Decontamination of industrial cyanide-containing water in a solar CPC pilot plant

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Solar Energy

DOI:https://doi.org/10.1016/J.SOLENER.2010.03.025· OSTI ID:21328652

Duran, A; Monteagudo, J M; San Martin, I; Aguirre, M ^[1]

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1. Grupo IMAES, Department of Chemical Engineering, Escuela Tecnica Superior de Ingenieros Industriales, University of Castilla-La Mancha, Avda. Camilo Jose Cela 3, 13071 Ciudad Real (Spain)

The aim of this work was to improve the quality of wastewater effluent coming from an Integrated Gasification Combined-Cycle (IGCC) power station to meet with future environmental legislation. This study examined a homogeneous photocatalytic oxidation process using concentrated solar UV energy (UV/Fe(II)/H{sub 2}O{sub 2}) in a Solar Compound Parabolic Collector (CPC) pilot plant. The efficiency of the process was evaluated by analysis of the oxidation of cyanides and Total Organic Carbon (TOC). A factorial experimental design allowed the determination of the influences of operating variables (initial concentration of H{sub 2}O{sub 2}, oxalic acid and Fe(II) and pH) on the degradation kinetics. Temperature and UV-A solar power were also included in the Neural Network fittings. The pH was maintained at a value >9.5 during cyanide oxidation to avoid the formation of gaseous HCN and later lowered to enhance mineralization. Under the optimum conditions ([H{sub 2}O{sub 2}] = 2000 ppm, [Fe(II)] = 8 ppm, pH = 3.3 after cyanide oxidation, and [(COOH){sub 2}] = 60 ppm), it was possible to degrade 100% of the cyanides and up to 92% of Total Organic Carbon. (author)

• OSTI ID: 21328652
• Journal Information: Solar Energy, Vol. 84, Issue 7; Other Information: Elsevier Ltd. All rights reserved; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
14 SOLAR ENERGY
HYDROGEN PEROXIDE
WASTE WATER
OXIDATION
PILOT PLANTS
IRON
ULTRAVIOLET RADIATION
CYANIDES
OXALIC ACID
PARABOLIC COLLECTORS
CARBON
DECONTAMINATION
HYDROCYANIC ACID
PH VALUE
PHOTOCATALYSIS
COMBINED-CYCLE POWER PLANTS
GASIFICATION
MINERALIZATION
NEURAL NETWORKS
EFFICIENCY
CHEMICAL REACTION KINETICS
PARAMETRIC ANALYSIS