Flocculation properties of bioflocculant MBF-7 produced by Penicillium purpurogenum in kaolin suspension
by Yongyou Hu, Xiaomin Yan, Wen Chen, Xiaowu Huang
International Journal of Environment and Pollution (IJEP), Vol. 37, No. 2/3, 2009

Abstract: The properties and modes of flocculation for kaolin suspension with bioflocculant MBF-7 produced by Penicillium purpurogenum, were investigated. The results showed that the optimum pH and dosage for flocculation was above 8 and more than 40 mg L⁻¹, respectively. Flocculating activity of MBF-7 was increased in the presence of Mg²⁺, Ca²⁺, Al³⁺, or Fe³⁺, especially in the presence of Ca²⁺, while monovalent Na⁺ and K⁺ had little enhancement. According to the zeta potential, FTIR and electrovalent bond tests, the mechanism of flocculation is suggested that coordination electrovalent bond is formed between Ca²⁺ and MBF-7, and then through coordination bridging between Ca²⁺ and kaolin, thus three-dimensional reticular flocs are formed via long chains of MBF-7.

Online publication date: Wed, 13-May-2009

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