Synergistic mechanism of pH control by CO2 and CaO2 pre-oxidation to enhance algae dehydration

文献类型： 外文期刊

第一作者： Yang, Shumin

作者： Yang, Shumin;Ma, Shunjun;Zhang, Yongji;Xu, Bin;Yu, Shuili;Tang, Yulin;Wang, Xiaodong

作者机构：

关键词： Algae dehydration; Microcystis aeruginosa; Carbon dioxide; Moderate peroxidation; Dissolved organic matter

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 355 卷

页码：

收录情况： SCI

摘要： This study investigated the improvement of algal dehydration efficiency through CO2 pH adjustment and moderate pre-oxidation with CaO2 to enhance coagulation. Adjusting the pH of algal water to 6.0-9.5 with CO2 significantly affected zeta potential and photosynthesis, enhancing aluminum hydrolysis product aggregation. At pH 6.5, the composition of algal organic matter closely matched the original water, indicating minimal impact on algae and optimal cell activity. CaO2 pre-oxidation effectively reduced residual aluminum content and DOM release after coagulation. The DOM removal rate reached 44.50 % at pH 6.5, with the highest dehydration efficiency of 44.34 % and the lowest cell rupture rate of 5.55 %. Small molecular aromatic proteins decreased, while humic substances increased significantly. The chemical bonding between the EPS membrane and CaO2 improved system density and elasticity, enhancing dehydration performance. This study provides new insights and guidance for the ongoing study of pH and CaO2 enhanced algal dehydration.

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