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Process optimization for microcystin-LR degradation by Response Surface Methodology and mechanism analysis in gas-liquid hybrid discharge system.
J Environ Manage. 2016 Dec 01; 183(Pt 3):726-732.JE

Abstract

A gas-liquid hybrid discharge system was applied to microcystin-LR (MC-LR) degradation. MC-LR degradation was completed after 1 min under a pulsed high voltage of 16 kV, gas-liquid interface gap of 10 mm and oxygen flow rate of 160 L/h. The Box-Behnken Design was proposed in Response Surface Methodology to evaluate the influence of pulsed high voltage, electrode distance and oxygen flow rate on MC-LR removal efficiency. Multiple regression analysis, focused on multivariable factors, was employed and a reduced cubic model was developed. The ANOVA analysis shows that the model is significant and the model prediction on MC-LR removal was also validated with experimental data. The optimum conditions for the process are obtained at pulsed voltage of 16 kV, gas-liquid interface gap of 10 mm and oxygen flow rate of 120 L/h with ta removal efficiency of MC-LR of 96.6%. The addition of catalysts (TiO2 or Fe2+) in the gas-liquid hybrid discharge system was found to enhance the removal of MC-LR. The intermediates of MC-LR degradation were analyzed by liquid chromatography/mass spectrometry. The degradation pathway proposed envisaged the oxidation of hydroxyl radicals and ozone, and attack of high-energy electrons on the unsaturated double bonds of Adda and Mdha, with MC-LR finally decomposing into small molecular products.

Authors+Show Affiliations

School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China.School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China.College of Electronic Information, Hangzhou Dianzi University, Hangzhou, 310018, PR China.School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China.School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China.School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China.School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, Zhejiang, PR China. Electronic address: yqcong@hotmail.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27641651

Citation

Zhang, Yi, et al. "Process Optimization for microcystin-LR Degradation By Response Surface Methodology and Mechanism Analysis in Gas-liquid Hybrid Discharge System." Journal of Environmental Management, vol. 183, no. Pt 3, 2016, pp. 726-732.
Zhang Y, Wei H, Xin Q, et al. Process optimization for microcystin-LR degradation by Response Surface Methodology and mechanism analysis in gas-liquid hybrid discharge system. J Environ Manage. 2016;183(Pt 3):726-732.
Zhang, Y., Wei, H., Xin, Q., Wang, M., Wang, Q., Wang, Q., & Cong, Y. (2016). Process optimization for microcystin-LR degradation by Response Surface Methodology and mechanism analysis in gas-liquid hybrid discharge system. Journal of Environmental Management, 183(Pt 3), 726-732. https://doi.org/10.1016/j.jenvman.2016.09.030
Zhang Y, et al. Process Optimization for microcystin-LR Degradation By Response Surface Methodology and Mechanism Analysis in Gas-liquid Hybrid Discharge System. J Environ Manage. 2016 Dec 1;183(Pt 3):726-732. PubMed PMID: 27641651.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Process optimization for microcystin-LR degradation by Response Surface Methodology and mechanism analysis in gas-liquid hybrid discharge system. AU - Zhang,Yi, AU - Wei,Hanyu, AU - Xin,Qing, AU - Wang,Mingang, AU - Wang,Qi, AU - Wang,Qiang, AU - Cong,Yanqing, Y1 - 2016/09/15/ PY - 2016/01/20/received PY - 2016/09/07/revised PY - 2016/09/08/accepted PY - 2016/9/20/pubmed PY - 2017/3/28/medline PY - 2016/9/20/entrez KW - Catalysts addition KW - Degradation pathway KW - Gas–liquid hybrid discharge KW - Microcystin-LR degradation KW - Multivariable optimization SP - 726 EP - 732 JF - Journal of environmental management JO - J Environ Manage VL - 183 IS - Pt 3 N2 - A gas-liquid hybrid discharge system was applied to microcystin-LR (MC-LR) degradation. MC-LR degradation was completed after 1 min under a pulsed high voltage of 16 kV, gas-liquid interface gap of 10 mm and oxygen flow rate of 160 L/h. The Box-Behnken Design was proposed in Response Surface Methodology to evaluate the influence of pulsed high voltage, electrode distance and oxygen flow rate on MC-LR removal efficiency. Multiple regression analysis, focused on multivariable factors, was employed and a reduced cubic model was developed. The ANOVA analysis shows that the model is significant and the model prediction on MC-LR removal was also validated with experimental data. The optimum conditions for the process are obtained at pulsed voltage of 16 kV, gas-liquid interface gap of 10 mm and oxygen flow rate of 120 L/h with ta removal efficiency of MC-LR of 96.6%. The addition of catalysts (TiO2 or Fe2+) in the gas-liquid hybrid discharge system was found to enhance the removal of MC-LR. The intermediates of MC-LR degradation were analyzed by liquid chromatography/mass spectrometry. The degradation pathway proposed envisaged the oxidation of hydroxyl radicals and ozone, and attack of high-energy electrons on the unsaturated double bonds of Adda and Mdha, with MC-LR finally decomposing into small molecular products. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/27641651/Process_optimization_for_microcystin_LR_degradation_by_Response_Surface_Methodology_and_mechanism_analysis_in_gas_liquid_hybrid_discharge_system_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(16)30680-6 DB - PRIME DP - Unbound Medicine ER -