Electro-osmotic fluxes in multi-well electro-remediation processes

López-Vizcaíno, Rubén; Sáez, Cristina; Mena, Esperanza; Villaseñor, José; Cañizares, Pablo; Rodrigo, Manuel A.

doi:10.1080/10934529.2011.609458

Cited by 31 publications

(28 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The polarity reversal strategy applied in this study causes reversal in the EOF direction, and it has been reported that it also results in a lower volume of water being transported to the electrode wells [22]. This is an important aspect from a biological perspective because it would improve the distribution of the nutrients and reduce the nutrients removed from the soil, thus allowing better performance of the pollutant's biodegradation process [23,24].…”

Section: Resultsmentioning

confidence: 99%

Electrokinetic remediation of soil polluted with insoluble organics using biological permeable reactive barriers: Effect of periodic polarity reversal and voltage gradient

Mena

Villaseñor

Rodrigo

et al. 2016

Chemical Engineering Journal

Self Cite

120

View full text Add to dashboard Cite

This study investigated the remediation of clay soil polluted with low-solubility organics (diesel hydrocarbons) using a combined electrochemical-biological technology. Electrokinetic soil flushing was used, coupled with a biological permeable reactive barrier, which was placed into soil away from electrodes to prevent the negative effects of the acidic and basic fronts on the viability of microorganisms. Three two-week long batch experiments were performed in a lab-scale installation specifically designed to evaluate the remediation of polluted soil. The primary variable under study was the electric field applied to the soil (0.5, 1.0 and 1.5 V•cm-1), and the experimental procedure included daily polarity reversal of the electrodes and the addition of anionic surfactant in the electrode wells. The polarity reversal was observed to be a key strategy, which allowed adequate experimental conditions to be maintained in the soil (especially temperature and pH) for the success of the organic biodegradation process. The surfactant was evenly distributed across the soil, which helped the pollutant be transported. The biological activity was not limited to the barrier area but extended to the entire soil portion due to the microbial transport and growth far from the central barrier position. The voltage gradient did not have a strong influence on the measured experimental conditions (soil temperature, pH and moisture) but affected the electroosmotic flow. A higher diesel removal efficiency (36%) was observed when using the higher voltage gradient (1.5 V•cm-1) after two weeks, which demonstrates a promising performance of the studied technology for a future real in-situ application.

show abstract

Section: Resultsmentioning

confidence: 99%

Electrokinetic remediation of soil polluted with insoluble organics using biological permeable reactive barriers: Effect of periodic polarity reversal and voltage gradient

Mena

Villaseñor

Rodrigo

et al. 2016

Chemical Engineering Journal

Self Cite

120

View full text Add to dashboard Cite

show abstract

“…One very important parameter in the EKSF processes is the pH, which is also directly related to intensity of the electric current. The pH is known to change in a different fashion (Lopez-Vizcaino et al, 2011) in both the anode and the cathode, as shown in Figure 5. without any EKSF remediation process after this spill.…”

Section: Methodsmentioning

confidence: 99%

Removal of oxyfluorfen from spiked soils using electrokinetic soil flushing with the surrounding arrangements of electrodes

Risco

Rubí-Juárez

Rodrigo

et al. 2016

Science of The Total Environment

View full text Add to dashboard Cite

This work reports the results of a study in which the remediation of soil that undergoes an accidental discharge of oxyfluorfen is carried out by using electrokinetic soil flushing (EKSF). Two different electrode configurations were tested, consisting of several electrodes surrounding an electrode of different polarity (so-called 1A6C, one anode surrounded by six cathodes, and 1C6A, one cathode surrounded by six cathodes). A pilot plant scale was used (with a soil volume of 175dm(3)) to perform the studies. During the tests, different parameters were measured daily (flowrates, pH, electrical conductivity and herbicide concentration in different sampling positions). Furthermore, at the end of the test, a complete post-mortem analysis was carried out to obtain a 3-D map of the pollution, pH and electrical conductivity in the soil. The results demonstrate that electrode arrangement is a key factor for effective pollutant removal. In fact, the 1A6C configuration improves the removal rate by 41.3% versus the 27.0% obtained by the 1C6A configuration after a period of 35days. Finally, a bench mark comparison of this study of soil remediation polluted with 2,4-D allows for significant conclusions about the scale-up and full-scale application of this technology.

show abstract

“…This material is not reactive and it has a low hydraulic conductivity, low cation exchange capacity and zero organic content [36][37][38]. The atrazine was selected as a model organic compound and it was obtained from Fluka.…”

Section: Methodsmentioning

confidence: 99%

Combined soil washing and CDEO for the removal of atrazine from soils

Santos

Sáez

Martínez‐Huitle

et al. 2015

Journal of Hazardous Materials

Self Cite

View full text Add to dashboard Cite

In this work, it is studied the removal of atrazine from spiked soils by soil washing using surfactant fluids, followed by the treatment of the resulting washing waste by electrolysis with boron doped diamond (BDD) anode. Results confirm that combination of both technologies is efficient for the removal and total mineralization of atrazine. Ratio surfactant/soil is a key parameter for the removal of atrazine from soil and influences significantly in the characteristic of the wastewater produced, affecting not only to the total organic load but also to the mean size of micelles. The higher the ratio surfactant soil, the lower is the size of the particles. Electrolyses of this type of waste attain the complete mineralization. TOC and COD are removed from the start of the treatment but the key of the treatment is the reduction in size of the micelles, which lead to a higher negative charge in the surface and to the faster depletion of the surfactant as compared with the pesticide.

show abstract

Electro-osmotic fluxes in multi-well electro-remediation processes

Cited by 31 publications

References 46 publications

Electrokinetic remediation of soil polluted with insoluble organics using biological permeable reactive barriers: Effect of periodic polarity reversal and voltage gradient

Electrokinetic remediation of soil polluted with insoluble organics using biological permeable reactive barriers: Effect of periodic polarity reversal and voltage gradient

Removal of oxyfluorfen from spiked soils using electrokinetic soil flushing with the surrounding arrangements of electrodes

Combined soil washing and CDEO for the removal of atrazine from soils

Contact Info

Product

Resources

About