Naturalsunlightinducedrapidformationofwaterbornalgalbacterialgranulesinanaerobicbacterialgranularphotosequencingbatchreactor

Naturalsunlightinducedrapidformationofwaterbornalgalbacterialgranulesinanaerobicbacterialgranularphotosequencingbatchreactor.pdf
Algal-bacterialgranularconsortiaareaggregatesofaerobicbacterialgranulesandthemicroalgae.Fastformationofalgal-bacterialgranuleswasstudiedsystematicallyinthepresentworkintermsofthegranulationprocess,mechanismsinvolvedandthecommunities.Anaerobicbacterialgranularsequencingbatchreactor(SBR)wasconfiguredundernaturallightexposure(12/12hoflight/darkregimes)andanextremelylowsettlingtimeof2minforspontaneousgranulation.Themorphologicalappearancesindicatedthatthereweretwomajorphasesforthegranulationperiods.Stepone(day1-3)witnessedabundantfilamentousbacteriabridgingwiththeinitialingwater-bornalgaeonthesurfaceofthegranules,andoverproductionofextracellularpolymericsubstances(especiallypolysaccharides(PS),tryptophan&protein-like,andhumicacid-likesubstances)wasobservedforbindingfunction.Steptwo(day4-7)experiencedthematurationofthespontaneousalgal-bacterialconsortia,whenthealgaegrewintotheinnersideofthegranules.Theyellowishaerobicbacterialgranulesturnedgreenonday3,andsoonbecamedarkgreenwhenthegranulesmaturedonday7.Thegrowthofthewater-bornalgaedecreasedthesettleability,meansizesofthegranules,butstimulatedthebioactivitythroughinteractionsbetweenalgaeandbacteria.Theovergrowthoffilamentousbacteriaandalgaesignificantlydecreasedthebiomassretentionintermsofbothmixedliquorsuspendedsludge(MLSS)andmixedliquorvolatilesuspendedsludge(MLVSS)duringthefirststage,whilestabilizedonstagetwo.SymbioticgrowthofalgaeoccurredduringgranulationprocessfortheincreaseofchlconcentrationsincludingChla,ChlbandtotalChl.Illuminaresultsrevealedthattheintroductionofalgaereducedtherichnessanddiversityofbacterialcommunity.Whereas,noobviousshiftsofthedominantgroupsatphylumandclasseslevelswerefound,thoughtheirrelativeabundanceschangedtodifferentdegrees.Incontrast,thenaturallyinitializedalgaeexperiencedthoroughdisplacefromDiatomeatogreenalgaeChlorophyceae.Thepresentworkshowedthespontaneousformationofalgal-bacterialcouldberapidlyachievedundernaturalsunlightirradiationbyseedingaerobicbacterialgranules.
作者：LiChenJiawenLiangShujiaZhangWenhaoXiaLiWangQiulaiHeHongyuWang
作者单位：SchoolofCivilEngineering,WuhanUniversity,Wuhan
母体文献：武汉大学第十一届湖北省给水排水工程与环境工程研究生学术论坛论文集
会议名称：武汉大学第十一届湖北省给水排水工程与环境工程研究生学术论坛  
会议时间：2017年12月9日
会议地点：武汉
主办单位：武汉大学
语种：chi
分类号：
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在线出版日期：2020年6月23日
基金项目：
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Naturalsunlightinducedrapidformationofwaterbornalgalbacterialgranulesinanaerobicbacterialgranularphotosequencingbatchreactor.pdf

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