超抗湿膜用于膜蒸中的超盐水结晶
Ruixue Zhao1,2, Fanxu Meng1, Qinghao Wu1
1The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environment Sciences and Engineering, Peking University, Beijing 100871, China.
Environmental science & technology
|August 10, 2024
概括
这项研究开发了一种用于高盐水处理的新型复合膜,克服了膜蒸 (MD) 中的膜湿问题. 这种先进的膜可以实现高效的盐结晶和零液体排出 (ZLD) 应用.
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:
- 膜蒸 (MD) 显示出对高盐水管理和零液体排放 (ZLD) 的承诺.
- 膜湿是MD在高盐度应用中的一个主要限制.
- 现有的技术在极端盐度和结晶方面扎.
研究的目的:
- 合成和评估一种新型复合膜,用于用直接结晶处理高盐水.
- 为了解决ZLD的膜蒸中的膜湿问题.
- 为了证明膜在超和溶液中的性能,并实现高盐产量.
主要方法:
- 复合膜的制造方法是用聚胺,阴离子交换层 (CEL) 和阴离子交换层 (AEL) 覆盖防水膜.
- 在直接接触膜蒸 (DCMD) 中测试复合膜,使用100gL-1NaCl溶液.
- 通过长期运行 (360小时) 和离子扩散分析来评估膜防湿稳定性.
主要成果:
- 复合膜从盐溶液中获得38.0%的盐晶产量,透度<5毫克L-1 .
- 经过360小时的连续运行,证明了超高的防湿稳定性.
- 双极CEL和AEL有效消除了离子交叉,提高了防湿性.
结论:
- 开发的复合膜为高盐水处理和直接结晶提供了卓越的性能.
- 这种膜技术解决了MD的关键局限性,为高效的ZLD铺平了道路.
- 这项研究为管理高度缩的盐水提供了传统海水淡化的一个有希望的替代方案.
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