Abstract
The development of immobilized photocatalyst as a strategy for problematic electronics wastewater reuse is described in this study. The strategy was to perform separate rinsing, mostly consisting of low molecular weight compounds, and to decompose them with a simple process, based on the advanced oxidation process (AOP). Extensive studies were performed on the preparation conditions of immobilized photocatalysts by sol-gel method under various amount of precursor and support, water to precursor ratio, pH, aging time, and calcination conditions. The optimized preparation conditions were chosen by measuring removal efficiencies of isopropyl alcohol as a representative target compound with supportive SEM and XRD analyses. Removal efficiencies with photocatalyst and UV irradiation in synthetic wastewater simulating electronics wastewater were evaluated over time. Removal efficiencies of alcohol, acetone, ethanol, and acetaldehyde reached 97.2%, 71.2%, 99.0%, and 99.0%, respectively, in 2 h. Reaction constants of each compound were determined by fitting experimental data to the first order kinetic equation and the trial and error method with consecutive reaction pathway. As analysis results of reaction constants, UV with prepared photocatalyst was found to be effective and the decomposition of acetone was found to be the rate-determining step. The immobilized photocatalyst developed in this study would be useful for application of wastewater reuse with high removal efficiencies, mild preparation conditions, and mechanical stability.
Highlights
According to a Korean government report, the most water-intensive sectors are textile, pulp, and electronics industries, and the water consumption in those industries has gradually increased over the years [1]
(10 of constituent isopropyl alcohol) to amplify of removal different preparation conditions for selection of preparation conditions. These preliminary tests were conducted in high loading with a single constituent rather than testing with multiple constituents (1 mg/L of each)
The removals mg/Linofvarious isopropyl alcohol) conditions to amplify are sensitivity of removal different preparation ofconditions isopropyl (10 alcohol preparation presented in Figurein conditions with patterns a single constituent rather than testing with multiple constituents (1 mg/L of each)
Summary
According to a Korean government report, the most water-intensive sectors are textile, pulp, and electronics industries, and the water consumption in those industries has gradually increased over the years [1]. The electronics industry has undergone a severe water shortage problem due to its recent rapid growth and limited water supply. The production facilities in electronics industries, such as semiconductors and display manufacturing, use various toxic chemicals, mostly low molecular organic compounds, such as isopropyl alcohol and acetone [2]. These compounds are not completely removed by conventional wastewater treatment processes, such as reverse osmosis and biological treatment. To meet stringent water quality needs in the electronics industry, additional treatments, such as advanced oxidation processes (AOPs), have been considered [3]. AOPs utilize hydroxyl radicals with a greater oxidation potential than chemical oxidants for decomposing low molecular weight
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