提高水反透膜性能的多维参数研究,适用于低盐度料的海水淡化
Utpal G Thummar1,2, Govind Amaliar1, Bhaumik Sutariya1,2
1Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India.
概括
处理后的反透膜 (RO) 增强了水的净化. 这种方法改善了透流量,并允许控制盐的排斥,以节能淡化低水.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 反透 (RO) 是从盐水源生产清洁饮用水的关键技术.
- 定制RO膜用于特定的水源,特别是低水,需要平衡盐排斥和透流量.
- 低水的有效淡化需要最小的盐分去除,同时最大限度地提高水流量.
研究的目的:
- 开发和评估一种膜后处理方法,用于控制盐排放和提高低水淡化中的透流.
- 为了研究后处理后RO膜的物理和化学变化.
- 评估开发后处理过程的可扩展性和商业潜力.
主要方法:
- 内部开发的RO膜经过使用N,N-二甲基形式胺和甘油水溶液的后处理.
- 后处理参数,包括干燥时间,在优惠券水平上有所变化.
- 该过程扩展到模块级,以评估商业可行性.
主要成果:
- 在优惠券水平上,透流量从3.7±0.9增加到10.6±0.2 L/m2·h·bar,而盐排斥量则从95.6±1%减少到70.5±1% (2,000 ppm NaCl 料).
- 在模块层面,实现了12.8L/m2·h·bar的透流和55.5%的盐排斥.
- 后处理诱导的物理变化,如聚合物胀,而不会改变膜的化学结构.
结论:
- 膜后处理为增强透流量和在RO系统中实现可控盐排斥提供了可行的策略.
- 观察到的物理变化,特别是聚合物膨胀,是提高性能的原因.
- 这种方法具有很大的潜力,可以为低水源开发更节能的海水淡化应用.
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