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《工程(英文)》 >> 2024年 第35卷 第4期 doi: 10.1016/j.eng.2023.10.013

利用纳米气泡控制农业废水灌溉系统复合污垢的机制

a College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
b Engineering Research Center for Agricultural Water-Saving and Water Resources (Ministry of Education of the People's Republic of China), China Agricultural University, Beijing 100083, China
c School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
d State Key Laboratory of Nutrient Use and Management, Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan 250100, China
e Department of Civil and Environmental Engineering, University of California-Irvine, Irvine, CA 92617, USA

收稿日期: 2023-02-12 修回日期: 2023-09-05 录用日期: 2023-10-08 发布日期: 2024-01-18

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摘要

The increasing demand for wastewater treatment has become a notable trend for addressing global water scarcity. However, composite fouling is a significant challenge for wastewater distribution engineering systems. This study provides an approach using nanobubbles (NBs) to control composite fouling. The antifouling capacities of three types of NBs (oxygen, nitrogen, and helium), 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 no-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. While oxygen NBs have greater anti-fouling capacity than nitrogen and helium NBs, oxygen NBs at low concentrations (∼5%) increase total fouling. Lastly, although the NBs inhibit the growth of fouling, they do not significantly remove the already adhered fouling in no-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.

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