Influence of growth phase on harvesting of Chlorella zofingiensis by dissolved air flotation

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• 作者：Xuezhi Zhang^a ; ^{xuezhi.zhang@asu.edu} ; Pasquale Amendola^a ; John C. Hewson^b ; Milton Sommerfeld^a ; Qiang Hu^a ; ^{huqiang@asu.edu}
• 关键词：Cell surface functional group ; Dissolved organic matter ; Algal harvesting ; Coagulation ; Model
• 刊名：Bioresource Technology
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：116
• 期：Complete
• 页码：477-484
• 全文大小：466 K

文摘

The effects of changes in cellular characteristics and dissolved organic matter (DOM) on dissolved air flotation (DAF) harvesting of Chlorella zofingiensis at the different growth phases were studied. Harvesting efficiency increased with Al³⁺ dosage and reached more than 90 % , regardless of growth phases. In the absence of DOM, the ratio of Al³⁺ dosage to surface functional group concentration determined the harvesting efficiency. DOM in the culture medium competed with algal cell surface functional groups for Al³⁺, and more Al³⁺ was required for cultures with DOM than for DOM-free cultures to achieve the same harvesting efficiency. As the culture aged, the increase of Al³⁺ dosage due to increased DOM was less than the decrease of Al³⁺ dosage associated with reduced cell surface functional groups, resulting in overall reduced demand for Al³⁺. The interdependency of Al³⁺ dosage and harvesting efficiency on concentrations of cell surface functional groups and DOM was successfully modeled.