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| Analysis of Factors Influencing Hydroxyl Radical Formation in Electro-Fenton Slurry Reactor |
| Received:August 25, 2014 |
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| KeyWord:Electro-Fenton slurry reactor;hydroxyl radical;influencing factor;salicylic acid;2,5-Dihydroxybenzoic acid |
| Author Name | Affiliation | E-mail | | GAN Xin-hong | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | GUO Shu-hai | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | shuhaiguo@iae.ac.cn | | XU Wen-di | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Gang | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | LI Feng-mei | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | |
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| Abstract: |
| Slurrying has been proven to be an effective and efficient pretreatment method for remediating organic contaminated soils. Combined slurrying and Electro-Fenton treatment procedures may be used to remediate these soils via oxidation. This study investigated key factors influencing ·OH generation and detection accuracy in Electro-Fenton based slurry bioreactor. Salicylic acid was adopted as ·OH trapping reagent. The rate of ·OH generation was increased and maintained at a high level when electrolyte (anhydrous sodium sulfate) was maintained at 5 g·L-1. Higher concentrations of ·OH was found in the samples with initial pH at 3 than at 5 and 11. Also, the highest amount of ·OH was obtained at 5 cm of electrode spacing. The instantaneous generation rate of ·OH could be calculated accurately when the concentration of salicylic acid was kept at 400 μmoI·L-1. Remediation experiments on pyrene-contaminated soil showed that adding certain amount of organic matter could reduce ·OH quenching. The results indicate that Electro-Fenton process could produce large amounts of ·OH under appropriately controlled environment, and thereby degrade organic pollutants rapidly |
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