一种用于定量评估的新方法
1Green Intelligence Environmental School, Yangtze Normal University, No. 16 Juxian Road, Fuling District, Chongqing 408100, China.
Membranes
|August 27, 2025
概括
度极化显著影响前透膜 (FO) 的性能. 这项研究量化了内部和外部度偏振如何影响透压,揭示了内部 CP
科学领域:
- 膜科学与技术
- 水处理技术
- 化学工程
背景情况:
- 度极化 (CP) 是前透膜 (FO) 过程中的一个主要挑战,降低了运行效率.
- 量化评估CP对于了解其对FO性能有害影响至关重要.
研究的目的:
- 系统地研究不同度极化类型对FO的透压下降的影响.
- 分析吸水溶液 (DS) 和料溶液 (FS) 特性对CP的影响.
- 在FO和压力延迟透 (PRO) 模式下比较CP效应.
主要方法:
- 使用水传递系数 (ηWT) 来量化相对于理论流量的水流量.
- 研究了DS和FS之间的不同度梯度.
- 使用有机FS和脱离离子 (DI) 水进行比较分析.
- 作为DS的不同盐 (CaCl2与NaCl) 的研究效应.
主要成果:
- 水传递系数 (ηWT) 随着度梯度的增加而下降.
- 在FO模式下不同DS时,稀释性内部CP (ICP) 的比例增加,而度外部CP (ECP) 的比例下降.
- 有机FS和更高的FS度加剧了CP效应,减少了水流.
- 作为DS的CaCl2导致了比NaCl更大的效率降低.
- 与FO模式相比,PRO模式显示了较高的水流量,但也显示了较大的流量下降.
结论:
- ECP和ICP都能降低透压力,而ICP则具有主导作用.
- 在FO模式下,稀释性ICP对透压有负面影响,而在PRO模式下,稀释性ECP占主导地位.
- 了解和减轻CP对于优化FO和PRO流程至关重要.
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