第四章 微生物燃料电池 第三节 MFC的应用

第四章微生物燃料电池第一节微生物燃料电池概述第二节微生物燃料电池的材料与结构第三节微生物燃料电池的应用第四节微生物燃料电池的进展方向第三节微生物燃料电池的应用一、废水处理第三节微生物燃料电池的应用二、产氢†Werefertothisprocessaselectrohydrogenesis,as于electronsarereleasedbybacteriabuttheyarecombinedwithprotonstoformhydrogengasasaproduct,notelectricityasinanMFC.Thereactorusedforthisprocesshasbeengivendifferentnames,including:abioectrochemicallyassistedmicrobialreactor(BEAMR)(Ditzigetal.2007);andabiocatalyzedelectrolysiscell(BEC)asitisaprocessdependentonthebiocatalyzedelectrolysisoforganicmatter(Loganetal.2006).IfwefollowthesimpleomenclatureusedfortheMFC,itshouldbecalleda“microbialelectrolysiscell”(MEC)asanMFCproduceselectricitylikeafuelcell,andanMECproduceshydrogenlikeanelectrolysiscell.第三节微生物燃料电池的应用三、深海MFC†TheconceptoftheSMFCisquitesimple:Placetheanodeintotheanaerobicsedimentandplacethecathodeintotheoverlyingwatercontainingdissolvedoxygen.Thehighsalinityoftheseawaterprovidesgoodionconductivitybetweentheelectrodes,andtheorganicmatterneededbybacteriatoproduceelectricityisalreadyinthesediments.Theremarkablepartofthetestsatthattimewasthatexoelectrogenicbacteriawerealreadypresentinthesediments,andthattheywereabletosufficientlycompetewithmicroorganismsusingotherelectronacceptorstoproduceusefulamountsofpower.Theynotedthatsedimentsoncontinentalmarginstypicallycontained2-3%oforganiccarbon(dryweight)andthattheconstantfluxofnewcarbonintosedimentsifcapturedbysuchdevicescouldsustainpowergenerationatalevelof50mW/m2essentiallyindefinitely.FieldtestsofSMFCs.FieldtestsofSMFCs.†TestswithlargeSMFCswereconductedbyTenderetal.(2002)attwosites,oneinYaquinaBayEstuarynearNewport,Oregon,containing24%carbon(dryweight),andoneinasaltmarshareanearTuckerton,NJwithsedimentscontaining446%carbon.TheSMFCswereconstructedfromgraphitediscs48.3cmindiameterand1.3cmthick,perforatedwith790holesevenlyspacedatdistancesof0.64cm,producingatotalprojectedsurfaceareaof0.183m2(onesideonly).Theareaoftheelectrodebasedonbothsides,andusingareaexposedbytheholes,wasreportedbyotherstobe0.542m2(Ryckelyncketal.2005).Others