Electrokinetic delivery of persulfate to remediate PCBs polluted soils: Effect of different activation methods

Chemosphere
Guang-Ping FanDong-Mei Zhou

Abstract

Persulfate-based in-situ chemical oxidation (ISCO) for the remediation of organic polluted soils has gained much interest in last decade. However, the transportation of persulfate in low-permeability soil is very low, which limits its efficiency in degrading soil pollutants. Additionally, the oxidation-reduction process of persulfate with organic contaminants takes place slowly, while, the reaction will be greatly accelerated by the production of more powerful radicals once it is activated. Electrokinetic remediation (EK) is a good way for transporting persulfate in low-permeability soil. In this study, different activation methods, using zero-valent iron, citric acid chelated Fe(2+), iron electrode, alkaline pH and peroxide, were evaluated to enhance the activity of persulfate delivered by EK. All the activators and the persulfate were added in the anolyte. The results indicated that zero-valent iron, alkaline, and peroxide enhanced the transportation of persulfate at the first stage of EK test, and the longest delivery distance reached sections S4 or S5 (near the cathode) on the 6th day. The addition of activators accelerated decomposition of persulfate, which resulted in the decreasing soil pH. The mass of persulfate deliver...Continue Reading

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Citations

May 22, 2016·Environmental Science and Pollution Research International·V RybnikovaK Hanna
Oct 7, 2016·Environmental Science. Processes & Impacts·Guangping FanDongmei Zhou
Dec 30, 2017·Environmental Technology·Milady Renata Apolinário da SilvaRossano Gimenes
Dec 10, 2020·Environmental Science & Technology·Riccardo SprocatiMassimo Rolle
Jun 17, 2020·Environmental Science & Technology·Jiayi YaoZunyao Wang

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