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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2018, Vol. 12 Issue (5) : 9    https://doi.org/10.1007/s11783-018-1070-7
SHORT COMMUNICATION
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.

Keywords Pulsed switching peroxi-coagulation system      Energy consumption      Hydroxyl radical production      2      4- Dichlorophenoxyacetic acid     
Corresponding Author(s): Aiping Liu   
Issue Date: 18 August 2018
 Cite this article:   
Yaobin Lu,Songli He,Dantong Wang, et al. A pulsed switching peroxi-coagulation process to control hydroxyl radical production and to enhance 2,4-Dichlorophenoxyacetic acid degradation[J]. Front. Environ. Sci. Eng., 2018, 12(5): 9.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-018-1070-7
https://academic.hep.com.cn/fese/EN/Y2018/V12/I5/9
Fig.1  (a) ?OH concentrations vs. time (b) the energy consumption per unit ?OH production (ECO) and the ratio of H2O2 to Fe2+ molar concentrations ([H2O2]/[Fe2+]) in the PSPC under different electrolysis time ratios of H2O2 to Fe2+, (c) ?OH concentrations vs. time and (d) ECO in the PSPC under different pulsed switching frequencies
Fig.2  Temporal distributions of (a) the 2,4-D removal (b) the residual TOC and (c) the energy consumption per unit TOC mass (ECT) in the PSPC (Initial conditions: A pulsed switching frequency of 1:0.3 s and the current densities of 5.0 mA/cm2 and 0.5 mA/cm2 for H2O2 and Fe2+ production respectively), the EF process (the current densities of 5.0 mA/cm2 for H2O2 production and 196±20 mg/L Fe2+ addition with the same as that in the PSPC) and the PC process (the same current densities of 5.0 mA/cm2 for H2O2 and Fe2+ production)
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