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钙离子对混凝去除水体中铜绿微囊藻的影响

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吴昊澜, 杨晓芳, 沈敏丽, 刘菲, 王东升. 钙离子对混凝去除水体中铜绿微囊藻的影响[J]. 环境工程学报, 2018, 12(3): 839-847. doi: 10.12030/j.cjee.201708138
引用本文: 吴昊澜, 杨晓芳, 沈敏丽, 刘菲, 王东升. 钙离子对混凝去除水体中铜绿微囊藻的影响[J]. 环境工程学报, 2018, 12(3): 839-847. doi: 10.12030/j.cjee.201708138
shu
WU Haolan, YANG Xiaofang, SHEN Minli, LIU Fei, WANG Dongsheng. Impact of calcium ion on removal of Microcystis aeruginosa in water by coagulation[J]. Chinese Journal of Environmental Engineering, 2018, 12(3): 839-847. doi: 10.12030/j.cjee.201708138
Citation: WU Haolan, YANG Xiaofang, SHEN Minli, LIU Fei, WANG Dongsheng. Impact of calcium ion on removal of Microcystis aeruginosa in water by coagulation[J]. Chinese Journal of Environmental Engineering, 2018, 12(3): 839-847. doi: 10.12030/j.cjee.201708138
shu

钙离子对混凝去除水体中铜绿微囊藻的影响

  • 1.

    中国地质大学北京水资源与环境学院，北京 100083

  • 2.

    中国科学院生态环境研究中心环境水质学国家重点实验室，北京 100085

  • 基金项目:

    国家水体污染控制与治理科技重大专项 (2015ZX07406005-002)

Impact of calcium ion on removal of Microcystis aeruginosa in water by coagulation

  • 1.

    School of Water Resources and Environment, China University of GeosciencesBeijing, Beijing 100083, China

  • 2.

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

  • Fund Project:

  • 摘要: 以铜绿微囊藻为对象，研究了钙离子对聚合氯化铝（polyaluminumchloride，PAC）混凝沉淀藻细胞的影响及其可能的机理。结果表明，添加钙离子对PAC混凝去除模拟水样藻细胞和浊度均具有促进作用。在PAC摩尔浓度较低时（0.02 mmol·L-1），最高可将除藻率和除浊率分别提高66.4%和76.8%。三维荧光及总溶解性有机碳（total dissolved organic carbon，TDOC）分析表明钙离子对去除水中溶解性胞外有机物（dissolved extracellular organic matter，dEOM）没有显著作用。利用Zeta电位和絮体形态对其影响混凝除藻效果的可能机理进行探究，发现钙离子能通过压缩双电层和吸附电中和提高藻细胞表面的Zeta电位，从而促进胶体脱稳凝聚。推测钙离子通过与铜绿微囊藻表面的黏附型胞外有机物（bound extracellular organic matter，bEOM）发生阳离子架桥作用促进藻细胞脱稳混凝沉淀。钙离子能够促进铜绿微囊藻脱稳，但是絮体粒径、强度、恢复能力的主要影响因素还是PAC摩尔浓度。
    Abstract: The effects of calcium ions on polyaluminium chloride (PAC) coagulated Microcystis aeruginosa cells and its possible mechanism were studied. The results indicated that calcium ions could improve PAC coagulation efficiency by increasing simulated water algae cells removal and turbidity removal. Even if the PAC congratulation is relative low (0.02 mmol·L-1), the algae cells removal rateand turbidity removal rate were improved by 66.4% and 76.8%, respectively. Three-dimensional fluorescence analysis and TOC results showed that calcium ions had no significant effect on the removal of dissolved extracellular organic matter (dEOM) in water. The possible mechanism of coagulation and algae removal by Zeta potential and floc morphology was studied. It was found that Ca2+couldpromotethecolloid destabilization by increasing the Zeta potential of algal cells through compressing the electric double layer and adsorption charge neutralization. It is speculated that calcium ions promote the algae cell destabilization by cationic bridging with the bound extracellular organic matter (bEOM) on the surface of Microcystis aeruginosa. Although calcium ions can promote the destabilization of Microcystis aeruginosa, the main influence factor of floc diameter, strength factor, recovery factor is PAC dosage.
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  • 刊出日期:  2018-03-22

钙离子对混凝去除水体中铜绿微囊藻的影响

  • 1. 中国地质大学北京水资源与环境学院，北京 100083
  • 2. 中国科学院生态环境研究中心环境水质学国家重点实验室，北京 100085
基金项目:

国家水体污染控制与治理科技重大专项 (2015ZX07406005-002)

摘要: 以铜绿微囊藻为对象，研究了钙离子对聚合氯化铝（polyaluminumchloride，PAC）混凝沉淀藻细胞的影响及其可能的机理。结果表明，添加钙离子对PAC混凝去除模拟水样藻细胞和浊度均具有促进作用。在PAC摩尔浓度较低时（0.02 mmol·L-1），最高可将除藻率和除浊率分别提高66.4%和76.8%。三维荧光及总溶解性有机碳（total dissolved organic carbon，TDOC）分析表明钙离子对去除水中溶解性胞外有机物（dissolved extracellular organic matter，dEOM）没有显著作用。利用Zeta电位和絮体形态对其影响混凝除藻效果的可能机理进行探究，发现钙离子能通过压缩双电层和吸附电中和提高藻细胞表面的Zeta电位，从而促进胶体脱稳凝聚。推测钙离子通过与铜绿微囊藻表面的黏附型胞外有机物（bound extracellular organic matter，bEOM）发生阳离子架桥作用促进藻细胞脱稳混凝沉淀。钙离子能够促进铜绿微囊藻脱稳，但是絮体粒径、强度、恢复能力的主要影响因素还是PAC摩尔浓度。

English Abstract

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