Effective degradation of organic water pollutants by atmospheric non-thermal plasma torch and analysis of degradation process

Bansode, Avinash S.; More, Supriya E.; Siddiqui, Ejaz Ahmad; Satpute, Shruti; Ahmad, Absar; Bhoraskar, S. V.; Mathe, V. L.

doi:10.1016/j.chemosphere.2016.09.089

Cited by 70 publications

(19 citation statements)

References 26 publications

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“…Routes of MB degradation and intermediates generated by plasma using different working gases as reported by several studies in literature were compared to our results, as shown in Fig. 7 (lower panels) [61][62][63]. The spectra obtained using oxygen as the working gas produced the greatest number of degradation products.…”

Section: Degradation Mechanismssupporting

confidence: 62%

A Microfluidic Atmospheric-Pressure Plasma Reactor for Water Treatment

Patinglag

Sawtell

Iles

et al. 2019

Plasma Chem Plasma Process

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A dielectric barrier discharge microfluidic plasma reactor, operated at atmospheric pressure, was studied for its potential to treat organic contaminants in water. Microfluidic technology represents a compelling approach for plasma-based water treatment due to inherent characteristics such as a large surface-area-to-volume ratio and flow control, in inexpensive and portable devices. The microfluidic device in this work incorporated a dielectric barrier discharge generated in a continuous gas flow stream of a two-phase annular flow regime in the microchannels of the device. Methylene blue in solution was used to investigate plasma induced degradation of dissolved organic compounds within the microfluidic device. The relative degradation rates of methylene blue were influenced by the residence time of the sample solution in the discharge zone, type of gas applied, channel depth and flow rate. Increasing the residence time inside the plasma region led to higher levels of degradation. Oxygen was found to be the most effective gas, with the spectra obtained using Liquid Chromatography-Mass Spectroscopy indicating the most significant degradation. By reducing the channel depth from 100 to 50 µm, the best results were obtained, achieving a greater than 97% level of methylene blue degradation. The microfluidic system presented here demonstrates proof-of-concept that plasma technology can be utilised as an advanced oxidation process for water treatment, with the potential to eliminate water treatment consumables such as filters and disinfectants.

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Section: Degradation Mechanismssupporting

confidence: 62%

A Microfluidic Atmospheric-Pressure Plasma Reactor for Water Treatment

Patinglag

Sawtell

Iles

et al. 2019

Plasma Chem Plasma Process

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show abstract

“…As shown in Figure 10, the bands at c.a. 3423 cm −1 were assigned to stretching vibrations of OH group included in a hydrogen bond, while 1608 cm −1 , 1383 cm −1 , and 1127 cm −1 corresponded to the C=C, NO 3 − , and C-O group, respectively [10,30]. The existence of NO 3 − in treated solution was attributed to nitric acid and nitrous acid formed from nitrogen in air during the discharge process.…”

Section: Mineralization Of Mbmentioning

confidence: 99%

Degradation of Methylene Blue via Dielectric Barrier Discharge Plasma Treatment

Xie

et al. 2019

Water

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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.agents. As a promising plasma discharge mode, non-thermal plasma (NTP) technique can be utilized to degrade pollutants in wastewater at atmospheric pressure and room temperature with lower input energy than thermal plasma [8]. The typical NTP discharge in, and in contact with, liquids can be divided into three parts, namely, direct discharge in liquids, discharge in gas phase over a liquid, and discharge in multiphase environment such as bubbles or foams inside liquids [7].For discharge in gas phase over a liquid, the gas breakdown occurs in the gap between liquid and high voltage plate. Thus, plasma active species and high energy electrons are generated and then transferred into liquids to react with organic compound [9,10]. The efficiency of NTP reactors is mainly relevant to the efficiency of mass transfer between gas and liquid phases. A packed water jet bed plasma reactor was put forward by Foster et al. [11] to maximize the plasma contact area with the water. The parallel operation of multiple plasma jets or packed bed arrays of water streams are potential solutions to the scale-up problem. Tichonovas et al. [4] and Li et al. [12] proposed a dielectric barrier discharge (DBD) reactor and a gas-liquid plasma reactor, respectively. In their reactors, the gas was sent into the discharge zone, with plasma generated and dispersed into liquid phase by porous ceramic diffusers. This process can increase the efficiency of mass transfer of active species into liquid, resulting in enhanced degradation efficiency. However, the active species diffused into liquid are mostly ozone since the other active radicals dissipate during diffusion process due to their short lifetime [13]. Thus, the mineralization of contaminants in wastewater is difficult to achieve. Therefore, it ...

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“…11 Among NTP processes, dielectric barrier discharge (DBD) plasma has advantages of simple reactor structure and steady discharge state, which has been widely used in dyeing wastewater treatment. [12][13][14] Reddy et al 15 adopted a DBD reactor to investigate the degradation and mineralization of methylene blue (MB) solution. With the addition of Fe 2+ , highest MB degradation (over 95%) and TOC removal (21%) were obtained aer 25 min treatment at 100 mg L À1 MB concentration.…”

Section: Introductionmentioning

confidence: 99%