Discharge characteristics of plasma induced by water drop and its potential for water treatment

Wang, Xiaoping; Zhao, Dengmei; Tan, Xuemei; Chen, Yixia; Chen, Zihan; He, Xiuli

doi:10.1016/j.cej.2017.07.082

Cited by 20 publications

(4 citation statements)

References 28 publications

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“…Other methods than the direct interaction between plasma and water are also used. Examples include the use of water drop plasma for Ibuprofen removal (Wang et al, 2017) or plasmas directly generated in water to produce "plasma bubbles" for E. coli inactivation (Ma et al, 2017b) and degradation process of chitosan (Ma et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Plasma-activation of tap water using DBD for agronomy applications: Identification and quantification of long lifetime chemical species and production/consumption mechanisms

et al. 2018

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Cold atmospheric plasmas are weakly ionized gases that can be generated in ambient air. They produce energetic species (e.g. electrons, metastables) as well as reactive oxygen species, reactive nitrogen species, UV radiations and local electric field. Their interaction with a liquid such as tap water can hence change its chemical composition. The resulting "plasma-activated liquid" can meet many applications, including medicine and agriculture. Consequently, a complete experimental set of analytical techniques dedicated to the characterization of long lifetime chemical species has been implemented to characterize tap water treated using cold atmospheric plasma process and intended to agronomy applications. For that purpose, colorimetry and acid titrations are performed, considering acid-base equilibria, pH and temperature variations induced during plasma activation. 16 species are quantified and monitored: hydroxide and hydronium ions, ammonia and ammonium ions, orthophosphates, carbonate ions, nitrite and nitrate ions and hydrogen peroxide. The related consumption/production mechanisms are discussed. In parallel, a chemical model of electrical conductivity based on Kohlrausch's law has been developed to simulate the electrical conductivity of the plasma-activated tap water (PATW). Comparing its predictions with experimental measurements leads to a narrow fitting, hence supporting the self-sufficiency of the experimental set, I.e. the fact that all long lifetime radicals of interest present in PATW are characterized. Finally, to evaluate the potential of cold atmospheric plasmas for agriculture applications, tap water has been daily plasma-treated to irrigate lentils seeds. Then, seedlings lengths have been measured and compared with untreated tap water, showing an increase as high as 34.0% and 128.4% after 3 days and 6 days of activation respectively. The interaction mechanisms between plasma and tap water are discussed as well as their positive synergy on agronomic results.

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Section: Introductionmentioning

confidence: 99%

Plasma-activation of tap water using DBD for agronomy applications: Identification and quantification of long lifetime chemical species and production/consumption mechanisms

et al. 2018

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“…For ibuprofen with an initial concentration of 60 mg/l, the removal rate was 83% after 60min of treatment using 32 kV pulses with a frequency of 100 Hz. A water surface discharge system was developed in [115] for ibuprofen degradation in 1000ml water solution.…”

Section: Pharmaceutical Compounds Degradationmentioning

confidence: 99%

“…FIGURE 35.The block diagram of water drop induced discharge treatment system for ibuprofen degradation[115].…”

mentioning

confidence: 99%

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

2019

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Water quality improvement and collecting safe water are two of the paramount concerns in today's world. Numerous water treatment and pollutant removal processes are introduced that vary with the type of pollutants. Among the proposed pollutant degradation methods, pulsed power is one of the effective methods that can be applied not only to degrade a wide range of contaminants but also to address the environmental issues associated with water treatment chemicals. The effectiveness of the pulsed power technology in water treatment was studied for a wide range of pollutants including microorganisms, nutrient pollution, emerging pollutants, and organic pollutants. This paper presents a review of pulsed power systems developed for organic and inorganic pollutants degradation in different water treatment applications. Also, it presents the effectiveness of several factors like the electrical characteristics of the pulse voltages and treatment time on degradation rates of different pollutants.

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“…In addition, the process could be carried out indirectly (i.e., plasma discharges generated above the water), directly (i.e., plasma discharges generated in water), and using a hybrid approach. These different techniques imply that there is a need to improve the design of the plasma reactors used in wastewater treatment applications to increase its effectiveness and efficiency [2][3][4][5][6][7][8][9][10][11][12]. An understanding of the physical phenomena describing the plasma dynamics and the calculation of the discharge temperature are vital in order to optimize the design of reactors and consequently the plasma treatment.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Low Current Atmospheric and High-Pressure Helium Plasma Discharges

et al. 2021

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A plasma discharge in a Helium gas reactor at different pressures and at low currents (0.25–0.45 A) has been investigated by Computational Fluid Dynamic modeling coupled with the Maxwell’s equations. The results show different discharge dynamics across the pressure range (0.1–8 MPa), with an arc discharge obtained at high pressure and a low current arc discharge observed at atmospheric pressure. A large density gradient at higher pressure causes a strong natural convection effect in the reactor. This density gradient affects drastically the discharge shape and the velocity field at high pressures while at atmospheric pressure, a lower density gradient was observed resulting in a low velocity magnitude. It has been observed that the velocity magnitude is not affected by the electric current. The discharge electric potential has been calculated by considering the electrical characterization of the electrodes and numerical results have been compared with experimental results. The comparison shows a good agreement between the measured and calculated discharge electric potential at lower pressures. These devices can be used as plasma sources for wastewater treatment.

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Discharge characteristics of plasma induced by water drop and its potential for water treatment

Cited by 20 publications

References 28 publications

Plasma-activation of tap water using DBD for agronomy applications: Identification and quantification of long lifetime chemical species and production/consumption mechanisms

Plasma-activation of tap water using DBD for agronomy applications: Identification and quantification of long lifetime chemical species and production/consumption mechanisms

A Review of Pulsed Power Systems for Degrading Water Pollutants Ranging From Microorganisms to Organic Compounds

Modeling and Simulation of Low Current Atmospheric and High-Pressure Helium Plasma Discharges

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