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| Application of calcium ions for the control of Microcystis aeruginosa in drinking water treatment works |
| YI Jin1,2,3, NIE Xiao-Bao1,2,3, WANG Yi-Rui1,2,3, XIAO Hui-Yi-jiang1,2,3, LONG Yuan-nan1,2,3, JIANG Chang-bao1,2,3 |
1. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China;
3. Engineering and Technical Center of Hunan Provincial Environmental Protection for River-lake Dredging Pollution Control, Changsha 410114, China |
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Abstract In order to improve the flocculation removal effect of algae in drinking water treatment works, taking Microcystis aeruginosa as the research object, the algae removal effects of three methods:Ca2+ alone, Ca2+ combined with poly-aluminum chloride (PAC), and Ca2+ and CO32- in-situ crystallization were investigated. The algae removal mechanism of Ca2+ and the crystalline product CaCO3 are discussed. The results show that when Ca2+ was used alone, Ca2+ had an adsorption and electric neutralization effect on algae cells at low concentrations, and a bridging effect at high concentrations, but both can not achieve the removal of Microcystis aeruginosa. Ca2+ combined with PAC, Ca2+ could significantly improve the algae removal effect of PAC through adsorption and electric neutralization, and the maximum removal rate could reach 98.0%. At the same time, Ca2+ could aid in the decrease of residual aluminum of PAC coagulation by complexation with dissolved algae organic matter (dAOM), which could reduce the residual aluminum by more than 50%. The removal rate of Microcystis aeruginosa by in-situ CaCO3 crystals in algae-containing water could reach up to 83.5%, and the product was positively charged vaterite with a particle size of about 2 to 4μm. The removal mechanism of vaterite to algae cells includes mutual flocculation of vaterite and algae cells, as well as the sweeping flocculation of vaterite aggregates to algae cells. At the same time, vaterite could also be used as a weighting agent to promote the sedimentation and separation of algae crystal products. The use of in-situ crystallization of CaCO3 and PAC to remove algae in water plants was expected to reduce the dosage of PAC and the risk of residual aluminum, and solve the problem of turbidity and high pH caused by in-situ crystallization of CaCO3. The research result provides new ideas for algae removal in drinking water.
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Received: 29 March 2021
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