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RISS 인기검색어
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- 저자 : Shufa Zhu (검색결과 2 건)
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Shufa Zhu,Ming Zhou,Shuangyan Zhang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
The objective of this research was to investigate the effects of ammonia continuous circulation enhanced electrokinetic remediation of fluorine contaminated soil and to analyze its influence on soil pH after remediation. An experimental study was carried out in self-made electrokinetic apparatus. The voltage gradient was set at 1.0V/cm and ammonia water with different concentrations was used as electrolyte which circulated in series. Comparative studies were made by using deionized water as electrolyte which circulated separately in one experiment and continuously in another. According to the experiment the continuous circulation of ammonia water increased the current value during the remediation process and maintained current through the soil cell stabler, which not only increased fluorine migration but also reduced energy consumption. Among the given ammonia concentrations (0, 0.01, 0.1 and 0.2mol/L) the removal rate increased with ammonia concentration. 0.2mol/L had the highest current (26.8mA), and the removal rate amounted up to 57.3%. By using ammonia circulation enhanced electrokinetic technology, the difference between pH values of cathode soil and anode soil became smaller. Ammonia continuous circulation enhanced electrokinetics can effectively remediate fluorine contaminated soil and the residual ammonia in the soil can also improve soil fertility.
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Pulse-enhanced electrokinetic remediation of fluorine-contaminated soil
Ming Zhou,Shufa Zhu,Fang Liu,Dongfang Zhou 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
The presence of abundant fluorides in soil can pose potential threats to environment and human health. We investigated the effects of pulsed electric field on electrokinetic remediation of fluorine-contaminated soil by varyingthe pulse interval. Although the remediation time was increased, experimental results indicated pulse-enhanced electroki-netic remediation could improve the removal efficiency of fluorine better than the conventional electrokinetic remedia-tion in the same intensity of electric field. The fluorine removal efficiency of the former (30 min, pulse interval) was80.93% and that of normal electrokinetic remediation was 72.40%, because pulsed electric field could reduce the con-centration polarization and increase the electrical current, electroosmotic flow and the electrical voltage part in soilcell. Therefore, in the later phase of electrokinetic remediation, when electrical current and the fluorine removal efficiencydecreased obviously, at this time the pulse-enhanced method would be a considerable choice to eliminate fluorine incontaminated soils.
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