title: Removal of cyanide from water by means of plasma discharge technology.
abstract: 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 NaHCO(3)/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 k(R1) = 0.5553 min(-1) and k(R2) = 0.7482 min(-1). The coaxial reactor R2 yielded a removal of 99% within only 3 min. Energy efficiencies (G) 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, H(2)O(2), ozonation, etc.) for the removal of cyanide from wastewaters with low organic loads or even drinking waters.
authors: Instituto de Diagnóstico Ambiental y Estudios del Agua (IDAEA), CID, CSIC, C/Jordi Girona 18-26, E-08034 Barcelona, Spain. maria.hijosa@cid.csic.es
authors: María
authors: M
authors: Hijosa-Valsero
authors: Ricardo
authors: R
authors: Molina
authors: Hendrik
authors: H
authors: Schikora
authors: Michael
authors: M
authors: Müller
authors: Josep M
authors: JM
authors: Bayona
mesh_terms: D001274:Atmospheric Pressure; D057919:Biological Oxygen Demand Analysis; D003486:Cyanides / Q000302:isolation & purification*; D004867:Equipment Design; D007700:Kinetics; D012996:Solutions; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D003486:Cyanides; D012996:Solutions; D062065:Wastewater