Effect of pH on micro-nano bubbles to alleviate ultrafiltration membrane fouling

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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.

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	LI Xiangxiang
	HAN Xu

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

Received 2021-12-17;

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LI Xiangxiang, HAN Xu.Effect of pH on micro-nano bubbles to alleviate ultrafiltration membrane fouling[J] Chemcial Industry and Engineering, 2022,V39(5): 90-96

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