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Nanobubbles produced by hydraulic air compression technique
Institution:1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;3.Shanghai Tech University, Shanghai 201210, China;4.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:The anoxia of coastal water has already been a serious problem all over the word. Nanobubbles are proved to have great applications in water remediation because they could effectively increase the oxygen content and degrade organic matters in water. But the existing methods to produce nanobubbles are complicated and high cost to operate, especially in deep sea. In this paper, we presented a low-cost method, hydraulic air compression (HAC), to produce a large number of nanobubbles and proved that nanoscale gas bubbles could be produced by HAC for the first time. Nanoparticle tracking analysis was used to measure the size and concentration of produced nanobubbles. It indicated that the concentration of nanobubbles would increase as the downpipe height increases. Degassed measurements proved that produced “nanoparticles” are gas nanobubbles indeed. More dissolved oxygen in water would provide the source for larger number of nanobubble formation. Those results are expected to be very helpful for water remediation in ocean in the future.
Keywords:nanobubble  water remediation  nanobubble generation  dissolved oxygen  hydraulic air compression  
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