Oxidation energy efficiency in water treatment with gas-phase pulsed corona discharge as a function of spray density

2020 ◽  
Vol 106 ◽  
pp. 103466 ◽  
Author(s):  
P. Tikker ◽  
I. Kornev ◽  
S. Preis
Keyword(s):  
Energy Efficiency ◽  
Water Treatment ◽  
Corona Discharge ◽  
Gas Phase ◽  
Pulsed Corona Discharge ◽  
Pulsed Corona ◽  
Spray Density

scholarly journals Oxidation of Aqueous Toluene by Gas-Phase Pulsed Corona Discharge in Air-Water Mixtures Followed by Photocatalytic Exhaust Air Cleaning

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 549
Author(s):  
Maarja Kask ◽  
Marina Krichevskaya ◽  
Sergei Preis ◽  
Juri Bolobajev
Keyword(s):  
Corona Discharge ◽  
Gas Phase ◽  
Contact Time ◽  
Closed Loop ◽  
Simultaneous Treatment ◽  
Pulsed Corona Discharge ◽  
Air Cleaning ◽  
Pulsed Corona ◽  
Volatile Organic ◽  
Gaseous Toluene

The treatment of wastewaters containing hazardous volatile organic compounds (VOCs) requires the simultaneous treatment of both water and air. Refractory toluene, extensively studied for its removal, provides a basis for the comparison of its abatement methods. The oxidation of aqueous toluene by gas-phase pulsed corona discharge (PCD) in combination with the subsequent photocatalytic treatment of exhaust air was studied. The PCD treatment showed unequalled energy efficiencies in aqueous and gaseous toluene oxidation, reaching, respectively, up to 10.5 and 29.6 g·kW−1·h−1. The PCD exhaust air contained toluene residues and ozone in concentrations not exceeding 0.1 and 0.6 mg·L−1, respectively. As a result of the subsequent photocatalytic treatment, both airborne residues were eliminated within a contact time with TiO2 as short as 12 s. The results contribute to the possible application of the studied approach in closed-loop energy-saving ventilation systems.

Pulsed corona discharge for degradation of aqueous humic substances

2011 ◽  
Vol 11 (2) ◽  
pp. 238-245 ◽  
Author(s):  
Iris Panorel ◽  
Iakov Kornev ◽  
Henry Hatakka ◽  
Sergei Preis
Keyword(s):  
Energy Efficiency ◽  
Corona Discharge ◽  
Humic Substances ◽  
Pulse Generator ◽  
Pulse Repetition Frequency ◽  
Water Flow Rate ◽  
Oh Radicals ◽  
Pulsed Corona Discharge ◽  
Pulsed Corona ◽  
Voltage Pulse Generator

The research into oxidation of aqueous humic substances (HS) with pulsed corona discharge (PCD) was undertaken to estimate the energy efficiency of the treatment. The PCD system consists of a voltage pulse generator and reactor, in which the gas-phase discharge generating OH radicals and ozone treats the water showered between electrodes. The influence of HS initial concentration, pulse repetition frequency, water flow rate, and the atmosphere composition was evaluated by the decrease in total organic carbon (TOC) and color. The PCD treatment reduced TOC by 40 to 50% and the color by up to 97%. The PCD energy efficiency ranged about 20 g kW−1 h−1 in air and 30 g kW−1 h−1 in oxygen for the lowest initial color of about 50 Pt-Co degrees. Ozone contributed about 30% to the color reduction and only 15% to the reduction in TOC, indicating predominant role of OH radicals in mineralization of oxidation by-products.

scholarly journals Abatement of amoxicillin and doxycycline in binary and ternary aqueous solutions by gas-phase pulsed corona discharge oxidation

2018 ◽  
Vol 334 ◽  
pp. 673-681 ◽  
Author(s):  
Alexander Sokolov ◽  
Matilda Kråkström ◽  
Patrik Eklund ◽  
Leif Kronberg ◽  
Marjatta Louhi-Kultanen
Keyword(s):  
Aqueous Solutions ◽  
Corona Discharge ◽  
Gas Phase ◽  
Pulsed Corona Discharge ◽  
Pulsed Corona

scholarly journals Non-thermal gas-phase pulsed corona discharge for lignin modification

2018 ◽  
Vol 126 ◽  
pp. 141-149 ◽  
Author(s):  
Alexander Sokolov ◽  
Lucas Lagerquist ◽  
Patrik Eklund ◽  
Marjatta Louhi-Kultanen
Keyword(s):  
Corona Discharge ◽  
Gas Phase ◽  
Pulsed Corona Discharge ◽  
Lignin Modification ◽  
Pulsed Corona

Pulsed corona discharge: the role of ozone and hydroxyl radical in aqueous pollutants oxidation

2013 ◽  
Vol 68 (7) ◽  
pp. 1536-1542 ◽  
Author(s):  
S. Preis ◽  
I. C. Panorel ◽  
I. Kornev ◽  
H. Hatakka ◽  
J. Kallas
Keyword(s):  
Hydroxyl Radical ◽  
Corona Discharge ◽  
Gas Phase ◽  
Fast Reaction ◽  
Water Contact ◽  
Pulsed Corona Discharge ◽  
Pulsed Corona ◽  
A Current ◽  
Oxidation Reaction Rate

Ozone and hydroxyl radical are the most active oxidizing species in water treated with gas-phase pulsed corona discharge (PCD). The ratio of the species dependent on the gas phase composition and treated water contact surface was the objective for the experimental research undertaken for aqueous phenol (fast reaction) and oxalic acid (slow reaction) solutions. The experiments were carried out in the reactor, where aqueous solutions showered between electrodes were treated with 100-ns pulses of 20 kV voltage and 400 A current amplitude. The role of ozone increased with increasing oxygen concentration and the oxidation reaction rate. The PCD treatment showed energy efficiency surpassing that of conventional ozonation.

scholarly journals Электроотрицательные добавки как способ повышения эффективности использования тока разряда при конверсии летучих органических соединений

2020 ◽  
Vol 46 (3) ◽  
pp. 10
Author(s):  
Д.Л. Кузнецов ◽  
И.Е. Филатов ◽  
В.В. Уварин
Keyword(s):  
Energy Efficiency ◽  
Carbon Tetrachloride ◽  
Corona Discharge ◽  
Discharge Current ◽  
Pulsed Corona Discharge ◽  
Nanosecond Duration ◽  
Pulsed Corona

The effect of electronegative additives on the conversion of toxic impurities in plasma of air mixtures was studied. Using the example of the conversion of trichloroethylene C2HCl3 in air under the influence of pulsed corona discharge of nanosecond duration, it was shown that the addition of carbon tetrachloride CCl4 to the mixture leads not only to a decrease in the discharge current, but also to an increase in energy efficiency of the conversion of C2HCl3. The analysis of processes in various areas of the corona discharge is carried out.

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