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引用本文:余萍萍,王敬富,陈敬安,张耀,陈权,卢耀庭.纳米气泡改性矿物颗粒的湖泊沉积物-水界面增氧效果实验研究.湖泊科学,2019,31(1):65-71. DOI:10.18307/2019.0106
YU Pingping,WANG Jingfu,CHEN Jing'an,ZHANG Yao,CHEN Quan,LU Yaoting.Experimental study on the oxygenation efficiency of nano-bubble modified mineral particles at the sediment-water interface in lakes. J. Lake Sci.2019,31(1):65-71. DOI:10.18307/2019.0106
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纳米气泡改性矿物颗粒的湖泊沉积物-水界面增氧效果实验研究
余萍萍1,2, 王敬富2, 陈敬安2, 张耀3, 陈权2,4, 卢耀庭2,4
1.贵州大学资源与环境工程学院, 贵阳 550025;2.中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550081;3.贵州师范大学地理与环境科学学院, 贵阳 550001;4.中国科学院大学, 北京 100049
摘要:
季节性缺氧导致夏季沉积物内源磷强烈释放,加剧水体富营养化,是我国西南地区深水湖泊(水库)面临的重要挑战.有效增加夏季缺氧期深水沉积物-水界面的含氧量,是减少内源磷释放的关键.现有的深水增氧技术由于缺乏对沉积物-水界面增氧的针对性,因此治理效果有限.近年来,纳米气泡已被证实具有的稳定性好、氧传质速率高和环境风险低等优点,为新型深水增氧技术研发提供了巨大潜力.本文以天然矿物材料白云母、绢云母、硅藻土和沸石为基底,负载纳米气泡,研发纳米气泡改性矿物颗粒技术,开展湖泊沉积物-水界面增氧模拟实验研究,运用平面光电极技术评估其界面增氧效果.结果表明,纳米气泡改性矿物颗粒对沉积物-水界面具有比较明显的增氧效果.其中,改性白云母、绢云母和沸石的界面持续增氧时间可达7天以上,增氧后的界面最大溶解氧(DO)浓度达4.40 mg/L,而改性硅藻土不具有增氧能力.其次,矿物粒度对改性颗粒的增氧效果有一定影响:粒度越细,界面的最大增氧浓度越高,且持续增氧时间越长.纳米气泡改性矿物颗粒技术有望成为夏季缺氧期深水沉积物-水界面精准增氧和内源污染控制的有效技术手段.
关键词:  纳米气泡  天然矿物  沉积物-水界面增氧  平面光电极技术
DOI:10.18307/2019.0106
分类号:
基金项目:贵州省重大应用基础研究计划项目(黔科合重大字[2015]2001)和贵州省科技计划项目(黔科合[2016]支撑2802号)联合资助.
Experimental study on the oxygenation efficiency of nano-bubble modified mineral particles at the sediment-water interface in lakes
YU Pingping1,2, WANG Jingfu2, CHEN Jing'an2, ZHANG Yao3, CHEN Quan2,4, LU Yaoting2,4
1.College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, P. R. China;2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, P. R. China;3.College of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550001, P. R. China;4.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Seasonal hypoxia that enhancing the release of phosphorus from sediment in summer and exacerbating the water eutrophication is a big challenge for deep-water lakes (reservoirs) in southwest China. Increasing the oxygen level of the sediment-water interface (SWI) during summer anoxic periods is the key to reduce the internal phosphorus release. The existing deep water oxygenation technology has limited efficiency due to lacking pertinence to the SWI. In recent years, the nano-bubbles provide great potential for the development of a new oxygenation technology, which have advantages of good stability, high oxygen mass transfer rate and low environmental risk. In this study, the natural minerals, i.e., white mica, sericite, diatomite and zeolite, were modified by nano-bubbles to develop a new oxygenation technology. Simulation experiments were conducted to assess the efficiency of the newly established oxygenation technology by using planar luminescent optode technology. Our results showed that the nano-bubbles modified mineral particles obviously increased the oxygen concentrations of the SWI. The duration of continuous oxygenation for white mica, sericite and zeolite can be over 7 days, while maximum dissolved oxygen concentration at the SWI was more than 4.40 mg/L. The modified diatomite had no ability to increase oxygen level of the SWI. Minerals with fine grain size have the stronger oxygenation efficiency and the longer oxygenation duration. The nano-bubbles modified mineral technology provides new technical support for the precise oxygenation of SWI and effective control of sediment pollution in lakes.
Key words:  Nano-bubbles  natural minerals  oxygenation of the sediment-water interface  planar luminescent optode technology
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