scholarly journals A Study of the Performance of Dielectric Barrier Discharge under Different Conditions for Nitrobenzene Degradation

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 842 ◽  
Author(s):  
Muhammad Imran Nawaz ◽  
Chengwu Yi ◽  
Prince Junior Asilevi ◽  
Tingting Geng ◽  
Muhammad Aleem ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Advanced Oxidation Processes ◽  
Barrier Discharge ◽  
Input Power ◽  
Active Species ◽  
Degradation Efficiency ◽  
Energy Yield ◽  
Dielectric Barrier ◽  
Enormous Amount

Water scarcity and water contamination due to the extensive use of organic compounds in industries trigger us to adopt modern techniques for wastewater treatment. In this research, we developed a new dielectric barrier discharge (DBD) system which was evaluated for the degradation of nitrobenzene in water under different experimental arrangements. DBD produces an enormous amount of active species like O3, •O, O2+ and O2− and •OH to degrade the pollutants. In this study, NB (Nitrobenzene) was treated from wastewater by changing the gas flow rate, adopting different carrier gas, by adding inhibitors and promoters and the effect of applied voltage on the production of active species to check the effectiveness of the DBD system. The DBD system was evaluated based on input power, degradation efficiency and energy yield compared with other advanced oxidation processes. The energy yield of the DBD system was 1.253 mg/kWh for the degradation of 20 mg/L of NB to 75% in 60 min with the discharge power of 0.538 W, which displays better results in comparison with the other AOPs regarding energy yield and the degradation efficiency of the pollutant. The results illustrate the significance of the system and further suggest its application to industrial-scale treatment.

Degradation of Aqueous 3, 4-Dichloroaniline by Wire-Cylinder Dielectric Barrier Discharge Reactor

2012 ◽  
Vol 518-523 ◽  
pp. 1729-1732
Author(s):  
Jing Wei Feng ◽  
Chao Shi ◽  
Fang Fang Ding ◽  
Wen Jing Wang
Keyword(s):  
Dielectric Barrier Discharge ◽  
Ozone Concentration ◽  
Barrier Discharge ◽  
Ph Value ◽  
Input Power ◽  
Degradation Efficiency ◽  
Solution Ph ◽  
Dielectric Barrier ◽  
Ph Values ◽  
Dielectric Barrier Discharge Reactor

Degradation of aqueous 3, 4-dichloroaniline (3, 4-DCA) by wire-cylinder dielectric barrier discharge reactor was carried out in the present paper. Generation of reactive species was analyzed, changes of aqueous ozone concentration and solution pH values were examined; meanwhile, the effect of input power and initial pH value on the degradation efficiency of 3, 4-DCA were investigated. The results showed that the degradation efficiency of 3, 4-DCA increased with increasing input power when the input power was increased from 70 W to 90 W, while it decreased with increasing input power when the input power was increased from 90 W to 110 W; and the same changing trend was observed in the change of aqueous ozone concentration. At alkaline conditions and acidic conditions, 3, 4-DCA degradation rate was significantly higher than that of neutrality conditions. In addition, there was a remarkable decline of the solution pH values during 3, 4-DCA degradation.

scholarly journals Degradation of Methylene Blue via Dielectric Barrier Discharge Plasma Treatment

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1818 ◽  
Author(s):  
Lihang Wu ◽  
Qinglong Xie ◽  
Yongbo Lv ◽  
Zhenyu Wu ◽  
Xiaojiang Liang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Plasma Reactor ◽  
Chemical Oxidation ◽  
Active Species ◽  
Initial Solution ◽  
Energy Yield ◽  
Dbd Plasma ◽  
Dielectric Barrier

The degradation of methylene blue (MB) using an upgraded dielectric barrier discharge (DBD) plasma reactor was investigated in this paper. Air plasma was generated in the glass bead packed bed in the reactor, which was propagated into MB solution through a microporous diffuser plate. Microdischarge phenomenon can be observed on the interface of MB solution and the diffuser plate, where plasma active species were generated. The effects of air flow rate, initial solution concentration, initial solution pH, and initial solution conductivity on MB degradation were examined. Experimental results indicated that the proposed plasma reactor was effective for MB degradation. No obvious change in MB degradation efficiency was obtained for solution with various initial pH and conductivities, which suggested the potential of the reactor in actual wastewater treatment. The possible mechanism of the generation of plasma active species for MB degradation was proposed. In addition, the total organic carbon removal and chemical oxidation demand removal after 30 min treatment were 38.5% and 48.3%, which was higher than that obtained by ozone. The energy yield for MB degradation reached up to 9.3 g/kWh. Finally, a possible degradation pathway of MB solution was proposed.

Degradation of Sarin Simulant DFP by Dielectric Barrier Discharge Plasma

2013 ◽  
Vol 781-784 ◽  
pp. 55-58 ◽  
Author(s):  
Hong Jie Zhao ◽  
Zhen Hu ◽  
Zhan Guo Li
Keyword(s):  
Gas Flow ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Degradation Efficiency ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Initial Concentration ◽  
Barrier Discharge Plasma ◽  
Carrier Gas Flow ◽  
Gas Flow Velocity

The Dielectric Barrier Discharge plasma (DBD) plasma was used to treat Diisopropyl fluorophosphate (DFP, a stimulant of sarin) in the air. The influence factors of degradation efficiency, including power, carrier gas flow velocity and initial concentration of DFP were investigated. As a result, the degradation efficiency increased with the power increasing. The degradation efficiency increased fastly when the power less than 105W, but slowly when the power more than 105W. The degradation efficiency decreased obviously with the carrier gas flow velocity increasing, because the time of DFP stayed in plasma reactor decreased and the concentration of DFP increased. The degradation efficiency rose firstly and then fell with the initial DFP increasing, when the initial concentration was less than 80 mg/m3, but decreased with the the initial concentration increasing, when the initial concentration was more than 80 mg/m3. The main products were acetone, isopropanol, phosphoric acid, pyrophosphoric acid, carbon dioxide and water, analyzed by GC-MS. Reaction mechanism was discussed according to degradation products.

The effects of gas flow pattern on the generation of ozone in surface dielectric barrier discharge

2019 ◽  
Vol 21 (5) ◽  
pp. 055505 ◽  
Author(s):  
Songru XIE ◽  
Yong HE ◽  
Dingkun YUAN ◽  
Zhihua WANG ◽  
Sunel KUMAR ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Dielectric Barrier ◽  
Surface Dielectric Barrier Discharge

Self-Organization of Microgap Dielectric-Barrier Discharge in Gas Flow

2008 ◽  
Author(s):  
Koichi Takaki ◽  
Kota Nawa ◽  
Seiji Mukaigawa ◽  
Tamiya Fujiwara ◽  
Takeshi Aizawa
Keyword(s):  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Self Organization ◽  
Dielectric Barrier

scholarly journals Ar plasma jet generation and its application for water and surface sterilization

2019 ◽  
Vol 78 ◽  
pp. 02020
Author(s):  
Fada Feng ◽  
Xianjun He ◽  
Yingying Liang ◽  
Fengzhu Yang ◽  
Fushan Wang ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Gas Flow ◽  
Barrier Discharge ◽  
Infrared Image ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Living Environment ◽  
Dielectric Barrier ◽  
Surface Sterilization ◽  
Ar Plasma

Microorganisms are widely distributed in the living environment of human, animals and plants. Some of the microorganisms are harmful for their pathogenic effects. Non-thermal plasma technology, especially, the atmospheric pressure plasma jet, is considered to be one of the promising technologies for sterilization. This work proposes a double-dielectric barrier discharge reactor for Ar plasma jet generation. Charteristics of discharge and temperature thermogram of plasma jet are investigated by the means of U-P curve and infrared image, respectively. Performance of the plasma jet is evaluated by surface and water sterilization. The results show that, Ar plasma jet is generated stable with double-dielectric barrier discharge. The length of plasma jet increases as the applied voltage, frequency or gas flow increased, but the plasma jet generation can be restricted in high frequency or gas flow. For E. coli in the water and surface, high sterilization efficiency is observed for a short time treatment by Ar plasma jet.

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