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A pulsed switching peroxi-coagulation process to control hydroxyl radical production and to enhance 2,4-Dichlorophenoxyacetic acid degradation |
Yaobin Lu1, Songli He2, Dantong Wang2, Siyuan Luo2, Aiping Liu3(), Haiping Luo1, Guangli Liu1(), Renduo Zhang1 |
1. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China 2. Zhaoqing Environmental Monitoring Station, Zhaoqing Institute of Environmental Science, Zhaoqing 526040, China 3. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China |
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Abstract • A new pulsed switching peroxi-coagulation (PSPC) system was developed. • The ECT for 2,4-D removal in the PSPC was lower than that in the EF. • The iron consumption for 2,4-D removal in the PSPC was lower than that in the PC. The aim of this study was to develop a new pulsed switching peroxi-coagulation system to control hydroxyl radical (?OH) production and to enhance 2,4-Dichlorophenoxyacetic acid (2,4-D) degradation. The system was constructed with a sacrifice iron anode, a Pt anode, and a gas diffusion cathode. Production of H2O2 and Fe2+ was controlled separately by time delayers with different pulsed switching frequencies. Under current densities of 5.0 mA/cm2 (H2O2) and 0.5 mA/cm2 (Fe2+), the ?OH production was optimized with the pulsed switching frequency of 1.0 s (H2O2):0.3 s (Fe2+) and the ratio of H2O2 to Fe2+ molar concentrations of 6.6. Under the optimal condition, 2,4-D with an initial concentration of 500 mg/L was completely removed in the system within 240 min. The energy consumption for the 2,4-D removal in the system was much lower than that in the electro-Fenton process (68±6 vs. 136±10 kWh/kg TOC). The iron consumption in the system was ~20 times as low as that in the peroxi-coagulation process (196±20 vs. 3940±400 mg/L) within 240 min. The system should be a promising peroxi-coagulation method for organic pollutants removal in wastewater.
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Keywords
Pulsed switching peroxi-coagulation system
Energy consumption
Hydroxyl radical production
2
4- Dichlorophenoxyacetic acid
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Corresponding Author(s):
Aiping Liu
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Issue Date: 18 August 2018
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