Hybrid electric discharge plasma technologies for water decontamination: a short review

Abstract

Electric discharge plasma (EDP) can efficiently degrade aqueous pollutants by its in situ generated strong oxidative species (•OH, •O, H 2 O 2 , O 3 , etc) and other physiochemical effects (UV irradiation, shockwaves, local high temperature, etc), but a high energy consumptions limit the application of EDP in water treatment. Some adsorbents, catalysts, and oxidants have been employed for enhancing the degradation of pollutants by discharge plasma. These hybrid plasma technologies offer improved water treatment performance compared to discharge plasma alone. This paper reviews the water decontamination performance and mechanisms of these hybrid plasma technologies, and some suggestions on future water treatment technologies based on discharge plasma are also proposed.

Review on discharge Plasma for water treatment: mechanism, reactor geometries, active species and combined processes

“…Nevertheless, the degradation mechanism is not unique; indeed, it improves the biodegradability of the organic pollutants [139]. This technique can be used alone or coupled with another process such as: photocatalysis [56,57], biodegradation [29], catalytic effects of activated carbon fibers [108], adsorbents, catalysts, ultrasound, ozone and other oxidants [140].…”

Degradation of sulfamethoxazole (SMX) by water falling film DBD Plasma/Persulfate: Reactive species identification and their role in SMX degradation

“…In recent years, discharge plasma technologies have obtained extensive attentions on treating various pollutants [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Electric discharge in water or over water surface produces many kinds of physiochemical effects such as UV irradiation, shockwave, local high temperature, radical and excited state species [19][20][21][22]. The reactive species are mainly responsible for the degradation of pollutants, and hydroxyl radical (⋅OH) is regarded as the dominant radical species in plasma oxidation reactions due to its high redox potential (about 2.7 V at acidic pH) [4].…”

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

“…When emphasizing atmospheric-pressure plasma, a dielectric barrier discharge (DBD) plasma is one of the many types of plasma that is easily generated and utilized. It can be produced by supplying the power from an AC or a pulsed high voltage with a frequency of 500 Hz to 500 kHz to two electrodes separated by a dielectric material which assists in preventing sparks and arcs causing local high temperature 24 , 25 . The reactive species occur in the electrode gap of typically 0.1–10 mm 26 .…”