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Electrokinetic delivery of anodic in situ generated active chlorine to remediate diesel-contaminated sand
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作者:Song, Y (Song, Yue); Cang, L (Cang, Long); Fang, GD (Fang, Guodong) ; Ata-Ul-Karim, ST (Ata-Ul-Karim, Syed Tahir); Xu, HT (Xu, Hongting) ; Zhou, DM (Zhou, Dongmei) 

 

题目:Electrokinetic delivery of anodic in situ generated active chlorine to remediate diesel-contaminated sand

 

刊物:CHEMICAL ENGINEERING JOURNAL,卷: 337  页: 499-505

DOI: 10.1016/j.cej.2017.12.122

出版年: APR 1 2018

 

文章下载:https://ac.els-cdn.com/S1385894717322453/1-s2.0-S1385894717322453-main.pdf?_tid=263fa3e2-8c5d-436e-9cf3-bce26ccaf54b&acdnat=1522809292_42e829731e61b6c4f57088b42ec4f0b2

 

摘要: 

Electrokinetic in situ chemical oxidation (EK-ISCO) is an innovative and effective method for removing petroleum contaminants from soil. However, the high cost of exogenous oxidants is one of the main drawbacks of this technology. In this research, a new approach for the electrokinetic (EK) delivery anodic in situ generation of an oxidant was designed with the aim of solving this problem. Six EK experiments lasting 15 d with different electrolytes (NaCl or NaNO3) and different voltage potentials were performed in order to evaluate the feasibility of this approach. It was found that active chlorine was produced by a dimensionally stable anode and a NaCl solution, and can contribute to remediate sand spiked with diesel fuel (10 g/kg) during EK-ISCO. The obtained results showed that an increase in NaCl electrolyte concentration (from 10 to 40 g/L) increases the maximum concentration of active chlorine in the aqueous sand matrix (from 12.5 to 30 mmol/L). The diesel removal efficiencies were increased from 33% to 44% for 1 V/cm and from 43% to 67% for 2 V/cm, respectively, by using 20 g/L NaCl compared to using 20 g/L NaNO3. Vial tests also confirmed that the anodic in situ generated active chlorine in the electrolyte solution had the effect of oxidizing alkanes of diesel. The products had a higher solubility due to the inclusion of polar functional groups. Under optimal conditions, the energy consumption for removing 1% of contaminants was approximately 2 k Wh/ton. Consequently, the EK delivery of anodic in situ generated active chlorine can be considered as a new cost-effective method for removing organic contaminants from porous media.

 

 

 

 

 


 

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