Stability and performance enhancements of Electrokinetic-Fenton soil remediation

Abstract

Electrokinetic process is a potential in situ soil remediation process which transports the contaminants via electromigration and electroosmosis. For organic compounds contaminated soil, Fenton's reagent is utilized as a flushing agent in electrokinetic process (Electrokinetic-Fenton) so that removal of organic contaminants could be achieved by in situ oxidation/destruction. However, this process is not applied widely in industries as the stability issue for Fenton's reagent is the main drawback. The aim of this mini review is to summarize the developments of Electrokinetic-Fenton process on enhancing the stability of Fenton's reagent and process efficiency in past decades. Generally, the enhancements are conducted via four paths: (1) chemical stabilization to delay H 2 O 2 decomposition, (2) increase of oxidant availability by monitoring injection method for Fenton's reagent, (3) electrodes operation and iron catalysts and (4) operating conditions such as voltage gradient, electrolytes and H 2 O 2 concentration. In addition, the types of soils and contaminants are also showing significant effect as the soil with low acid buffering capacity, adequate iron concentration, low organic matter content and low aromatic ring organic contaminants generally gives better efficiency. Keywords Electrokinetic-Fenton Á H 2 O 2 stability enhancement Á Chemical stabilization Á Oxidant delivery Á Electrodes operation and iron catalysts

Decontamination of Petroleum-Contaminated Soils Using The Electrochemical Technique: Remediation Degree and Energy Consumption

“…Spilling substances, such as petroleum hydrocarbons, on the ground changes the chemical properties of the soil with regard to the amount of organic carbon, which increases (75% of the carbon in oil is oxidable); the pH decreases because of the increase in the quantity of organic carbon and organic acids, while the interchangeable Fe and Mg contents increase, as does the availability of phosphorus 7 .…”

Enhanced electro kinetic- pseudo-Fenton degradation of pyrene-contaminated soil using Fe3O4 magnetic nanoparticles: A data set

“…Nitrogen as a carrier gas was used to make-up flow at a constant pressure of 25 ml min −1 . The oven temperature was held at 100 °C for 3 min and then increased at 15 °C per minute to a final temperature of 280 °C [22], [23], [24].…”

Critical Review of Electro-kinetic Remediation of Contaminated Soils and Sediments: Mechanisms, Performances and Technologies

“…Advanced oxidation processes can promote the degradation of organic pollutants, thereby increasing their removal efficiency. Electro-kinetic Fenton is an electro-kinetic process that utilizes Fenton's reagent as a flushing solution (Fernández de Dios et al, 2014;Ng et al, 2014). The Fenton process produces hydroxyl radicals (•OH) by the reaction of hydrogen peroxide and ferrous ions (Fe 2+ + H 2 O 2 → Fe 3+ + •OH + OH − ), and •OH is a strong oxidant for most organic contaminants (Ni et al, 2018).…”