title: Treatment of an industrial stream containing vinylcyclohexene by the H2O2/UV process.
abstract: Petrochemical industries generate wastewaters containing pollutants that can severely impact the biological treatment systems. Some streams from specific production units may contain nonbiodegradable or toxic compounds that impair the performance of the wastewater treatment plant and should be segregated and treated by specific techniques. In this work, the utilization of chemical oxidation (H2O2/UV) was investigated for removing 4-vinylcyclohexene (VCH) from a liquid stream coming from the production of hydroxylated liquid polybutadiene (HLPB). Besides VCH, this stream also contains ethanol, hydrogen peroxide, and many other organic compounds. Experiments were carried out in a small-scale photochemical reactor (0.7 L) using a 25-W low-pressure mercury vapor lamp. The photochemical reactor was operated in batch, and the reaction times were comprised between 10 and 60 min. Assays were also performed with a synthetic medium containing VCH, H2O2, and ethanol to investigate the removal of these substances in a less complex aqueous matrix. By-products formed in the reaction were identified by gas chromatography and mass spectroscopy (GC-MS). VCH was significantly removed by the oxidation process, in most assays to undetectable levels. Ethanol removal varied from 16 to 23 % depending on the reaction conditions. Acetic acid, acetaldehyde, and diols were detected as by-products of the industrial wastewater stream oxidation. A drop on the toxicity of the industrial stream was also observed in assays using the organism Artemia salina.
authors.affiliation: COPPE - Chemical Engineering Program, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, 21941-972, Brazil.
authors.forename: Lenise V F
authors.initials: LV
authors.lastname: Gonçalves
authors.affiliation: Department of Chemistry and Molecular Physics, Institute of Chemistry of Sao Carlos, University of Sao Paulo, P.O. Box 780, Sao Carlos, 13560-970, Brazil.
authors.forename: Eduardo B
authors.initials: EB
authors.lastname: Azevedo
authors.affiliation: Department of Organic Chemistry, LADETEC, Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, 21945-970, Brazil.
authors.forename: Francisco R
authors.initials: FR
authors.lastname: de Aquino-Neto
authors.affiliation: Department of Sanitary and Environmental Engineering, Faculty of Engineering, State University of Rio de Janeiro, Rio de Janeiro, 20550-900, Brazil.
authors.forename: Daniele M
authors.initials: DM
authors.lastname: Bila
authors.affiliation: COPPE - Chemical Engineering Program, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, 21941-972, Brazil.
authors.forename: Geraldo L
authors.initials: GL
authors.lastname: Sant'Anna
authors.affiliation: COPPE - Chemical Engineering Program, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, 21941-972, Brazil. mdezotti@peq.coppe.ufrj.br.
authors.forename: Márcia
authors.identifier: http://orcid.org/0000-0002-4592-3306
authors.initials: M
authors.lastname: Dezotti
mesh_terms: D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D000066388:Oil and Gas Industry; D010084:Oxidation-Reduction; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D006861:Hydrogen Peroxide; D007220:Industrial Waste; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Advanced oxidation process; Petrochemical wastewater; UV/peroxidation; Vinylcyclohexene