Nanobubbles for the Mitigation of Fouling in Wastewater Distribution Systems

文献类型： 外文期刊

第一作者： Xiao, Yang

作者： Xiao, Yang;Zhou, Bo;Tan, Siyuan;Muhammad, Tahir;Si, Buchun;Li, Yunkai;Xiao, Yang;Zhou, Bo;Li, Yunkai;Li, Lei;Ma, Changjian;Jiang, Sunny C.

作者机构：

关键词： Biofouling; Scaling; Colloidal fouling; Wastewater; Antifouling mechanism

期刊名称：ENGINEERING （ 影响因子：10.1； 五年影响因子：11.6 ）

ISSN： 2095-8099

年卷期： 2024 年 35 卷

页码：

收录情况： SCI

摘要： The increasing demand for wastewater treatment has become a notable trend for addressing global water scarcity. However, fouling is a significant challenge for wastewater distribution engineering systems. This study provides an approach using nanobubbles (NBs) to control fouling. The antifouling capacities of three types of NBs, six oxygen concentrations, and two application procedures (prevention and removal) are investigated. The results show that NBs effectively mitigate composite fouling-including biofouling, inorganic scaling, and particulate fouling-in comparison with the non-NBs group. More specifically, hydroxyl radicals generated by the self-collapse of NBs oxidize organics and kill microorganisms in wastewater. The negatively charged surfaces of the NBs transform the crystalline form of CaCO3 from calcite to looser aragonite, which reduces the likelihood of ion precipitation. Furthermore, the NBs gas-liquid interfaces act as gas "bridges" between colloidal particles, enhancing the removal of particles from wastewater. Lastly, although the NBs inhibit the growth of fouling, they do not significantly remove the already adhered fouling in non-NBs treated groups. This study anticipates that the application of NBs will address the significant fouling issue for various wastewater distribution engineering systems in order to meet the global challenge of sustainable water supplies. (c) 2024 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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