Removal of cyanide from water by means of plasma discharge technology

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• 作者：Marí ; a Hijosa-Valsero^a ; ^{maria.hijosa@cid.csic.es} ; ^{maria.hijosa@idaea.csic.es} ; Ricardo Molina^b ; ^{ricardo.molina@cid.csic.es} ; Hendrik Schikora^c ; ^{hendrik.schikora@igb.fraunhofer.de} ; Michael M&uuml ; ller^c ; ^{michael.mueller@igb.fraunhofer.de} ; Josep M. Bayona^a ; ^{josep.bayona@cid.csic.es}
• 关键词：Cyanide ; Wastewater ; Plasma ; Dielectric barrier discharge
• 刊名：Water Research
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：47
• 期：4
• 页码：1701-1707
• 全文大小：532 K

文摘

Two different nonthermal plasma reactors at atmospheric pressure were assessed for the first time for cyanide removal (1?mg?L^?1) from aqueous solutions (0.025?M NaHCO₃/NaOH buffer, pH 11) at laboratory scale. Both devices were dielectric barrier discharge (DBD) reactors; one of them was a conventional batch reactor (R1) and the other one was a coaxial thin falling water film reactor (R2). A first-order degradation kinetics was proposed for both experiments, obtaining m>km>_R1?=?0.5553?min^?1 and m>km>_R2?=?0.7482?min^?1. The coaxial reactor R2 yielded a removal of 99 % within only 3?min. Energy efficiencies (m>Gm>) were calculated, yielding 1.74?mg?kW^?1?h^?1 for R1 and 127.9?mg?kW^?1?h^?1 for R2. When the treatment was applied to industrial wastewaters, cyanide elimination was confirmed, although at a lower rate (above 92 % removal in 90?min with R2). Therefore, plasma reactors could be a relevant alternative to established advanced oxidation techniques (UV, H₂O₂, ozonation, etc.) for the removal of cyanide from wastewaters with low organic loads or even drinking waters.