Evaluation of carboxymethylpullulan-AlCl3 as a coagulant for water treatment: A case study with kaolin
Evaluation of carboxymethylpullulan-AlCl3 as a coagulant for water treatment: A case study with kaolin
复制标题
羧甲基支链淀粉-AlCl3 作为水处理混凝剂的评价：以高岭土为例
DOI：
10.1002/wer.1250
复制
发表时间：
2019-10-16
影响因子：
3.1
通讯作者：
Liu, Dongqi
中科院分区：
文献类型：
--
作者：
Chao, Hong-Jun;Zhang, Xinran;Liu, Dongqi
减少在饮用水处理中使用铝基絮凝剂被认为对人类健康至关重要。在本研究中，以羧甲基普鲁兰- alcl3为原料制备了一种新型的复合絮凝剂，在实验室规模的罐子试验系统中对高岭土的絮凝效果进行了评价。结果表明，羧甲基普鲁兰-AlCl3的混凝效果优于单独使用羧甲基普鲁兰或AlCl3。通过响应面法评价的最佳处理条件为pH 6.50、羧甲基普鲁兰13.03 mg/L、AlCl3 94.87 mg/L。Zeta电位测量和光度色散分析表明，AlCl3对电荷中和的影响比羧甲基普鲁兰更显著，而羧甲基普鲁兰促进了吸附和粒子桥的形成。因此，该复合絮凝剂既能增强絮凝效果，又能减少AlCl3的投加量，从而降低了对环境的二次污染。浊度为50浊度单位的模型高岭土悬浮液中加入90 mg/L羧甲基普卢兰- alcl3后，zeta电位和最大絮凝活性分别为-2.28 mV和98.0%。研究结果为水溶性多糖与无机絮凝剂制备环保型复合絮凝剂提供了参考。将CMP与AlCl3结合，制备了一种新型的水处理复合絮凝剂CMP-AlCl3。CMP-AlCl3的混凝效率比单独使用CMP或AlCl3更有效地降低浊度。通过Zeta电位分析、表面形貌、电子显微镜和混凝试验对絮凝效果和机理进行了研究。
A reduction in the use of aluminum (Al)-based flocculants in the treatment of drinking water is considered essential for human health reasons. In this study, a novel composite flocculant, made of carboxymethylpullulan-AlCl3, is evaluated in a lab-scale, jar test system for the flocculation of kaolin. The results showed that the coagulation efficiency of carboxymethylpullulan-AlCl3 was more effective in reducing turbidity than the solo use of carboxymethylpullulan or AlCl3. The optimum treatment conditions assessed by a response surface methodology were obtained at pH 6.50, 13.03 mg/L carboxymethylpullulan, and 94.87 mg/L AlCl3. Zeta potential measurements and photometric dispersion analysis demonstrated that AlCl3 had a more significant influence on charge neutralization than carboxymethylpullulan, whilst carboxymethylpullulan facilitated absorption and the development of particle bridges. Thus, the composite flocculant possessed both advantages that enhanced flocculation, and decreased the dosage of AlCl3, thereby reducing the potential for secondary environment pollution. When 90 mg/L carboxymethylpullulan-AlCl3 was added to the model kaolin suspension characterized by a turbidity of 50 nephelometric turbidity units, the zeta potential and the maximum flocculating activity were determined as -2.28 mV and 98.0%, respectively. The results provide insight into the development of an environment-friendly composite flocculant prepared from water-dissolved polysaccharide and inorganic flocculants. Practitioner pointsA novel composite flocculant CMP-AlCl3 was achieved by combining CMP and AlCl3 for water treatment. The coagulation efficiency of CMP-AlCl3 was more effective in reducing turbidity than the solo use of CMP or AlCl3. The flocculation efficiency and mechanism were investigated by Zeta potential analysis, surface morphology, electron microscopy, and coagulation.