CuO@Cu/Ag/MWNTs/sponge electrode-enhanced pollutant removal in dielectric barrier discharge (DBD) reactor

AbstractAn ozone production using pulse voltage driven dielectric barrier discharge (DBD) reactor was investigated experimentally to clarify an influence of a duty factor of applied pulse voltage on ozone yield. A square of 10 kV applied voltage was generated using a pulse modulator. Insulated gate bipolar transistor (IGBT) switches were employed to generate the square pulse with 1 kHz in pulse repetition rate. Duty factor of the pulse voltage was controlled in range from 10 to 80% by timing of a gate signal to the IGBT switches. The output voltages of the power supply were applied to a multipoint electrode type DBD reactor in order to operate at low applied voltage. The ozone yield was obtained to be around 100 g/kWh at several thousands ppm ozone production in pure oxygen circumstance at 5 L/min. gas flow. The ozone yield decreased with increasing ozone concentration and was almost independent of the duty factor of square applied voltage under the present experimental condition. Power loss consumed in the pulse modulator was successfully reduced by decreasing duty factor of the output voltage without decrease of the ozone production.

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Dielectric barrier discharge-based investigation and analysis of wastewater treatment and pollutant removal

Water Science & Technology ◽

10.2166/wst.2016.131 ◽

2016 ◽

Vol 73 (12) ◽

pp. 2858-2867 ◽

Cited By ~ 2

Author(s):

N. Ramdani ◽

A. Lousdad ◽

A. Tilmatine ◽

S. Nemmich

Keyword(s):

Wastewater Treatment ◽

Dielectric Barrier Discharge ◽

Barrier Discharge ◽

Treatment Plant ◽

Oxygen Demand ◽

Oxidation Potential ◽

Pollutant Removal ◽

High Rate ◽

Wastewater Treatment Process ◽

Dielectric Barrier

Abstract Current research reveals that the oxidation by ozone is considered as an effective solution and offers irrefutable advantages in wastewater treatment. It is also well known that ozone is used to treat different types of water due to its effectiveness in water purification and for its oxidation potential. This process of ozonation is becoming progressively an alternative technology and is inscribed in a sustainable development perspective in Algeria. In this regards, the present paper investigates the wastewater treatment process by ozone produced by dielectric barrier discharge (DBD) under high potential. Three (DBD) ozone generators of cylindrical form have been used, at a laboratory scale, for treating collected samples from the wastewater treatment plant (WWTP) of the city of Sidi-Bel-Abbes located in the west of Algeria. Our experimental results reveal the efficiency of this type of treatment on the basis of the physicochemical analysis (pH, turbidity, chemical oxygen demand, biological oxygen demand, heavy metals) and microbial analysis downstream of the WWTP, which showed a high rate of elimination of all the parameters.

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Abatement of Toluene by Reverse-Flow Nonthermal Plasma Reactor Coupled with Catalyst

Catalysts ◽

10.3390/catal10050511 ◽

2020 ◽

Vol 10 (5) ◽

pp. 511 ◽

Cited By ~ 3

Author(s):

Wenjun Liang ◽

Huipin Sun ◽

Xiujuan Shi ◽

Yuxue Zhu

Keyword(s):

Dielectric Barrier Discharge ◽

Barrier Discharge ◽

Reverse Flow ◽

Plasma Reactor ◽

Nonthermal Plasma ◽

Toluene Degradation ◽

Dielectric Barrier ◽

Reactor Temperature ◽

Dbd Reactor ◽

By Products

In order to make full use of the heat in nonthermal plasma systems and decrease the generation of by-products, a reverse-flow nonthermal plasma reactor coupled with catalyst was used for the abatement of toluene. In this study, the toluene degradation performance of different reactors was compared under the same conditions. The mechanism of toluene abatement by nonthermal plasma coupled with catalyst was explored, combined with the generation of ozone (O3), NO2, and organic by-products during the reaction process. It was found that a long reverse cycle time of the reactor and a short residence time of toluene decreased the internal reactor temperature, which was not beneficial for the degradation of toluene. Compared with the dielectric barrier discharge (DBD) reactor, toluene degradation efficiency in the double dielectric barrier discharge (DDBD) reactor was improved at the same discharge energy level, but the concentrations of NO2 and O3 in the effluent were relatively high; this was improved after the introduction of a catalyst. In the reverse-flow nonthermal plasma reactor coupled with catalyst, the CO2 selectivity was the highest, while the selectivity and amount of NO2 was the lowest and aromatics, acids, and ketones were the main gaseous organic by-products in the effluent. The reverse-flow DBD-catalyst reactor was successful in decreasing organic by-products, while the types of organic by-products in the DDBD reactor were much more than those in the DBD reactor.

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Reduction of tar from biomass gasification using a dielectric barrier discharge reactor

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1195/1/012004 ◽

2021 ◽

Vol 1195 (1) ◽

pp. 012004

Author(s):

M Lim ◽

Z Alimuddin

Keyword(s):

Dielectric Barrier Discharge ◽

Barrier Discharge ◽

Polyaromatic Hydrocarbons ◽

Plasma Reactor ◽

Biomass Gasification ◽

Condensation Temperature ◽

Dielectric Barrier ◽

Mixing Chamber ◽

Non Thermal Plasma ◽

Dbd Reactor

Abstract A non-thermal plasma reactor was used to investigate its effectiveness in reducing the by-products from biomass gasification. Biomass is used for generating heat and power through gasification, which is a process of converting solid fuel to gaseous fuel at temperatures of 700 to 900 °C by operating a reactor in sub-stoichiometric conditions. This gas mixture can be utilized for liquid fuel synthesis or for fuel cells. However, the by-product of gasification consists of tar, which consists of oxygenates, ringed-aromatics, phenolic compounds, and polyaromatic hydrocarbons (PAH). Depending on the composition, the condensation temperature can be as high as 450 °C, fouling downstream equipment. In this study, a dielectric barrier discharge (DBD) reactor with a coil as the inner electrode was used to reduce toluene, a model tar compound. Toluene was injected into a mixing chamber that was heated to 900 °C, evaporating the toluene, and is entrained by nitrogen into the DBD reactor. High voltage is injected into the DBD reactor to initiate ionization, decomposing the toluene into lighter hydrocarbons. A sampling bottle submerged in an ice bath collects the residual toluene, and the resulting decomposition rate is as high as 70%.

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The removal of styrene using a dielectric barrier discharge (DBD) reactor and the analysis of the by-products and intermediates

Research on Chemical Intermediates ◽

10.1007/s11164-012-0664-0 ◽

2012 ◽

Vol 39 (3) ◽

pp. 1021-1035 ◽

Cited By ~ 12

Author(s):

Hongbo Zhang ◽

Kan Li ◽

Tonghua Sun ◽

Jingping Jia ◽

Xueli Yang ◽

...

Keyword(s):

Dielectric Barrier Discharge ◽

Barrier Discharge ◽

Dielectric Barrier ◽

Dbd Reactor ◽

By Products

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Numerical Optimization Research on the Dielectric Barrier Discharge for NOx Removal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1238 ◽

2011 ◽

Vol 356-360 ◽

pp. 1238-1243

Author(s):

Hai Ping Xiao ◽

Xu Du ◽

Lei Wang

Keyword(s):

Dielectric Barrier Discharge ◽

Numerical Optimization ◽

Barrier Discharge ◽

Breakdown Strength ◽

Optimization Method ◽

Nox Removal ◽

Discharge Time ◽

Dielectric Barrier ◽

Dbd Reactor ◽

Discharge Gap

Numerical optimization research was made for the dielectric barrier discharge (DBD) reactor for NOx removal in order to improve the efficiency of the DBD reactor. In this paper, the optimization method proposed by our studying team was adopted to carry out the numerical optimization research on the discharge gap of the reactor. As a result, the breakdown strength of reactor was 44.8kV/cm at a 2mm discharge gap and the discharge started at 25μs. When the discharge gap increased to 8mm, the breakdown strength was 34.1kV/cm and the discharge time was 33μs. The removal rates under the two conditions varied little due to the similar electron mean energy, then experiment was conducted to validate the accuracy of the simulation. When the discharge gap increased, the gas handing capacity of the reactor got higher.Therefore, proper discharge gap has important influence on removal efficiency of NO during DBD.

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In Plasma Catalytic Oxidation of Toluene Using Monolith CuO Foam as a Catalyst in a Wedged High Voltage Electrode Dielectric Barrier Discharge Reactor: Influence of Reaction Parameters and Byproduct Control

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16050711 ◽

2019 ◽

Vol 16 (5) ◽

pp. 711 ◽

Cited By ~ 6

Author(s):

Juexiu Li ◽

Hongbo Zhang ◽

Diwen Ying ◽

Yalin Wang ◽

Tonghua Sun ◽

...

Keyword(s):

Dielectric Barrier Discharge ◽

Removal Efficiency ◽

High Voltage ◽

Barrier Discharge ◽

Degradation Mechanism ◽

Anthropogenic Sources ◽

Substantial Contribution ◽

High Voltage Electrode ◽

Dielectric Barrier ◽

Dbd Reactor

Volatile organic compounds (VOCs) emission from anthropogenic sources has becoming increasingly serious in recent decades owing to the substantial contribution to haze formation and adverse health impact. To tackle this issue, various physical and chemical techniques are applied to eliminate VOC emissions so as to reduce atmospheric pollution. Among these methods, non-thermal plasma (NTP) is receiving increasing attention for the higher removal efficiency, non-selectivity, and moderate operation, whereas the unwanted producing of NO2 and O3 remains important drawback. In this study, a dielectric barrier discharge (DBD) reactor with wedged high voltage electrode coupled CuO foam in an in plasma catalytic (IPC) system was developed to remove toluene as the target VOC. The monolith CuO foam exhibits advantages of easy installation and controllable of IPC length. The influencing factors of IPC reaction were studied. Results showed stronger and more stable plasma discharge in the presence of CuO foam in DBD reactor. Enhanced performance was observed in IPC reaction for both of toluene conversion rate and CO2 selectivity compared to the sole NTP process at the same input energy. The longer the contributed IPC length, the higher the toluene removal efficiency. The toluene degradation mechanism under IPC condition was speculated. The producing of NO2 and O3 under IPC process were effectively removed using Na2SO3 bubble absorption.

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Degradation of benzodiazepines using water falling film dielectric barrier discharge reactor

Journal of the Serbian Chemical Society ◽

10.2298/jsc170118050r ◽

2017 ◽

Vol 82 (7-8) ◽

pp. 933-942

Author(s):

Vesna Radulovic ◽

Goran Roglic ◽

Dragan Manojlovic

Keyword(s):

Dielectric Barrier Discharge ◽

High Performance ◽

Degradation Rate ◽

Barrier Discharge ◽

Biologically Active ◽

Array Detector ◽

Active Pharmaceutical Ingredients ◽

Dielectric Barrier ◽

Pharmaceutical Ingredients ◽

Dbd Reactor

Classical methods of wastewater treatment are often not suitable for the treatment of pharmaceutical waste. The previous studies have shown that the use of the advanced oxidation procedures (AOP) can lead to a more efficient degradation of various biologically active compounds, which are active pharmaceutical ingredients of applied drugs. The aim of this paper is the application of the plasma technology on the degradation of a two active pharmaceutical ingredients (APIs, diazepam and alprazolam) and the finished products (Bensedin? and Ksalol?) using the dielectric barrier discharge (DBD) reactor for AOP. We studied the degradation rate of these pharmaceuticals, depending on the number of passes through the reactor. This degradation method was efficient 61 % for diazepam and 95 % alprazolam. We also examined the influence of the pH adjustment between the passes of APIs through the DBD reactor. The degradation rate of APIs and the finished products was monitored by the high performance liquid chromatography (HPLC) technique, using a photodiode array detector. The concentration of the dissolved ozone was determined using the iodometric procedure.

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