title: Growth characteristics of Arthrospira platensis cultured inside a new close-coil photobioreactor incorporating a mandrel to control culture temperature.
abstract: The aim of this study was to investigate Arthrospira growth inside a new CCP incorporating a mandrel for culture temperature control. Some hydrodynamic aspects and photobioreactor performances were investigated as well. The bioreactor incorporated A. platensis grown under batch and semicontinuous conditions. Two systems were used to recycle Arthrospira cultures: a peristaltic pump and an airlift system. When the pump recycled the culture, we achieved a very high Dean number (De=3,950), which decreased a great deal when the pump was replaced with the airlift system. During outdoor Arthrospira batch growth, a cell concentration of 16.4 g (DW)l-1 was reached after 9 days. However, the maximum chlorophyll content of the biomass (2.0% of DW) was achieved on the fifth and sixth days. The highest daily biomass output rate was obtained using the airlift system, when the CCP was operated under a semicontinuous regime: the gross output rate was 2.85+/-0.37 g (DW) l-1 d-1 and the net was 2.32+/-0.11 g (DW) l-1 d-1. The advantages of the airlift system may be due to the low concentration of oxygen built up inside Arthrospira culture and the lack of cell damage due to the pump system. Thus, oxygen and pump stress may have been avoided.
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto per lo Studio degli Ecosistemi, Sezione di Firenze, Polo Scientifico, Via Madonna del Piano, 50019 Sesto F.no, Firenze, Italy. p.carlozzi@ise.cnr.it
authors.forename: Pietro
authors.initials: P
authors.lastname: Carlozzi
authors.forename: Edoardo
authors.initials: E
authors.lastname: Pinzani
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000295:instrumentation* / Q000379:methods; D049109:Cell Proliferation; D000458:Cyanobacteria / Q000254:growth & development* / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D044085:Microfluidics / Q000295:instrumentation* / Q000379:methods; D018462:Photobiology / Q000295:instrumentation* / Q000379:methods; D011829:Radiation Dosage; D013696:Temperature