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1、ApplBiochemBiotechnol(2010)162:2324–2332DOI10.1007/s12010-010-9005-1Semi-continuousCultivationofChlorellavulgarisforTreatingUndigestedandDigestedDairyManuresLiangWang&YingkuanWang&PaulChen&RogerRuanReceived:13April2010/Accepted:2June2010/Publishedonline:22June2010#SpringerScience+BusinessMedia,LL
2、C2010AbstractThepresentstudy,basedonapreviousbatch-wiseexperiment,investigatedalab-scalesemi-continuouscultivationofgreenmicroalgaeChlorellavulgaris(UTEX2714),asausefulmeansfornutrientreductionaswellasproductionofalgalbiomasswhichcanbeusedaspotentialfeedstockfortheproductionofbiofuelandothercommo
3、dities,on20×diluteddairymanures.Bothundigestedanddigestedsampleswereappliedinparallelexperimentsforcomparisonregardingtherequirementsofhydraulicretentiontimes(HRTs),removalefficienciesofnitrogen,phosphorus,andchemicaloxygendemand(COD),biomassproductivities,andCO2sequestrationabilities.Itwasdemons
4、tratedthatalgaegrowninundigesteddairymanureachievedremovalratesof99.7%,89.5%,92.0%,+and75.5%forNH4–N,TN,TP,andCOD,respectively,undera5-dayHRT,whilethe+HRThadtoextendto20daysinordertoachieve100.0%removalofNH4–Nindigestedonewithsimultaneousremovalsof93.6%ofTN,89.2%ofTP,and55.4%ofCOD.Thehigherorgani
5、ccarboncontainedinundigesteddairymanurehelpedboostthegrowthofmixotrophicChlorella,thusresultinginamuchshorterHRTneededforcompleteremoval+ofNH4–N.Moreover,algaegrownindigesteddairymanureprovidedmorepenitentialthanthosegrowninundigestedoneinCO2sequestrationpermilligramofharvesteddriedbiomass(1.68mg
6、CO2/mgdryweight(DW)vs0.99mgCO2/mgDW),butdidnotsurpassintotaltheamountofCO2sequesteredona15-dayperiodbasisbecauseofthebetterproductivitygainedinundigesteddairymanure.KeywordsDairymanure.Nutrientsremoval.CO2sequestration.ChlorellaIntroductionEnergy-savingandenvironment-friendlymethodsfortreatingdai
7、rymanuresareinurgentdemandbecauseofthedeteriorationtofreshwatersbythelandapplicationofhighnutrientscontainingmanures.Inpreviousbatch-wiseexperiments[1,2],itwasdemonstratedthatL.Wang(*):Y.Wang:P.Chen:R.Ruan(*)Department
