Electrically enhanced crossflow membrane filtration of oily waste water using the membrane as a cathode

Hanna Huotari (Corresponding Author), Ingmar Huisman, Gun Trägårdh

Research output: Contribution to journalArticleScientificpeer-review

73 Citations (Scopus)

Abstract

The effect of an external electric field on the flux in crossflow membrane filtration of a model oily waste water was studied using a carbon fibre – carbon composite membrane as a cathode. Limiting fluxes for low flow rate increased significantly under the conditions studied, from 75 l/m2 h without an electric field to more than 350 l/m2 h using an electric field. The experimentally determined increase in the limiting flux showed good agreement with the theoretical value of 430 l/m2 h calculated using a simple model. The limiting flux increase was affected by the electrophoretic mobility of the oil droplets and the applied electric field strength. When there were no cakes without an electric field due to the high flow rate, the flux increase when using an electric field under at the same conditions was minor. The critical electric field strength was determined, and experimentally obtained values were corresponded with calculated values. Decreasing the crossflow velocity above the critical electric field strength increased the flux, or had no effect, depending on the size of the particles. Permeate quality was also improved to some extent when using the electric field, and a membrane with a large pore size could be used when an electric field was applied. The main disadvantage in using the membrane as a cathode was foaming at the membrane surface causing decrease in the flux enhancement as the conductivity of the feed increased. It was not possible to restore the flux to the original value by applying an electric field after filtration of the oil emulsion without an electric field. An intermittent electric field was thus not efficient enough for keeping the flux at high level.
Original languageEnglish
Pages (from-to)49-60
Number of pages12
JournalJournal of Membrane Science
Volume156
Issue number1
DOIs
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

Fingerprint

waste water
Waste Water
Electrodes
Wastewater
Cathodes
cathodes
Electric fields
membranes
Membranes
electric fields
Fluxes
Oils
electric field strength
Emulsions
Particle Size
Carbon
flow velocity
oils
foaming
Flow rate

Keywords

  • wastes
  • waste water
  • oil
  • contamination
  • decontamination
  • membranes
  • filtration
  • cathodes
  • electric field
  • ultrasound
  • ultrasonics

Cite this

Huotari, Hanna ; Huisman, Ingmar ; Trägårdh, Gun. / Electrically enhanced crossflow membrane filtration of oily waste water using the membrane as a cathode. In: Journal of Membrane Science. 1999 ; Vol. 156, No. 1. pp. 49-60.
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abstract = "The effect of an external electric field on the flux in crossflow membrane filtration of a model oily waste water was studied using a carbon fibre – carbon composite membrane as a cathode. Limiting fluxes for low flow rate increased significantly under the conditions studied, from 75 l/m2 h without an electric field to more than 350 l/m2 h using an electric field. The experimentally determined increase in the limiting flux showed good agreement with the theoretical value of 430 l/m2 h calculated using a simple model. The limiting flux increase was affected by the electrophoretic mobility of the oil droplets and the applied electric field strength. When there were no cakes without an electric field due to the high flow rate, the flux increase when using an electric field under at the same conditions was minor. The critical electric field strength was determined, and experimentally obtained values were corresponded with calculated values. Decreasing the crossflow velocity above the critical electric field strength increased the flux, or had no effect, depending on the size of the particles. Permeate quality was also improved to some extent when using the electric field, and a membrane with a large pore size could be used when an electric field was applied. The main disadvantage in using the membrane as a cathode was foaming at the membrane surface causing decrease in the flux enhancement as the conductivity of the feed increased. It was not possible to restore the flux to the original value by applying an electric field after filtration of the oil emulsion without an electric field. An intermittent electric field was thus not efficient enough for keeping the flux at high level.",
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Electrically enhanced crossflow membrane filtration of oily waste water using the membrane as a cathode. / Huotari, Hanna (Corresponding Author); Huisman, Ingmar; Trägårdh, Gun.

In: Journal of Membrane Science, Vol. 156, No. 1, 1999, p. 49-60.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Huisman, Ingmar

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N2 - The effect of an external electric field on the flux in crossflow membrane filtration of a model oily waste water was studied using a carbon fibre – carbon composite membrane as a cathode. Limiting fluxes for low flow rate increased significantly under the conditions studied, from 75 l/m2 h without an electric field to more than 350 l/m2 h using an electric field. The experimentally determined increase in the limiting flux showed good agreement with the theoretical value of 430 l/m2 h calculated using a simple model. The limiting flux increase was affected by the electrophoretic mobility of the oil droplets and the applied electric field strength. When there were no cakes without an electric field due to the high flow rate, the flux increase when using an electric field under at the same conditions was minor. The critical electric field strength was determined, and experimentally obtained values were corresponded with calculated values. Decreasing the crossflow velocity above the critical electric field strength increased the flux, or had no effect, depending on the size of the particles. Permeate quality was also improved to some extent when using the electric field, and a membrane with a large pore size could be used when an electric field was applied. The main disadvantage in using the membrane as a cathode was foaming at the membrane surface causing decrease in the flux enhancement as the conductivity of the feed increased. It was not possible to restore the flux to the original value by applying an electric field after filtration of the oil emulsion without an electric field. An intermittent electric field was thus not efficient enough for keeping the flux at high level.

AB - The effect of an external electric field on the flux in crossflow membrane filtration of a model oily waste water was studied using a carbon fibre – carbon composite membrane as a cathode. Limiting fluxes for low flow rate increased significantly under the conditions studied, from 75 l/m2 h without an electric field to more than 350 l/m2 h using an electric field. The experimentally determined increase in the limiting flux showed good agreement with the theoretical value of 430 l/m2 h calculated using a simple model. The limiting flux increase was affected by the electrophoretic mobility of the oil droplets and the applied electric field strength. When there were no cakes without an electric field due to the high flow rate, the flux increase when using an electric field under at the same conditions was minor. The critical electric field strength was determined, and experimentally obtained values were corresponded with calculated values. Decreasing the crossflow velocity above the critical electric field strength increased the flux, or had no effect, depending on the size of the particles. Permeate quality was also improved to some extent when using the electric field, and a membrane with a large pore size could be used when an electric field was applied. The main disadvantage in using the membrane as a cathode was foaming at the membrane surface causing decrease in the flux enhancement as the conductivity of the feed increased. It was not possible to restore the flux to the original value by applying an electric field after filtration of the oil emulsion without an electric field. An intermittent electric field was thus not efficient enough for keeping the flux at high level.

KW - wastes

KW - waste water

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KW - contamination

KW - decontamination

KW - membranes

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KW - cathodes

KW - electric field

KW - ultrasound

KW - ultrasonics

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