Iron-Based Technology Coupling Moderate Preoxidation with Hybrid Coagulation for Highly Effective Removal and Moderate Growth Inhibition of Oscillatoria in Drinking Water Treatment Plants
The notorious filamentous toxin-producing cyanobacteria Oscillatoria have exhibited increased frequency and distribution in source waters worldwide and have caused a series of issues in drinking water treatment plants (DWTPs). To solve these issues a novel technology coupling moderate preoxidation and hybrid coagulation through Fe(VI)–Fe(III) was invented. In this technology K2FeO4 can reduce the electronic repulsion between Oscillatoria filaments without cells’ lysis and thereby make them tend to aggregate into flocs. After preoxidation in-situ Fe(III) reduced from Fe(VI) will form a highly efficient hybrid coagulant through addition of a low dose of chitosan quaternary ammonium salt (HTCC). This process can remove most of the algal cells and metabolites in Oscillatoria-laden water and alleviate filter blockages. During sludge storage, the synergistic effect of the moderate oxidation of Fe(VI) and the anti-algal activity of HTCC can consistently control the proliferation of Oscillatoria and the increase of algal metabolites, thereby reducing the difficulty of sludge treatment and making the reuse of sludge water more feasible. Compared to conventional technologies in DWTPs, the treatment of Oscillatoria by the new technology is more efficient, safer and more stable, which may be a better alternative when Oscillatoria blooms break out in source water
Year of publication: |
[2022]
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Authors: | Jin, Yan ; Chen, Feiyong ; Xu, Bing ; Ma, Guangxiang ; Zhang, Lijie ; Yang, Zhigang ; Liu, Rupeng ; Sun, Cuizhen ; Cheng, Xiaoxiang ; Fu, Jie ; Xu, Chang ; Wang, Yue ; Wu, Daoji ; Wang, Lin |
Publisher: |
[S.l.] : SSRN |
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