Ground Effects EK3 technology successfully treated and removed hexavalent chromium from low permeable soils to below detection limits over a 12 day period.

The Situation

Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is used in textile dyes, wood preservation, anti corrosion products, chromate conversion products and a variety of niche uses. These industrial uses can lead to contamination of soil, surface and ground water.  Traditional remediation strategies include, reducing toxicity through chemical or biological means, removal of the contamination (relocated the contamination to a landfill), and containment through engineered barriers.  These options are often time consuming, expensive and other than removal, have limited long term success.   


The Solution

Ground Effects has developed the EK3 technology that will remediate hexavalent chromium impacted soils, specifically low permeability soils in situ.

Due to the low permeability of soils, in situ treatment is cost effective and efficient.  The EK3 utilizes both electroosmosis and electromigration principles to uniformly move nutrient reagent through these soils to infultrate, actively treat and remove the contaminants. Electroosmosis moves the solution from the anode to the cathode which aids in the movement of the contaminants from the soil. Electromigration occurs when the electrical field created causes the hexavalent chromium to move towards the negative electrode (cathode). Once collected, the contaminants can be extracted by vacuum extraction.


The Results

The EK uses DC current to reduce the concentration of hexavalent chromium to non detect levels within a 12 day period. 

Sample NumberUnitConcentrationPercent (%) Removal
Sample 1mg/L0.263
Sample 2mg/L0.2524
Sample 3mg/L0.19525.8
Sample 4mg/L0.031787.9
Sample 5mg/L0.00052999.7
Sample 6mg/L0.00037399.8
Sample 7mg/LNot Detected100

Case Study

California, USA
Key Product
Electrokinetic Remediation System
Extracted Contaminants
Hexavalent Chromium
Extractable Hydrocarbons
Heavy metals

Reference Case