scholarly journals Degradation of anionic surfactants using the reactor based on dielectric barrier discharge

2016 ◽  
Vol 81 (9) ◽  
pp. 1097-1107 ◽  
Author(s):  
Munera Aonyas ◽  
Biljana Dojcinovic ◽  
Slobodan Dolic ◽  
Bratislav Obradovic ◽  
Dragan Manojlovic ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Sodium Lauryl Sulfate ◽  
Barrier Discharge ◽  
Anionic Surfactants ◽  
Degradation Products ◽  
Oxygen Demand ◽  
Lauryl Sulfate ◽  
Dielectric Barrier ◽  
Surfactant Activity ◽  
Activity Decrease

Two anionic surfactants (sodium lauryl sulfate - SDS and sodium dodecylbenzenesulfonate - SDBS) were treated with dielectric barrier discharge. Loss of surfactant activity, decrease of chemical oxygen demand and total organic carbon as well as lower toxicity of degradation products were determined. Effects of catalysts - hydrogen peroxide and iron (II), on parameters mentioned above, were determined. Catalysts affect the degradation of SDBS and in the case of SDS catalysts have no effect on degradation. Both catalysts induce the decrease of COD and TOC values. Toxicity of solutions after the plasma treatment is lower in all the systems tested.

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

2016 ◽  
Vol 73 (12) ◽  
pp. 2858-2867 ◽  
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.

scholarly journals TREATMENT OF WASTEWATER CONTAINING 2,4-DICHLOROPHENOL IN DIELECTRIC BARRIER DISCHARGE PLASMA

2020 ◽  
Vol 63 (7) ◽  
pp. 88-94
Author(s):  
Grigory I. Gusev ◽  
Andrey A. Gushchin ◽  
Vladimir I. Grinevich ◽  
Tatyana V. Izvekova ◽  
Alexander V. Sharonov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Dielectric Barrier Discharge ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Degradation Products ◽  
Order Kinetic ◽  
Dielectric Barrier Discharge Plasma ◽  
Dielectric Barrier ◽  
Starting Compound ◽  
Barrier Discharge Plasma

In the work, the processes of destruction of aqueous solutions of 2,4-dichlorophenol in a dielectric barrier discharge of atmospheric pressure in oxygen were studied. It has been experimentally shown that 2,4-dichlorophenol is destroyed in plasma quite efficiently (the degree of destruction reaches 80 %), which confirms the earlier studies on the decomposition of various organic pollutants in a dielectric barrier discharge plasma. The kinetic parameters were estimated and the main intermediate and final products of the decomposition of 2,4-dichlorophenol under the action of active plasma particles were determined. The destruction of the starting compound is described by a first order kinetic equation. The effective rate constant depends weakly on the experimental conditions and it equals to 0.56 s–1. The composition of the degradation products was studied by gas chromatography, as well as by fluorescence, spectrophotometric and potentiometric methods. Cl- in the liquid phase, as well as СО and СО2 in the gas phase, were identified as the final degradation products. And carboxylic acids and aldehydes were intermediate degradation products. But their concentrations are not high relative to СО and СО2. No molecular chlorine was detected in the gas phase. It was found that ozone does not make a significant contribution to the oxidative destruction of 2,4-dichlorophenol. The hydroxyl radicals and atomic oxygen are main active particles involved in oxidative processes.  An increase in the frequency of the discharge current from 50 to 800 Hz, as well as the absence of a hydrophobic coating of the internal electrode, leads to a decrease in the decomposition rate by a factor of 1.7 (from 227 to 135 μmol/(l∙s)).

scholarly journals Effects of coaxial dielectric barrier discharge on water treatment at different sites of Kathmandu Valley, Nepal

2018 ◽  
Vol 5 ◽  
pp. 1-6
Author(s):  
Hari Prasad Gyawali ◽  
J. Shrestha ◽  
N. Nakarmi ◽  
R.B. Tyata
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Research Work ◽  
Oxygen Demand ◽  
Total Coliform ◽  
Dielectric Barrier ◽  
Untreated Water ◽  
Before And After ◽  
Wastewater Samples ◽  
Different Sources

The research work reports the results concerning the effects of ozone produced by dielectric barrier discharge (DBD) in well, river and industrial wastewater. The dielectric barrier discharge (DBD) unit was developed to produce highly oxidizing ozone molecules, hydrogen peroxide and hydroxyl radicals for the treatment of water. The discharge was produced by applying AC high voltage (up to 10 kV peak-to-peaks) source of frequency 26 kHz across annular electrodes. The well and wastewater samples were collected from 5 different places of Kathmandu district, Nepal. Various physical, chemical and micro-biological parameters such as pH, Electrical Conductivity (EC), Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Total Coliform were analysed before and after ozonation. Our results showed that pH of water after treatment changed slightly with respect to pH of untreated water. There was slight change in conductivity of water from the different sources after treatment by ozone. DO of all samples increased significantly after ozonation. It was found that BOD and COD of all samples decreased significantly after ozonation. Concentration of ferrous ion (Fe2+) decreased after ozonation. There was significant decrease in Total Coliform after treatment.

scholarly journals Treatment of Wastewater by Ozone Produced in Dielectric Barrier Discharge

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Rita Bhatta ◽  
Rachhya Kayastha ◽  
Deepak P. Subedi ◽  
Rajendra Joshi
Keyword(s):  
Dielectric Barrier Discharge ◽  
Municipal Wastewater ◽  
Barrier Discharge ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Dielectric Barrier ◽  
Rivers And Lakes ◽  
Ph Decrease ◽  
Environmentally Friendly Process ◽  
Ozonation Process

There is rapid diminishing of water resources in many countries due to, for example, population growth and constant reduction in fresh water supply. The sewage wastewater, industrial effluents, and municipal wastewater are directly and indiscriminately discharged into rivers and lakes and thus primarily cause water pollution in Nepal. This has increased the water crisis and also causes environmental deterioration. Therefore, the need for the development of an effective, cheap, and environmentally friendly process for the treatment of wastewater before discharging into aquatic environment has emerged. Treatment by ozone produced from dielectric barrier discharge is one of the emerging technologies for such application. The ozonation process is more effective for disinfection and degradation of organic pollutants from water. The current study describes the treatment of wastewater of selected site within Kathmandu. Results on various physicochemical and microbial parameters of the inlet and outlet samples are discussed. Our results showed slight increase in pH, decrease in chemical oxygen demand, and significant increase in dissolved oxygen after ozonation. Importantly, ozonation caused total reduction of fecal coliform.

Desulfurization of UCG Gas using a Packed-bed Dielectric Barrier Discharge

2015 ◽  
Vol 135 (7) ◽  
pp. 435-436 ◽  
Author(s):  
Kazuhiro Takahashi ◽  
Kohki Satoh ◽  
Hidenori Itoh ◽  
ichi Itakura
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Packed Bed ◽  
Dielectric Barrier

Effects of H2O and O2 on CO Oxidation using Dielectric Barrier Discharge

2013 ◽  
Vol 133 (12) ◽  
pp. 642-647 ◽  
Author(s):  
Hitomi Kawakami ◽  
Akinori Zukeran ◽  
Koji Yasumoto ◽  
Yoshiyasu Ehara ◽  
Toshiaki Yamamoto
Keyword(s):  
Co Oxidation ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Dielectric Barrier
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