Removal of several pesticides in a falling water film DBD reactor with activated carbon textile: Energy efficiency

WATER RESEARCH

卷:116

Article

Vanraes, Patrick¹  Ghodbane, Houria^2,3  Davister, Dries⁴  Wardenier, Niels^1,4  Nikiforov, Anton¹  Verheust, Yannick P.⁴  Van Hulle, Stijn W. H.⁴  Hamdaoui, Oualid²  Vandamme, Jeroen⁵  Van Durme, Jim⁵  Surmont, Pieter⁶  Lynen, Frederic⁶  Leys, Christophe¹ 

[1] Univ Ghent, Dept Appl Phys, Sint Pietersnieuwstr 41 B4, B-9000 Ghent, Belgium

[2] Badji Mokhtar Annaba Univ, Dept Proc Engn, Lab Environm Engn, Annaba 23000, Algeria

[3] Univ Souk Ahras, Fac Sci & Technol, Dept Proc Engn, Souk Ahras 41000, Algeria

[4] Univ Ghent, Dept Ind Biol Sci, LIWET, Campus Kortrijk,Graaf Karel de Goedelaan 5, B-8500 Kortrijk, Belgium

[5] Katholieke Univ Leuven, Dept Microbial & Mol Syst M2S, Res Grp Mol Odor Chem, Technology Campus,Gebroeders Smetstr 1, B-9000 Ghent, Belgium

[6] Univ Ghent, Dept Organ & Macromol Chem, Separat Sci Grp, Krijgslaan 281 S4 Bis, B-9000 Ghent, Belgium

关键词: Plasma treatment;    Pesticides;    Energy yield;    Nitrite;    Nitrate;    Peroxone;   

DOI  :  10.1016/j.watres.2017.03.004

来源: Elsevier

【 摘 要 】

Bio-recalcitrant micropollutants are often insufficiently removed by modern wastewater treatment plants to meet the future demands worldwide. Therefore, several advanced oxidation techniques, including cold plasma technology, are being investigated as effective complementary water treatment methods. In order to permit industrial implementation, energy demand of these techniques needs to be minimized. To this end, we have developed an electrical discharge reactor where water treatment by dielectric barrier discharge (DBD) is combined with adsorption on activated carbon textile and additional ozonation. The reactor consists of a DBD plasma chamber, including the adsorptive textile, and an ozonation chamber, where the DBD generated plasma gas is bubbled. In the present paper, this reactor is further characterized and optimized in terms of its energy efficiency for removal of the five pesticides alpha-HCH, pentachlorobenzene, alachlor, diuron and isoproturon, with initial concentrations ranging between 22 and 430 mu g/L. Energy efficiency of the reactor is found to increase significantly when initial micro pollutant concentration is decreased, when duty cycle is decreased and when oxygen is used as feed gas as compared to air and argon. Overall reactor performance is improved as well by making it work in single-pass operation, where water is flowing through the system only once. The results are explained with insights found in literature and practical implications are discussed. For the used operational conditions and settings, a-HCH is the most persistent pesticide in the reactor, with a minimal achieved electrical energy per order of 8 kWh/m3, while a most efficient removal of 3 kWh/m(3) or lower was reached for the four other pesticides. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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