Advanced treatment of a complex pharmaceutical wastewater by nanofiltration: Membrane foulant identification and cleaning
Advanced treatment of a complex pharmaceutical wastewater by nanofiltration: Membrane foulant identification and cleaning
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纳滤深度处理复杂制药废水：膜污染物识别与清洗
DOI：
10.1016/j.desal.2009.08.005
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发表时间：
2010-02
期刊：
影响因子：
9.9
通讯作者：
Wei Xinyu
中科院分区：
文献类型：
--
作者：
Fan Fanghui;Wang Zhi;Wang Shichang;Wang Jixiao;Wei Xinyu
采用Desal-5DK纳滤膜对复杂制药废水进行深度处理.对膜污染及化学清洗进行了研究。结果表明，在纳滤膜运行初期，碳酸钙和硫酸盐的沉积是造成膜污染的主要原因。在膜污染后期，除钙盐外，含有羧酸、酰胺、卤代烷等官能团的复杂有机污染物也沉积在膜表面，逐渐形成致密的污染层。因此，在清洗过程中，清洗剂的效率取决于其通过与污垢反应来破坏致密污垢层的完整性的能力。结果表明，清洗剂的清洗效果依次为NaOH（pH 11）<HCl（pH 2）<柠檬酸（pH 2）<EDTA（10 mM）。EDTA清洗60 min后，膜通量恢复率达99.0%。经EDTA清洗后的膜的SEM图像和元素含量与未清洗的膜非常相似。
Advanced treatment of a complex pharmaceutical wastewater by Desal-5 DK nanofiltration (NF) membrane was carried out. The membrane fouling and chemical cleaning in this application were investigated. It was found that at the initial stage of NF process, the deposition of sulfate and carbonate of calcium was the main cause of membrane fouling. At the later fouling stage, besides calcium salts, complex organic foulants containing carboxyl acid, amide, and alkyl halide functional groups also deposited onto membrane surface and gradually formed a densely packed fouling layer. Accordingly, in cleaning process, the efficiency of a cleaning agent depended on its ability to break down the integrity of the compact fouling layer by reacting with the foulants. The results showed that the cleaning efficiencies of the agents increased in the sequence of NaOH (pH 11)<HCl (pH 2)<citric acid (pH 2)<EDTA (10mM). After cleaning with EDTA for 60min, the membrane flux recovery ratio reached 99.0%. The SEM image and element content of the membrane cleaned by EDTA were quite similar to those of the virgin membrane.
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