title: Growth characteristics of Chlorella sorokiniana in airlift and bubble column photobioreactors.
abstract: The present study investigated the feasibility of bioCO(2) sequestration using Chlorella sorokiniana. It was found that 5% CO(2) (v/v) in air was the most suitable concentration for the growth of this organism. At this concentration, the maximum rate of CO(2) sequestered and the biomass obtained were found to be 1.21 g L(-1)d(-1) and 4.4 g L(-1) respectively. Modeling and simulation of the growth profile was obtained using the logistic equation. Further, at higher CO(2) concentrations, pH drop in the growth media, TAP [-acetate], was prevented by replacing NH(4)Cl by NaNO(3.) Additionally, the study evaluated the performance of two reactors namely: bubble column and airlift reactor based on their growth profile and transport properties like K(L)a and mixing time. The growth profile was better in airlift reactor and it provides cyclic axial mixing of media. K(L)a of downcomer was significantly lower than the riser in airlift reactor.
authors.affiliation: Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
authors.forename: Kanhaiya
authors.initials: K
authors.lastname: Kumar
authors.forename: Debabrata
authors.initials: D
authors.lastname: Das
mesh_terms: D000388:Air; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis; D018929:Cell Culture Techniques / Q000295:instrumentation*; D002708:Chlorella / Q000166:cytology / Q000187:drug effects / Q000254:growth & development*; D003198:Computer Simulation; D003470:Culture Media / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007700:Kinetics; D016015:Logistic Models; D058433:Photobioreactors / Q000382:microbiology*; D013997:Time Factors
chemical_list: D003470:Culture Media; D002245:Carbon Dioxide