Post-treatment of bio-treated acrylonitrile wastewater using UV/Fenton process: degradation kinetics of target compounds
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RESEARCH ARTICLE
Post-treatment of bio-treated acrylonitrile wastewater using UV/Fenton process: degradation kinetics of target compounds Xiang Tu 1 & Yang Pan 2 & Hongjie Gao 1 & Bin Li 1 & Yonghui Song 1 Received: 29 November 2018 / Accepted: 3 June 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract In this study, post-treatment of bio-treated acrylonitrile wastewater was performed using the UV/Fenton process. Five target compounds (furmaronitrile, 3-pyridinecarbonitrile, 1,3-dicyanobenzene, 5-methyl-1H-benzotriazole, and 7-azaindole) were selected as target compounds and their degradation kinetics were examined. Under optimal reaction conditions (H2O2 dosage 3.0 mM, Fe2+ dosage 0.3 mM, and initial pH 3.0), more than 85% of total organic carbon (TOC) was eliminated in 30 min when a 10W UV lamp was employed, and the electrical energy per order of magnitude for TOC removal was as low as 2.96 kWh m−3. Furthermore, the target compounds and the toxicity were largely removed from the bio-treated effluent. Size exclusion chromatography with organic carbon detector analysis revealed that organic components with a wide range of molecular weights were greatly reduced after the UV/Fenton process. A simplified pseudo steady-state (SPSS) model was applied to predict the degradation of target compounds during the UV/Fenton process. The concentrations of generated hydroxyl radicals were estimated to be 3.06 × 10−12 M, 6.37 × 10−12 M, and 10.9 × 10−12 M under 5-, 10-, and 15-W UV lamps, respectively. These results demonstrate that the proposed SPSS model fitted well with experimental data on the post-treatment of real wastewater, and consequently indicate that this model can be a useful tool in the prediction of degradation of target compounds during the UV/ Fenton process. Keywords Bio-treated acrylonitrile wastewater . UV/Fenton process . Target compounds . Simplified pseudo steady-state model . Hydroxyl radical
Introduction Acrylonitrile wastewater is an effluent from petrochemical industries, which contains a cocktail of environmentally toxic and non-biodegradable contaminants. These contaminants need to be treated in order to satisfy both the stringent water Responsible editor: Vítor Pais Vilar Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-019-05663-4) contains supplementary material, which is available to authorized users. * Yonghui Song [email protected] 1
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2
Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China
quality regulations and the demand for water recycling in industrial processes (Dai et al. 2015). Conventional biological technologies such as the activated sludge process and the moving bed bioreactor are usually applied to the practical engineering of acrylonitrile wastewater treatment. Regular bio-tr
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