Interaction mechanisms of humic acid combined with calcium ions on membrane fouling at different conditions in an ultrafiltration system

被引：92
|
作者：
Lin, Tao [1 ,2 ]
Lu, ZiJian [2 ]
Chen, Wei [1 ,2 ]
机构：
[1] Hohai Univ, Key Lab Integrated Regulat & Resource Dev Shallow, Minist Educ, Nanjing 210098, Jiangsu, Peoples R China
[2] Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China
来源：
DESALINATION | 2015年 / 357卷
基金：
中国国家自然科学基金;
关键词：
Membrane fouling; XDLVO; Humic acid; Calcium ion; Ultrafiltration; FOULED REVERSE-OSMOSIS; NANOFILTRATION MEMBRANES; PHYSICAL ASPECTS; UF MEMBRANES; ADSORPTION; NOM; FILTRATION; OZONATION; PRESSURE;
D O I：
10.1016/j.desal.2014.11.007
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) approach was used to predict the mechanisms regarding the influence of humic acid together with calcium ions on membrane fouling in an ultrafiltration (UP) system. The polymeric UF membranes composed of polyvinylchloride (PVC) were selected to investigate membrane fouling. The results indicated that membrane fouling was aggravated when the total interaction energy caused by humic acid combined with calcium ions decreased. Calcium ions aggravated membrane fouling, compared with water samples without calcium ions. Increasing concentrations of calcium ions resulted in greater membrane fouling due to their chelation with humic acid. Increased pH influenced the interaction between calcium ions and humic add, resulting in an increase in the total interaction energy, which reduced membrane fouling. Prechlorination reduced the interaction between calcium ions and humic acid, and resulted in an increase in the total interaction energy of the water sample, indicating that prechlorination may reduce membrane fouling, due to characteristic changes in organic matter. (C) 2014 Elsevier BY. All rights reserved.
引用
收藏
页码：26 / 35
页数：10
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