Degradation of Perfluoro Compounds and F-Recovery in Water Using Discharge Plasmas Generated within Gas Bubbles-猫眼课题宝

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2010

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K. Yasuoka;K. Sasaki;R. Hayashi;A. Kosugi;N. Takeuchi

全氟化合物（PFCs）的分解已成功地证明了使用在水中的氧气泡内产生的DC等离子体。在等离子体反应器中填充全氟辛酸（PFOA）或全氟辛烷磺酸（PFOS）溶液（50 mL，50 mg/L），并在溶液和环形电极之间施加DC电压。DC等离子体在电极的中心孔内开始，并沿着刚好在孔上方形成的氧气泡的内表面沿着略微膨胀。施加电压和放电电流的典型值分别为1.6 kV和7 mA。通过测量溶液中从PFCs中分离的氟离子（F）浓度来评估PFOA/PFOS的分解率。运行30分钟后，全氟辛酸溶液中的氟形成率和能源效率分别为17.4%和61.0毫克/千瓦时，全氟辛烷磺酸溶液中的氟形成率和能源效率分别为11.3%和36.4毫克/千瓦时。通过加入200 mg/L的CaCl 2测试从处理过的溶液中回收氟。基于钙离子浓度的降低，我们估计在10 mA的放电电流下操作30分钟后形成的CaF 2的量为17.7mg/L。关键词-气泡，直流放电，PFCs，PFOA，PFOS，氟离子通讯作者：康冈浩一电子邮件地址：yasuoka@ee.titech.ac.jp发表于2010年6月第七届非热/热等离子体污染控制技术与可持续能源国际研讨会，ISNTP-7 1 k 200 k H. V.电极GND环形电极解决方案

Decomposition of perfluoro compounds (PFCs) has been successfully demonstrated using DC plasmas generated within oxygen bubbles in water. A plasma reactor was filled with perfluorooctanoic acid (PFOA) or perfluorooctanesulfonic acid (PFOS) solution (50 mL, 50 mg/L) and DC voltage was applied between the solution and an annular electrode. DC plasma initiated within the central hole of the electrode and slightly expanded along the inner surface of oxygen bubbles formed just above the hole. The typical values of the applied voltage and discharge current were 1.6 kV and 7 mA, respectively. The decomposition ratio of PFOA/PFOS was evaluated by measuring the concentration of fluorine ions (F) detached from the PFCs in the solution. The F formation ratio and energy efficiency after 30 minutes of operation were 17.4% and 61.0 mg/kWh, respectively, in the PFOA solution and 11.3% and 36.4 mg/kWh, respectively, in the PFOS solution. The recovery of fluorine from the treated solution was tested by adding 200 mg/L of CaCl2. On the basis of the reduction in concentration of calcium ions, we estimated the amount of formed CaF2 to be 17.7 mg/L after 30 minutes of operation at a discharge current of 10 mA. Keywords—Bubble, DC discharge, PFCs, PFOA, PFOS, fluorine ion Corresponding author: Koichi Yasuoka e-mail address: yasuoka@ee.titech.ac.jp Presented at the Seventh International Symposium on NonThermal/Thermal Plasma Pollution Control Technology & Sustainable Energy, ISNTP-7, in June 2010 1 k 200 k H.V. Electrode GND Annular Electrode Solution

Degradation of Perfluoro Compounds and F-Recovery in Water Using Discharge Plasmas Generated within Gas Bubbles

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