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| Simultaneous removal of Microcystis aeruginosa and DOC by PFS coagulation combined with Ca3(PO4)2 crystallization |
| LIAO Min-fei, NIE Xiao-bao, WAN Jun-li, SUN Ju-long, OU Yang-shuai, LONG Yuan-nan, LIU Wan-qi |
| Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Engineering and Technical Center of Hunan Provincial Environmental Protection for river-lake dredging pollution control, School of Hydraulic & Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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Abstract Simultaneous removal of Microcystis aeruginosa (MA) and dissolved organic carbon (DOC) is desired for drinking water treatment plants (DWTPs) during cyanobacteria blooming. Ca3(PO4)2 crystallization pretreatment was utilized to enhance the coagulation efficiency of polymeric ferric sulfate (PFS), to realize well simultaneous removal performance for MA and DOC. The removal efficiency and mechanism of MA and DOC with Ca3(PO4)2 crystallization combined with PFS coagulation were studied. In addition, the adaptability to various cell densities and controlling of residual phosphorus were investigated. The results showed that at cell density of 2.0×106cells/mL and PFS dosage of 20mg/L, cells and DOC removal efficiencies of PFS were increased by Ca3(PO4)2 crystallization from 72.5% and 33.5% to 91.5% and 85%, respectively. The responsible mechanisms for cells removal were co-flocculation and aggravating effects of homogeneous crystalline products of Ca3(PO4)2; while the improvement of DOC removal rate was credited to the co-crystallization and Ca3(PO4)2 adsorption. The combination of Ca3(PO4)2 crystallization and PFS coagulation exhibited a good adaptability to the change of cell density, and the residual phosphorus concentration was anticipated to lower than 20μg/L. The results suggest that Ca3(PO4)2 crystallization combined with PFS coagulation should be a preferred alternative for DWTPs to removal cyanobacteria.
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Received: 10 November 2022
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