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Reduction of biogas slurry and CO2 by Chlorella vulgaris in semi-continuous and continuous cultures

半连续及连续培养小球藻减排沼液及CO2



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ChineseJournalofBioprocessEngineering
Vol.10No.4
Jul.2012
doi:10.3969/j.issn.1672-3678.2012.04.004
OPQI
:2011-05-03
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:1672-3678(2012)04-0016-05
ReductionofbiogasslurryandCO2byChlorelavulgaris
insemicontinuousandcontinuouscultures
GAOHaofeng,LIHuan,WEIPing
(ColegeofBiotechnologyandPharmaceuticalEngineering,NanjingUniversityofTechnology,Nanjing210009,China)
Abstract:Chlorelavulgariswascultivatedbysemicontinuousandcontinuousmodetoreducetheemis
sionsofbothbiogassluryandCO2.Insemicontinuouscultivationmode,whentherenewalratewas
30%,nitrogenandphosphoruscontentsinthebiogasslurywerestableat16to18mg/Land04to06
mg/L,respectively,whichmetthesecondarysewagedischargeregulations.Whiletherenewalratein
creasedtohigherthan40%,adynamicequilibriumwasobtainedbetweenthemicroalgaebiomassandits
absorptionofnitrogenandphosphorusinthebiogassluryafterthreedays,buttheremovalratesofnitro
genandphosphorusdidnotmeetthedirectsewagedischargestandard.Efectsofchlorelavulgarisonthe
removalofnitrogenandphosphorusinthebiogasslurywereinvestigatedinacolumnarphotobioreactorby
selectingthedailyrenewalratesat20% and30% incontinuousmode.Theresultsexhibitedthatthetotal
nitrogenamountinthebiogassluryremainedat55.64mg/Lafter12daysonthe7Lscale.Emissionre
ductionofbiogassluryemployingthemicroalgaemethodwasprimarilyrestrictedbythelightlimitation
duringthelargescalecultivation.
Keywords:biogasslury;Chlosela.vulgaris;culturemode;nitrogen;phosphorus;removal
  
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