Capture of water-borne colloids in granular beds using external electric fields: Improving removal of Cryptosporidium parvum

Pramod Kulkarni, Gabriel Dutari, David Weingeist, Avner Adin, Roy Haught, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Suboptimal coagulation in water treatment plants often results in reduced removal efficiency of Cryptosporidium parvum oocysts by several orders of magnitude (J. AWWA 94(6) (2002) 97, J. AWWA 93(12) (2001) 64). The effect of external electric field on removal of C. parvum oocysts in packed granular beds was studied experimentally. A cylindrical configuration of electrodes, with granular media in the annular space was used. A negative DC potential was applied to the central electrode. No coagulants or flocculants were used and filtration was performed with and without application of an electric field to obtain improvement in removal efficiency. Results indicate that removal of C. parvum increased from 10% to 70% due to application of field in fine sand media and from 30% to 96% in MAGCHEM™ media. All other test particles (Kaolin and polystyrene latex microspheres) used in the study also exhibited increased removal in the presence of an electric field. Single collector efficiencies were also computed using approximate trajectory analysis, modified to account for the applied external electric field. The results of these calculations were used to qualitatively explain the trends in the experimental observations.

Original languageEnglish (US)
Pages (from-to)1047-1060
Number of pages14
JournalWater Research
Volume39
Issue number6
DOIs
StatePublished - Mar 2005
Externally publishedYes

Keywords

  • Cryptosporidium parvum
  • Electrostatic filtration
  • Granular filter models
  • Granular filtration

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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