Inactivation of Microcystis aeruginosa with Contact Glow Discharge Electrolysis

Abstract

This work investigated the inactivation of Microcystis aeruginosa (MA) with contact glow discharge electrolysis (CGDE). The influences of applied voltage, current and treatment time on the inactivation rate were critically examined. Based on the above results, the optimal conditions were chosen to sufficiently utilize chemically active species and enhance the inactivation of MA. Under the optimal conditions (voltage: 530 V; current: 30 mA; treatment time: 20 min), the inactivation rate of algae was more than 90% within 5 days incubation after inoculating. At the same time, the concentrations of Chlorophyll-a and dehydrogenase decreased, which demonstrated that 20 min CGDE treatment could effectively inhibit the growth of MA and caused deterioration of cell integrity. The present work would provide strong evidence to support the utilization of CGDE on the inactivation of MA in aqueous solution.

New insight into the residual inactivation of Microcystis aeruginosa by dielectric barrier discharge

“…Besides the energetic particles including negatively charged electrons and positively charged ions, the accompanying intrinsic UV emission and impact waves, chemically active substances such as hydrogen, oxygen, hydrogen peroxide and active radicals such as hydroxyl radical, hydroperoxyl radical, oxygen radical and hydrogen radical are produced during the plasma discharge 2 25 26 27 28 . These active chemical species can inactivate algal cells as reported by our previous study 2 and other studies 1 12 15 .…”

“…Therefore, there is an urgent need to develop efficient techniques to control and reduce the adverse impact of blooms. To suppress or remove cyanobacteria blooms, various methods have been adopted such as chemical treatment 3 4 5 , UV radiation 6 7 , ultrasound irradiation 8 9 10 , electron beam irradiation 11 and non-thermal plasma oxidation technology 2 12 13 14 15 16 . However, the chemical methods such as excessive use of algaecides can lead to secondary pollution, while the physical methods such as UV radiation, sonication and electron-beam irradiation have the limitation for bloom control with high efficiency or on a large scale.…”

Atmospheric Pressure Glow Discharges Generated in Contact with Flowing Liquid Cathode: Production of Active Species and Application in Wastewater Purification Processes

“…It was reported that this type of plasma sources was applied so far to the purification of water from organic dyes [8][9][10][11], phenol [12][13][14], or organic halides [15][16][17] and to the sterilization of water [1,18] and its bio-decontamination [19][20][21]. The discoloration of wastewaters containing various dyes and the decomposition of other organic compounds by glow discharges (GDs) were rather frequently studied in various plasma reactors and electrode configurations, i.e., discharges in liquids termed as glow discharge electrolysis (GDE) [10,16], discharges in contact with liquids termed as contact glow discharge electrolysis (CGDE) [6,9,12,[20][21][22][23] and discharges between two liquids separated by thin diaphragm holes termed as diaphragm glow discharge (DGD) [11,17]. It was also possible to inactivate glutathione [20], cyanotoxins (microcystin-LR) [21] or cyanobacteria (microcystis aeruginosa) in fresh waters by CGDEs [22].…”

“…The discoloration of wastewaters containing various dyes and the decomposition of other organic compounds by glow discharges (GDs) were rather frequently studied in various plasma reactors and electrode configurations, i.e., discharges in liquids termed as glow discharge electrolysis (GDE) [10,16], discharges in contact with liquids termed as contact glow discharge electrolysis (CGDE) [6,9,12,[20][21][22][23] and discharges between two liquids separated by thin diaphragm holes termed as diaphragm glow discharge (DGD) [11,17]. It was also possible to inactivate glutathione [20], cyanotoxins (microcystin-LR) [21] or cyanobacteria (microcystis aeruginosa) in fresh waters by CGDEs [22]. The removal of inorganic hazardous chemicals from waters by APGDs was faintly examined.…”

Application of flying jet plasma torch in wastewater treatment

“…These highly energetic electrons produce free radicals from parent molecules in multi-step physical and chemical processes, leading to high destructive ability [1][2][3][4][5][6][7] . In terms of treating wastewater, NTP has been utilized in several studies to degrade organic pollutants [8][9][10][11][12][13][14][15] , to inactivate algae [16] and to reduce chromium VI [17][18] . Different categories of glow discharge plasmas were generated in abovementioned studies and utilized for treating wastewater such as direct glow discharge, diaphragm glow discharge and anodic and multi anode contact glow discharge electrolysis.…”