High flux and antifouling properties of negatively charged membrane for dyeing wastewater treatment by membrane distillation
High flux and antifouling properties of negatively charged membrane for dyeing wastewater treatment by membrane distillation
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DOI：
10.1016/j.watres.2016.07.060
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发表时间：
2016-10-15
期刊：
影响因子：
12.8
通讯作者：
Leiknes, TorOve
中科院分区：
文献类型：
--
作者：
An, Alicia Kyoungjin;Guo, Jiaxin;Leiknes, TorOve
研究了膜蒸馏法处理纺织印染废水的适用性。测试了四种不同的染料，包括亚甲基蓝（MB）、结晶紫（CV）、酸性红18（AR 18）和酸性黄36（AY 36）。采用聚四氟乙烯（PTFE）和聚偏氟乙烯（PVDF）两种疏水膜。膜的特征在于通过测试对每种染料（污垢-污垢）和膜染料（膜污垢）的界面相互作用，并确定其机制。MD膜具有负电荷，这有利于处理相同电荷的酸性和偶氮染料，并显示出更高的通量。另外，PTFE膜降低了润湿性，膜表面的疏水性更高。PTFE膜尤其证明了其对染料吸收的抗性，因为其强负电荷和化学结构导致在膜表面上而不是在膜孔中形成片状（松散）染料结构。这也使得能够通过水冲洗（WF）恢复通量和膜性能，从而直接接触MD与PTFE膜处理100 mg/L的染料混合物在5天的操作期间显示稳定的通量和上级颜色去除。因此，MD显示出与简单的膜清洗过程相结合的稳定的长期操作的潜力，以及其在染色废水处理中的适用性。(C)2016爱思唯尔有限公司版权所有
This study investigated the applicability of membrane distillation" (MD) to treat dyeing wastewater discharged by the textile industry. Four different dyes containing methylene blue (MB), crystal violet (CV), acid red 18 (AR18), and acid yellow 36 (AY36) were tested. Two types of hydrophobic membranes made of polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) were used. The membranes were characterized by testing against each dye (foulant-foulant) and the membrane dye (membranefoulant) interfacial interactions and their mechanisms were identified. The MD membranes possessed negative charges, which facilitated the treatment of acid and azo dyes of the same charge and showed higher fluxes. In addition, PTFE membrane reduced the wettability with higher hydrophobicity of the membrane surface. The PTFE membrane evidenced especially its resistant to dye absorption, as its strong negative charge and chemical structure caused a flake-like (loose) dye dye structure to form on the membrane surface rather than in the membrane pores. This also enabled the recovery of flux and membrane properties by water flushing (WF), thereby direct-contact MD with PTFE membrane treating 100 mg/L of dye mixtures showed stable flux and superior color removal during five days operation. Thus, MD shows a potential for stable long-term operation in conjunction with a simple membrane cleaning process, and its suitability in dyeing wastewater treatment. (C) 2016 Elsevier Ltd. All rights reserved.