Transformation characteristics of refractory pollutants in plugboard wastewater by an optimal electrocoagulation and electro-Fenton process

Chemosphere
Xu ZhaoJiuhui Qu

Abstract

The treatment of the plugboard wastewater was performed by an optimal electrocoagulation and electro-Fenton. The organic components with suspended fractions accounting for 30% COD were preferably removed via electrocoagulation at initial 5 min. In contrast, the removal efficiency was increased to 76% with the addition of H(2)O(2). The electrogenerated Fe(2+) reacts with H(2)O(2) and leads to the generation of (·)OH, which is responsible for the higher COD removal. However, overdosage H(2)O(2) will consume (·)OH generated in the electro-Fenton process and lead to the low COD removal. The COD removal efficiency decreased with the increased pH. The concentration of Fe(2+) ions was dependent on the solution pH, H(2)O(2) dosage and current density. The changes of organic characteristics in coagulation and oxidation process were differenced and evaluated using gel permeation chromatography, fluorescence excitation-emission scans and Fourier transform infrared spectroscopy. The fraction of the wastewater with aromatic structure and large molecular weight was decomposed into aliphatic structure and small molecular weight fraction in the electro-Fenton process.

References

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Citations

Nov 7, 2012·Environmental Science and Pollution Research International·Xiangqun FanJinlong Zhang
Dec 9, 2014·Environmental Science and Pollution Research International·Léa GuitayaJean François Blais
Jul 31, 2013·Journal of Environmental Management·V Khandegar, Anil K Saroha
Sep 30, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Mohd Azhar Abd HamidSheikh Abdul Rezan

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