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.

Simultaneous exposure to vinylcyclohexene and methylmercury in Drosophila melanogaster: biochemical and molecular analyses

“…VCH is used commercially as an epoxy resin diluent used in the production of plastic, rubber, and pesticides [4]. Of particular environmental and toxicological concerns, VCH is found at high concentrations in wastewater derived from the production of hydroxylated liquid polybutadiene [5]. VCH exposure may occur through inhalation, ingestion, or dermal contact [6, 7].…”

Facile Strategy for Electrochemical Analysis of Hydrogen Peroxide Based on Multifunctional Fe3O4@Ag Nanocomposites

“…Hydrogen peroxide (H 2 O 2 ) is a widely used chemical constituent in certain industrial processes. 1 It also belongs to a reactive oxygen species, which is distributed in many biological tissues and plays important roles in various biological processes including signaling, tissue damage aging, and carcinogenesis. 2−4 An unusual level of H 2 O 2 may result in different diseases such as neurodegeneration, diabetes, tumor, and cardiovascular diseases.…”

“…Hydrogen peroxide (H 2 O 2 ) is a widely used chemical constituent in certain industrial processes . It also belongs to a reactive oxygen species, which is distributed in many biological tissues and plays important roles in various biological processes including signaling, tissue damage aging, and carcinogenesis. − An unusual level of H 2 O 2 may result in different diseases such as neurodegeneration, diabetes, tumor, and cardiovascular diseases. − Sensitive detection of H 2 O 2 as a molecular alarm is highly desired to monitor the oxidative stress state and to understand related biological mechanisms. , In addition, H 2 O 2 may also be used for the therapy of certain diseases.…”