Performance of a coagulation-ultrafiltration hybrid process for water supply treatment
Performance of a coagulation-ultrafiltration hybrid process for water supply treatment
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DOI：
10.1016/j.cej.2010.10.076
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发表时间：
2011-01-15
影响因子：
15.1
通讯作者：
Salcedo Vieira, Angelica Marquetotti
中科院分区：
文献类型：
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作者：
Bergamasco, Rosangela;Konradt-Moraes, Leila Cristina;Salcedo Vieira, Angelica Marquetotti
采用天然混凝剂（壳聚糖）和化学混凝剂（硫酸铝），研究了混凝/絮凝与超滤在饮用水处理过程中的联合作用。采用横流过滤原理，在1 bar和2 bar的压力下分别施加0.1 μ m的单通道膜。最终采出水的水质评估考虑了去除颜色、浊度、COD和254 nm紫外线吸收化合物的效率，以及其他物理化学和微生物参数。壳聚糖为混凝剂（CFQ）的混凝/絮凝工艺对增色、增浊化合物和254 nm紫外吸收化合物的去除效果与硫酸铝为混凝剂（CFS）的混凝/絮凝工艺非常相似。对混合系统（CFS-UF和CFQ-UF）的性能评价表明，与单独运行的系统（UF、CFS和CFQ）相比，渗透质量有所提高。CFQ-UF工艺造成了更高的膜污染（2 bar时为79%），但产生了更高的稳定渗透通量，大约是CFS-UF工艺的两倍。由此可见，壳聚糖作为天然混凝剂在CF-UF混合工艺处理高浊度饮用水中具有潜在的应用前景。(C) 2010 Elsevier B.V.版权所有
The combination of coagulation/flocculation and ultrafiltration in the process of drinking water treatment was investigated using natural (chitosan) and chemical (aluminum sulfate) coagulants. A 0.1 mu m single-channel membrane was applied at pressures of 1 bar and 2 bar, using the principle of crossflow filtration. The final produced water quality was assessed considering the efficiency of removal of color, turbidity, COD, and compounds that absorb UV at 254 nm, among other physico-chemical and microbiological parameters. The coagulation/flocculation with chitosan as coagulant (CFQ) was efficient in removing compounds that add color and turbidity and that absorb UV at 254 nm, with levels that were very similar to those obtained with the coagulation/flocculation process with aluminum sulfate as coagulant (CFS). Performance evaluation of the hybrid systems (CFS-UF and CFQ-UF) showed that the permeate quality was increased when compared with individually operated systems (UF,CFS, and CFQ). The CFQ-UF process caused higher membrane fouling (79% at 2 bar), but yielded a higher stabilized permeate flux, which was approximately twice that achieved with CFS-UF. Based on the results, one can say that chitosan has a potential application as natural coagulant in CF-UF hybrid processes for treating drinking water with relatively high turbidity. (C) 2010 Elsevier B.V. All rights reserved.