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《Environmental Science》 2003-05
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Kinetics and Mechanism of Removing Microcystis aeruginosa Using Clay Flocculation

Pan Gang, Zhang Mingming, Yan Hai, Zou Hua, Chen Hao(State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China  
Twenty-six natural clays were studied for their kinetics of flocculating and removing algal cells of Microcystis aeruginosa. According to the 8 h equilibrium removal efficiencies and removal rates at a clay-loading of 0.7 g·L -1, all the 26 clays were classified into three categories. Type-I clay, which includes talc, ferric oxide, sepiolite, ferroferric oxide, and kaolinite, has an equilibrium removal efficiency greater than 90%, a t 50 (time needed to remove 50% of the algae) of less than 30 min, and a t 80 (time needed to remove 80% of the algae) of less than 2.5 h. Type-Ⅱ clay, which includes argillanceous rocks, attapulgite, rectorite, illite, and argil, etc., has an equilibrium removal efficiency of 50%~80%, a t 50 of less than 2.5 h, and a t 80 of more than 5 h. Type-Ⅲ clay consists of 14 minerals, including laterite, zeolite, mica, clinoptilolite, pumice, tripoli, feldspar and quartz, etc. with the removal efficiency less than 50%, and t 50 8h. When the clay loading was decreased to 0.1~0.2 g·L -1, the 8 h equilibrium removal efficiencies for 25 clays declined to below 60%, except for sepiolite, a Type-I clay, which maintained around 90%. After the sepiolite was modified with Fe 3+ to increase its surface charge (Zeta potential from -24.0 mV to +0.43 mV at pH 7.4), the initial removal rate was increased remarkably although its 8 h equilibrium removal efficiency was not improved substantially. As a comparison, the 8 h equilibrium removal efficiency of PAC was no greater than 40% at loadings of 0.02~0.2 g·L -1. Following the analysis of the flocculation mechanism it was concluded that the effect of bridging and netting may play a key role in the clay-algae flocculation processes, which may be important for selecting and modifying clays to improve significantly the removal efficiency.
【Fund】: 国家自然科学基金资助项目 (2 0 1770 2 9) ;; 国家“十五”重大科技专项 (2 0 0 2AA6 0 10 1) ;; 中国科学院“百人计划”项目
【CateGory Index】: X52
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