title: Continuous Cr(VI) removal by Scenedesmus incrassatulus in an airlift photobioreactor.
abstract: Cr(VI) removal by Scenedesmus incrassatulus was characterized in a continuous culture system using a split-cylinder internal-loop airlift photobioreactor fed continuously with a synthetic effluent containing 1.0mg Cr(VI) l(-1) at dilution rate (D) of 0.3d (-1). At steady state, there was a small increase (6%) on the dry biomass (DB) concentration of Cr(VI)-treated cultures compared with the control culture. 1.0mg Cr(VI) l(-1) reduced the photosynthetic pigments content and altered the cellular morphology, the gain in dry weight was not affected. At steady state, Cr(VI) removal efficiency was 43.5+/-1.0% and Cr(VI) uptake was 1.7+/-0.1 mg Cr(VI) g(-1) DB. The system reached a specific metal removal rate of 458 microg Cr(VI) g(-1) DB d(-1), and a volumetric removal rate of 132 microg Cr(VI) l(-1) d(-1).
authors.affiliation: Department of Biotechnology and Bioengineering, Cinvestav, Ave. IPN 2508, Col. San Pedro Zacatenco, México 07360, DF, Mexico.
authors.forename: Carlos Rodrigo
authors.initials: CR
authors.lastname: Jácome-Pilco
authors.forename: Eliseo
authors.initials: E
authors.lastname: Cristiani-Urbina
authors.forename: Luis Bernardo
authors.initials: LB
authors.lastname: Flores-Cotera
authors.forename: Roberto
authors.initials: R
authors.lastname: Velasco-García
authors.forename: Teresa
authors.initials: T
authors.lastname: Ponce-Noyola
authors.forename: Rosa Olivia
authors.initials: RO
authors.lastname: Cañizares-Villanueva
mesh_terms: D001673:Biodegradation, Environmental / Q000528:radiation effects; D018533:Biomass; D019149:Bioreactors; D002857:Chromium / Q000302:isolation & purification*; D008027:Light; D010788:Photosynthesis / Q000528:radiation effects; D010860:Pigments, Biological / Q000378:metabolism; D044444:Scenedesmus / Q000378:metabolism* / Q000528:radiation effects*
chemical_list: D010860:Pigments, Biological; D002857:Chromium