溶液pH值对微纳米气泡减轻超滤膜污染影响研究

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摘要为有效解决膜过滤过程中由于膜污染加剧而导致分离效率下降的问题,提出引入微纳米气泡工艺,研究了pH值为3.0、6.0和10.0时微纳米气泡(MNBs)对超滤过程的影响,通过扫描电镜和聚焦离子束电子束双束显微镜分析了膜表面污染。实验结果表明pH值为3.0、6.0和10.0时鼓入MNBs后超滤归一化通量分别为0.96、1.19和1.14。pH值为3.0时鼓入MNBs对腐植酸(HA)截留率无明显增强,pH值为6.0和10.0时鼓入MNBs后截留率分别提高了12.7%和10.0%。超滤膜表面滤饼层厚度随pH值增大而减小,鼓入MNBs后滤饼层疏松多孔,有效减弱了归一化通量下降。

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	李香香
	韩煦

关键词：超滤微纳米气泡腐植酸 pH值

Abstract： In order to alleviate the decrease of separation efficiency caused by the aggravation of membrane fouling during ultrafiltration (UF) process, the micro-nano bubbles process was proposed. In this study, the influences of MNBs on the UF processes at pH 3.0, 6.0 and 10.0 were studied. The fouling of membrane surface was analyzed by scanning electron microscope (SEM) and focused ion beam dual beam microscopy (FIBDBM). The results showed that the normalized fluxes were 0.96, 1.19 and 1.14 at pH 3.0, 6.0 and 10.0, respectively, with MNBs input during UF processes. MNBs had no significant effect on the rejection coefficient at pH 3.0 during HA UF process. The rejection coefficient increased by 12.7% and 10.0% at pH 6.0 and 10.0, respectively. The thickness of cake layer decreased with pH increasing. The cake layer was loose and porous with MNBs input, weakening the decline of the normalized flux.

Keywords： ultrafiltration micro-nanobubbles humic acid (HA) pH

Received 2021-12-17;

Fund:国家自然科学基金重点基金(51638011)和国家自然科学基金(51978455和51878449)。

Corresponding Authors: 韩煦,副教授,E-mail:xuhan@tju.edu.cn。 Email: xuhan@tju.edu.cn

About author: 李香香(1996-),女,硕士研究生,现从事超滤膜法水处理方面的研究。

引用本文:

李香香, 韩煦.溶液pH值对微纳米气泡减轻超滤膜污染影响研究[J]. 化学工业与工程, 2022,39(5): 90-96

LI Xiangxiang, HAN Xu.Effect of pH on micro-nano bubbles to alleviate ultrafiltration membrane fouling[J]. Chemcial Industry and Engineering, 2022,39(5): 90-96

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