【摘 要】
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Microbubbles have large specific interfacial area, low rising velocity, high inner pressure, and high electricity on the surface.The bubbles absorb hydrophobic materials suspended in water.In this stu
【机 构】
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Department of Chemical Engineering, Nagoya University, Furocho, Chikusaku, Nagoya 464-8603 Japan
【出 处】
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The 6th Joint China-Japan Chemical Engineering Symposium(第六届
论文部分内容阅读
Microbubbles have large specific interfacial area, low rising velocity, high inner pressure, and high electricity on the surface.The bubbles absorb hydrophobic materials suspended in water.In this study, in order to separate oil from O/W emulsion in wastewater, the bubble column dispersed with microbubbles was used.The effects of sample and operation conditions on the oil collection performance were investigated.A microbubble generator utilizing liquid shear stress, which consisted of a liquid pump and a special line mixer, was set below the column bottom.For the comparison, also a sintered glass gas sparser was used to generate millimeter sized bubbles.The O/W emulsion was prepared from the mixture of canola oil and tap water.At the top of bubble column, the oil phase amount separated from O/W emulsion was measured and the oil collection ratio was calculated.The oil collection ratio for microbubbles was higher than those for millibubbles and no bubbles.The oil collection ratio for microbubbles had maximum value against gas flow rate.The oil collection ratio at pH =3 was much higher than that at pH =7.Since the surface of oil droplet in O/W emulsion was negatively charged and the surface of microbubbles at pH =3 was positive charge, the microbubbles adsorbed strongly oil droplet.
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