Impacts of Calcium Addition on Humic Acid Fouling and the Related Mechanism in Ultrafiltration Process for Water Treatment.
Impacts of Calcium Addition on Humic Acid Fouling and the Related Mechanism in Ultrafiltration Process for Water Treatment.
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DOI：
10.3390/membranes12111033
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发表时间：
2022-10-23
期刊：
影响因子：
4.2
通讯作者：
Lin H
中科院分区：
文献类型：
--
作者：
Zou H;Long Y;Shen L;He Y;Zhang M;Lin H
腐殖酸（HA）是一种主要的天然有机污染物，与钙离子（Ca 2+）广泛共存于天然水体和废水中，混凝-超滤工艺是地表水处理最典型的解决方案。然而，在超滤过程中，Ca ~（2+）对HA污染的影响却知之甚少。本研究探讨了Ca 2+添加在HA污染中的作用以及Ca 2+添加在混凝-超滤工艺中减轻污染的潜力。结果表明，当Ca ~（2+）浓度从0增加到5.0mM时，HA溶液的过滤通量增加，相应的水力过滤阻力减小。但各阻力组分在总水力过滤阻力中的比例和贡献随Ca 2+浓度的变化趋势不同。随着Ca ~（2+）添加量的增加（0 ~ 5.0 mM），膜内堵塞阻力（9.02%~ 4.81%）和浓差极化阻力（50.73%~ 32.17%）在总水力阻力中的作用减弱，但膜表面存款阻力（33.93%~ 44.32%）增加。一系列的表征和热力学分析一致表明，由Ca 2+桥接效应引起的粒径增大是HA溶液过滤阻力降低的主要原因。本研究揭示了Ca 2+对HA污染的影响，并论证了在超滤过程中添加Ca 2+以减轻HA污染的可行性。
Humic acid (HA) is a major natural organic pollutant widely coexisting with calcium ions (Ca2+) in natural water and wastewater bodies, and the coagulation–ultrafiltration process is the most typical solution for surface water treatment. However, little is known about the influences of Ca2+ on HA fouling in the ultrafiltration process. This study explored the roles of Ca2+ addition in HA fouling and the potential of Ca2+ addition for fouling mitigation in the coagulation-ultrafiltration process. It was found that the filtration flux of HA solution rose when Ca2+ concentration increased from 0 to 5.0 mM, corresponding to the reduction of the hydraulic filtration resistance. However, the proportion and contribution of each resistance component in the total hydraulic filtration resistance have different variation trends with Ca2+ concentration. An increase in Ca2+ addition (0 to 5.0 mM) weakened the role of internal blocking resistance (9.02% to 4.81%) and concentration polarization resistance (50.73% to 32.17%) in the total hydraulic resistance but enhanced membrane surface deposit resistance (33.93% to 44.32%). A series of characterizations and thermodynamic analyses consistently suggest that the enlarged particle size caused by the Ca2+ bridging effect was the main reason for the decreased filtration resistance of the HA solution. This work revealed the impacts of Ca2+ on HA fouling and demonstrated the feasibility to mitigate fouling by adding Ca2+ in the ultrafiltration process to treat HA pollutants.
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