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| Study on preparation, flocculation effect, and mechanism of montmorillonite mineral material flocculant |
| Received:September 30, 2017 |
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| KeyWord:montmorillonite;flocculant;flocculation mechanism;settling performance;polyaluminum chloride |
| Author Name | Affiliation | E-mail | | WANG Chang | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China
Tianjin Marine Environmental Protection and Restoration Technology Engineering Center, Tianjin 300457, China | | | HU Wen-hong | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | | ZHANG Ying | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | | LI Li | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China
Tianjin Marine Environmental Protection and Restoration Technology Engineering Center, Tianjin 300457, China | | | ZENG Ming | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China
Tianjin Marine Environmental Protection and Restoration Technology Engineering Center, Tianjin 300457, China | ming.zeng@tust.edu.cn |
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| Abstract: |
| Montmorillonite flocculant(MTSF) was prepared with acid-modified inorganic mineral montmorillonite(MTS) and used to treat simulated wastewater, to which it was compared with the traditional flocculant polyaluminum chloride(PAC), in terms of settling effect and biotoxicity of the floc. The results showed that MTS(without acid modification) had no obvious flocculation performance, whereas MTSF(with acid modification) had good flocculation performance. Specifically, the maximum turbidity removal efficiency of MTSF reached 96.73% when compared to that of PAC. However, MTSF performed much better than PAC regarding settling volume and settling velocity of the floc. The MTSF flocculation mechanism was attributed to the joint function of adsorption and electrification, caused by a synergistic effect between solid particles and soluble salts of the MTSF, which gave rise to its better floc settling performance and compressive properties. After equilibrium of the flocculation settling process, the floc volume of MTSF was less than one third that of PAC. Overall, MTSF had similar flocculation effect to that of PAC in terms of turbidity removal efficiency, whereas its settling and compressive properties were much better than those of PAC. The novel flocculant MTSF was assumed to have superior comprehensive flocculation performance compared with traditional flocculants, such as PAC. |
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