Removal of High Phenol Concentrations with Adapted Activated Sludge in Suspended Form and Entrapped in Calcium Alginate /Cross-Linked Poly(N-vinyl pyrrolidone) Hydrogels

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• 作者：Margarita Herná ; ndez-Esparza ; M. Carmen Doria-Serrano ; Gabriela Acero-Salinas ; F. Alberto Ruiz-Trevi&ntilde ; o
• 刊名：Biotechnology Progress
• 出版年：2006
• 出版时间：December 2006
• 年：2006
• 卷：22
• 期：6
• 页码：1552 - 1559
• 全文大小：345K
• 年卷期：v.22,no.6(December 2006)
• ISSN：1520-6033

文摘

The present work evaluates the aerobic removal of 0.25-2 g/L of phenol by adapted activatedsludge in batch and continuous reactors, in suspended form and trapped in polymeric hydrogelbeads of calcium alginate(1%) and cross-linked poly(N-vinyl pyrrolidone), x-PVP (4%). Themechanical and chemical resistance of the entrapping hydrogel was also evaluated in threedifferent media: (I) rich in phosphate and ammonium ions; (II) using alternate P and N sources,and (III) without nutrients. The adapted consortium removed phenol concentrations up to 2 g/Lmore efficiently in the immobilized systems. A decrease in phenol removal rate was observedas the food/microorganisms (F/M) ratio increased. A zero-order kinetics was observed with phenolconcentrations > 1 g/L and a first-order kinetics at concentrations < 1 g/L. The best response(100% removal) was in the continuous reactors using type II medium, with a hydraulic residencetime (HRT) of 12.5 h, an influent pH = 5, and an F/M ratio below 0.25. The immobilizingmatrix deteriorated after 170 h of use in continuous reactors, especially with media I and II,probably due to the attrition forces, to chemical weakness of the material, and to the pressureof the bacterial growth inside the bead.