I D
× COMMENTARYCOVER STORYIN THE NEWSCHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGENGINEERING PRACTICEENVIRONMENTAL MANAGEREQUIPMENT & SERVICESFOCUS
Focus on Valves
    A new motorized control valve for the semiconductor…
NEW PRODUCTS + Show More

Comment PDF

Combined membrane separation and electrokinetics speeds soil remediation

By Paul Grad |

Toxic heavy metals can be drawn out of soils far more quickly than the traditional methods using a process developed by a team from the Technical University of Denmark (DTU; Lyngby; www.dtu.dk) and the Universidad Técnica Federico Santa María (Valparaíso, Chile; www.usm.cl). Conventional electrokinetic methods apply a strong d.c. electric field to cause ions of heavy metals, such as cadmium, copper, zinc, lead and chromium, to migrate through the soil. However, this process can take months to achieve adequate cleanup. The team combined traditional electrokinetic soil remediation with conventional electrodialysis, resulting in a faster and more thorough way of cleaning soils contaminated with heavy metals. DTU’s team member Lisbeth Ottosen explains that, in the new setup, soil is treated in suspension, and ion exchange membranes separate the soil suspension and the processing solutions at the electrodes. The addition of ion exchange membranes ensures the main direction for the electromigration within the contaminated soil is out of the soil. Laboratory experiments were conducted in cylindrical PMMA (polymethyl methacrylate) partitioned into a central compartment and two electrode compartments. An anion…
Related Content

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Metering gas in biogas plants
Wet process analyzer for FPD and solar cell manufacturing for semi-conductors
Fluidized bed drying and cooling for temperature-sensitive polymers and plastics
CoriolisMaster: The SmartSensor solution
The Big 6 flowmeter technologies: Where to use them and why

View More