Feasibility of ion exchange membranes to control pH during electro-osmotic consolidation

Lucas Martin, Jay Meegoda

Research output: Contribution to journalArticle

Abstract

Electro-osmosis is an established method of consolidating soft fine-grained soils. Its efficiency is controlled by the electrical resistance of the soil-electrode system. Because of an increase in soil electrical resistance during treatment, its cost efficiency is reduced, limiting the widespread use of this technique, especially in developed nations. One of the main causes of electrical resistance is hydrolysis of water molecules around the electrodes. The acidification of the anode, in particular, reduces the negative surface charge of clay particles and, thus, the zeta potential. According to the Helmholtz-Smoluchowski model, the zeta potential is directly proportional to the electro-osmotic permeability. This article studies the use of ion exchange membranes to assess their ability to prevent flow of hydrogen ions into the soil. The test with an anion exchange membrane showed minimal change of the pH in the soil around the anode compared to a control, which is better for electro-osmotic consolidation.

Original languageEnglish (US)
JournalGeotechnical Testing Journal
Volume43
Issue number3
DOIs
StatePublished - May 1 2020

Fingerprint

Ion exchange membranes
Consolidation
consolidation
ion exchange
Acoustic impedance
membrane
Soils
Zeta potential
soil
Anodes
electrode
Electroosmosis
Electrodes
Acidification
Surface charge
acidification
hydrolysis
Hydrolysis
electrokinesis
Ion exchange

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Keywords

  • Consolidation
  • Electro-osmosis
  • Ion exchange membrane
  • PH control

Cite this

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Feasibility of ion exchange membranes to control pH during electro-osmotic consolidation. / Martin, Lucas; Meegoda, Jay.

In: Geotechnical Testing Journal, Vol. 43, No. 3, 01.05.2020.

Research output: Contribution to journalArticle

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T1 - Feasibility of ion exchange membranes to control pH during electro-osmotic consolidation

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AU - Meegoda, Jay

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