Promotion effect of Microcystis aeruginosa on defluorination by coagulation and its mechanism analysis
XIANG Yu1,2, XU Hui2, LI Kun1, WANG Xi2,3, WU Hao-Lan2,4, FAN Hua1
1. School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China; 2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China; 4. School of Water Resources and Environment Engineering, China University of Geosciences(Beijing), Beijing 100083, China
Abstract：Microcystis aeruginosa and aluminum chloride (AlCl3·6H2O) were chosen to research the effect of algae on the coagulation removal mechanism of fluoride through 3D-EEM, FE-SEM. The results showed that Microcystis aeruginosa had an obvious promotion effect on defluorination under the conditions of pH 7.0, 8.0, 9.0 and Al dosage of 20.0~80.0mg/L, which was mainly due to the surface adsorption of fluoride by algal flocs. Microcystis aeruginosa and the hydrolyzed products of coagulant aggregated into larger flocs by bridging and sweep flocculation. The larger the floc size was, the larger the fluoride removal rate was. When the pH value was 7.0 and the Al dosage was 40.0mg/L, the flocs reached the maximum particle size (500μm), and the fluoride removal rate was the largest (77.37%). When the Al dosage was 80mg/L, the algal cells were seriously damaged and the organic matter was released, which hindered the defluorination process. The results of floc breakage and adsorption experiments showed that certain strength breakage of algae floc could increase the adsorption site and thus improved the removal rate of fluoride. Excessive breakage led to too small particle size of algae flocs, resulting in the reduction of fluoride adsorption efficiency.
象豫, 徐慧, 李昆, 王希, 吴昊澜, 樊华. 铜绿微囊藻对混凝除氟的促进作用及机理分析[J]. 中国环境科学, 2021, 41(4): 1900-1908.
XIANG Yu, XU Hui, LI Kun, WANG Xi, WU Hao-Lan, FAN Hua. Promotion effect of Microcystis aeruginosa on defluorination by coagulation and its mechanism analysis. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1900-1908.
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