修复。E-mail:nana.ren@163.com*通讯联系人,E-
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