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Research on the degradation mechanism of dimethyl phthalate in drinking water by strong ionization discharge

Plasma Science and Technology 2018年第3期20卷 112-121页

作者：赵红依成武依蓉婕王慧娟尹兰兰 I N MUHAMMAD 马中飞 School of the Environment and Safety Engineering Jiangsu University

The degradation mechanism of dimethyl phthalate（DMP） in the drinking water was investigated using strong ionization discharge technology in this study. Under the optimized condition, the degradation efficiency of DMP in drinking water was up to 93% in 60 min. A series of analytical techniques including high-performance liquid chromatography, liquid chromatography mass spectrometry, total organic carbon analyzer and ultraviolet–visible spectroscopy were used in the study. It was found that a high concentration of ozone（O_3） produced by dielectric barrier discharge reactor was up to 74.4 mg l^（-1） within 60 min. Tert-butanol, isopropyl alcohol,carbonate ions（CO_3^（2-）） and bicarbonate ions （HCO_3^-） was added to the sample solution to indirectly prove the presence and effect of hydroxyl radicals（·OH）. These analytical findings indicate that mono-methyl phthalate, phthalic acid（PA） and methyl ester PA were detected as the major intermediates in the process of DMP degradation. Finally, DMP and all products were mineralized into carbon dioxide（CO_2） and water（H_2O） ultimately. Based on these analysis results, the degradation pathway of DMP by strong ionization discharge technology were proposed.

关键词： strong ionization discharge dimethyl phthalate active particles

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Research on generating high-concentration solution of reactive oxygen species（ROS） by strong-field ionization discharge

Research on generating high-concentration solution of reacti...

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中国物理学会第十八届全国静电学术会议

作者： LI Rihong BAI Mindong XU Shujing TIAN Yiping LI Yanjian YANG Haidong Institute of Marine Engineering Department of Physics Dalian Maritime University College of Environment and Ecology Xiamen University

In this paper, the method of strong ionization discharge was used to generate high concentration reactive oxygen species（ROS）, and ROS solution was produced by injecting the active species into water, which was rich in hydroxyl radical（·OH）. To optimize the generating condition of high-concentration solution of reactive oxygen species（ROS）, and provide a basis of system optimized parameters for generating plant of ROS solution, the effects of several parameters on the concentration of ROS solution were investigated, including water temperature, water p H, O2 input, ROS dosages, pressure of system（including pneumatic pressure of venturi and miscibility pressure）, etc. ROS dosages was represented by O3, which was measured by ozone monitor;ROS in water was catched by DPD（N,N-diethyl-p-p Henylenediamine）, with the concentration denoted by CRS, which was measured by DPD spectrophotometric. Both water temperature and p H value were significant negative correlation with CRS（p＜0.01）;ROS dosages was significant correlation with CRS（p＜0.01）;both O2 input and pneumatic pressure of venturi were not significant correlation with CRS（p＞0.05）. The difference of CRS was not significant（p＞0.05）among water temperature of 16℃, 20℃, 24.5℃, as well as water p H of 6.5 and 7.0, O2 input of 2L/min and 3L/min（p＞0.05）, while the difference was highly significant（p＜0.01） or significant（p＜0.05）under the other water temperature, water p H, and O2 input;CRS significantly increased with the decrease of miscibility pressure（p＜0.01）, which was significantly affected by the interaction between miscibility pressure and O2 input under higher ROS dosages（p＜0.01）;the CRS under pneumatic pressure of venturi of 0.05 bar was significant higher than that of the other pneumatic pressure of venturi（p＜0.05）.Lower water temperature, lower p H level, higher ROS dosages, and lower miscibility pressure were all benefite to increase the concentration of ROS（CRS）, which was significantly affected by the change of se

关键词： strong ionization discharge reactive oxygen species(ROS) advanced oxidation technologies hydroxyl radical concentration of reactive oxygen species(ROS) solution(CRS)

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Research on quinoline degradation in drinking water by a large volume strong ionization dielectric barrier discharge reaction system

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Plasma Science and Technology 2021年第8期23卷 135-149页

作者： Rongjie YI Chengwu YI Daolin DU Qi ZHANG Haijun YU Liu YANG School of Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013People's Republic of China

Quinoline is widely used in the production of drugs as a highly effective insecticide,and its derivatives can also be used to produce *** has a teratogenic carcinogen to wildlife and humans once entering into the aquatic *** this study,the degradation mechanism of quinoline in drinking water by a strong ionization dielectric barrier discharge(DBD)lowtemperature plasma with large volume was *** concentration of hydroxyl radical(·OH)(0.74 mmol l^(-1))and ozone(O3)(58.2 mg l^(-1))produced by strongly ionized discharge DBD system were quantitatively analyzed based on the results of electron spin resonance and O3 *** influencing reaction conditions of input voltages,initial pH value,·OH inhibitors,initial concentration and inorganic ions on the removal efficiency of quinoline were systematically *** obtained results showed that the removal efficiency and TOC removal of quinoline achieved 94.8%and 32.2%,degradation kinetic constant was 0.050 min^(-1) at 3.8 k V and in a neutral pH(7.2).The proposed pathways of quinoline were suggested based on identified intermediates as hydroxy pyridine,fumaric acid,oxalic acid,and other small molecular acids by high-performance liquid chromatography/tandem mass spectrometry ***,the toxicity analysis on the intermediates demonstrated that its acute toxicity,bioaccumulation factor and mutagenicity were *** overall findings provided theoretical and experimental basis for the application of a high capacity strong ionization DBD water treatment system in the removal of quinoline from drinking water.

关键词： dielectric barrier discharge hydroxyl radical ozone quinoline strong ionization discharge toxicity

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Study on the Removal of SO_2 from Simulated Flue Gas Using Dry Calcium-Spray with DBD Plasma

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Plasma Science and Technology 2008年第1期10卷 106-110页

作者：依成武吴春笃陈志刚欧红香邵学军 School of Environment University of Jiangsu Zhenjiang 212013 China

In this study, lime-hydrate （Ca（OH）2） desulfurizer was treated by plasma with strong ionization discharge of a dielectric barrier. The removal of SO2 from simulated flue gas was investigated. The principles of SO2 removal are discussed. Several factors affecting the efficiency of SO2 removal were studied. They included the ratio of calcium to sulfur （Ca/S）, desulfurizer granularity, residence time of the flue gas, voltage applied to the discharge electrode in the plasma generator, and energy consumption. Experimental results indicate that the increase in Ca/S ratio, the applied voltage and discharge power, the residence time, and the reduction in the desulfurizer granularity all can raise the SO2 removal efficiency. The SO2 removal efficiency was up to 91.3% under the following conditions, namely a primary concentration of SO2 of 2262×10^-6 （v/v） in the emission gas, 21%（v/v） of oxygen, 1.8% （v/v） of water, a Ca/S ratio of 1.48, a residence time of 2.8 s, a 3.4 kV voltage and a 10kHz frequency power applied to the discharge electrodes in the plasma generator, and a flow rate of 100 m^3/h for emission gas.

关键词： plasma strong ionization discharge Ca(OH)2 SO2 removal of SO2

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Treatment of microalgae in ballast water using hydroxyl radical based on the D-2 ballast water discharge standard

Treatment of microalgae in ballast water using hydroxyl radi...

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中国物理学会第十八届全国静电学术会议

作者： MENG Xiang-ying CHEN Cao BAI Min-dong SUN Jian MENG Fan-peng Institute of Marine Engineering Department of Physics Dalian Maritime University College of Environment and Ecology Xiamen University

In this paper, the effect of hydroxyl radical（·OH） on microalgae in ballast water was experimentally *** the method of strong ionization discharge of dielectric barrier, large numbers of ·OH were produced to be dissolved into ballast water to kill the *** the concentration of total residual antioxidant（TRO） was about 1.9 mg/L, the maximum concentration of killed algae was about 12 000 cell/m L. The microalgae did not reactivate when detected at 48 hours and 120 hours, respectively. The contents of chlorophyl-a, chlorophyl-b and chlorophyl-c were decreased by 50%–80%, which is primary reason leading the death of microalgae. The water quality was back to normal level after 120 hours which was no secondary pollution to aquatic organisms and *** results indicated that the D-2 ballast water discharge standard of IMO was satisfied and ·OH is an ideal green medicamen for killing microalgae in the course of conveying ship’s ballast water.

关键词： hydroxyl radical(·OH) strong ionization discharge microalgae chlorophyll water quality

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Study on Dry Type Calcium-sprayed Desulphurization by Plasma

Study on Dry Type Calcium-sprayed Desulphurization by Plasma

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亚太绿色氧化还原技术国际研讨会

作者： Wu Chundu Yi Chengwu* Ou Hongxiang Chu Jinyu Yan Jun Jiangsu University Environmental College Zhenjiang China 212013

The lime-hydrate(Ca(OH)2)desulfurizer is treated by plasma with strong ionization discharge of dielectric barrier, study of De-SO2 from simulative flue gas has been performed in this paper, and desulf

关键词： plasma strong ionization discharge Ca(OH)2 SO2 desulfurization

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