壳聚糖改性铝污泥絮凝除藻的参数优化及机理探究  

Parameters optimization and mechanism of chitosan modified alum sludge for removing algae

作　　者：赵晓红 武静 黄辂尉 袁春博 杨雨萌 高繁 任苇[2,3] ZHAO Xiaohong;WU Jing;HUANG Luwei;YUAN Chunbo;YANG Yumeng;GAO Fan;REN Wei(School of Civil Engineering,Chang’an University,Xi’an 710054,China;Power China Northwest Engineering Corporation Limited,Xi’an 710065,China;Shaanxi Union Research Center of University and Enterprise for River and Lake Ecosystems Protection and Restoration,Xi’an 710065,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710054 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [3]陕西省河湖生态保护与修复“四主体一联合”工程技术研究中心,陕西西安710065

出　　处：《应用化工》2024年第8期1838-1842,1852,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(42077183);陕西省四主体一联合河湖生态系统保护与修复校企联合研究中心基金项目(220228220662)。

摘　　要：利用壳聚糖将铝污泥表面电荷变为正电荷从而实现对藻类的絮凝去除。采用响应面法评价了藻液pH、壳聚糖与铝污泥配比、壳聚糖投加量及藻密度对改性铝污泥除藻性能的影响,并建立了相关数学模型。利用响应面软件的优化功能,得到藻液pH、铝污泥与壳聚糖配比、壳聚糖投加量、藻密度等参数的最优解分别为:7.51,53.28,4.51 mg/L和4.36×10^(6)cells/mL。最优条件下实测藻密度去除率100.0%,与模型预测结果一致。通过Zeta电位、SEM等表征,揭示改性铝污泥絮凝除藻的机理主要为藻细胞和改性铝污泥通过静电吸附形成絮体,反应过程快速、高效。Chitosan was used to change the surface charge of alum sludge into negative charge so as to realize the flocculation removal of algae.The effects of pH,ratio of chitosan and alum sludge,dosage of chitosan and algae density on algal removal performance of modified alum sludge were evaluated by response surface method,and a mathematical model was established.Using the optimization function of response surface software,the parameters of pH,the ratio of alum sludge to chitosan,chitosan dosage,algal density were 7.51,53.28,4.51 mg/L and 4.36×10^(6)cells/mL,respectively.The removal rate of algae density measured under the optimal conditions was 100.0%,which was consistent with the predicted results of the model.The flocculation mechanism was mainly that algae cells and modified alum sludge formed flocs through electrostatic adsorption,revealed by Zeta potential and SEM.

关 键 词：富营养化 藻 铝污泥 壳聚糖改性 絮凝 

分 类 号：TQ424[化学工程] X705[环境科学与工程—环境工程]