DOI: 10.1016/j.watres.2019.02.043
Scopus记录号: 2-s2.0-85062560957
论文题名: Flocculation-flotation harvesting mechanism of Dunaliella salina: From nanoscale interpretation to industrial optimization
作者: Besson A. ; Formosa-Dague C. ; Guiraud P.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155 起始页码: 352
结束页码: 361
语种: 英语
英文关键词: Atomic force microscopy
; Dunaliella salina
; Flocculation
; Flotation
; Harvesting
英文摘要: Dunaliella salina is a green microalgae species industrially exploited for its capacity to produce important amounts of carotenoid pigments. However in low nitrogen conditions in which they produce these pigments, their concentration is low, which results in harvesting difficulties and high costs. In this work, we propose a new solution to efficiently harvest D. salina at the pre-industrial scale, using flocculation/flotation harvesting induced by NaOH addition in the medium. We first show, using numerical simulations and nanoscale atomic force spectroscopy experiments, that sweeping mechanism in formed magnesium hydroxide precipitate is only responsible for D. salina flocculation in hypersaline culture medium upon NaOH addition. Based on this understanding of the flocculation mechanism, we then evaluate the influence of several parameters related to NaOH mixing and magnesium hydroxide precipitation and show that NaOH concentration, mixing, and salinity of the medium can be optimized to achieve high flocculation/flotation harvesting efficiencies in laboratory-scale experiments. We finally successfully scale-up the data obtained at lab-scale to a continuous pre-industrial flotation pilot, and achieve up to 80% of cell recovery. This interdisciplinary study thus provides original results, from the nano to the pre-industrial scale, which allow the successful development of an efficient large-scale D. salina harvesting process. We thus anticipate our results to be the starting point for further optimization and industrial use of this flocculation/flotation harvesting technique. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121885
Appears in Collections: 气候变化事实与影响
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作者单位: LISBP, Université de Toulouse, INSA, INRA, CNRS, Toulouse, France; LAAS, Université de Toulouse, CNRS, Toulouse, France; FERMAT, Université de Toulouse, CNRS, INPT, INSA, UPS, Toulouse, France
Recommended Citation:
Besson A.,Formosa-Dague C.,Guiraud P.. Flocculation-flotation harvesting mechanism of Dunaliella salina: From nanoscale interpretation to industrial optimization[J]. Water Research,2019-01-01,155