Towards a better hydraulic cleaning strategy for ultrafiltration membrane fouling by humic acid: Effect of backwash water composition

被引：0
作者：
Haiqing Chang [1 ]
Heng Liang [1 ]
Fangshu Qu [1 ]
Jun Ma [1 ]
Nanqi Ren [1 ]
Guibai Li [1 ]
机构：
[1] State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology
来源：
Journal of Environmental Sciences | 2016年 / 05期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Ultrafiltration; Membrane fouling; Hydraulic cleaning; Backwash water composition; Humic acid;
D O I：
暂无
中图分类号：
TU991.2 [净水工程（给水处理）];
学科分类号：
0815 ;
摘要：
As a routine measurement to alleviate membrane fouling, hydraulic cleaning is of great significance for the steady operation of ultrafiltration(UF) systems in water treatment processes. In this work, a comparative study was performed to investigate the effects of the composition of backwash water on the hydraulic cleaning performance of UF membranes fouled by humic acid(HA). Various types of backwash water, including UF permeate, Milli-Q water, Na Cl solution, CaClsolution and HA solution, were compared in terms of hydraulically irreversible fouling index, total surface tension and residual HA. The results indicated that Milli-Q water backwash was superior to UF permeate backwash in cleaning HA-fouled membranes, and the backwash water containing Na+or HA outperformed Milli-Q water in alleviating HA fouling. On the contrary, the presence of Cain backwash water significantly decreased the backwash efficiency. Moreover, Caplayed an important role in foulant removal, and the residual HA content closely related to the residual Cacontent.Mechanism analysis suggested that the backwash process may involve fouling layer swelling, ion exchange, electric double layer release and competitive complexation. Ion exchange and competitive complexation played significant roles in the efficient hydraulic cleaning associated with Na+and HA, respectively.
引用
收藏
页码：177 / 186
页数：10
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