Removal of tetrachloroethylene in an anaerobic column bioreactor

C. Noftsker, Maribeth E Watwood

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Removal of tetrachloroethylene (perchloroethylene; C2Cl4) by microbial consortia from two sites with different C2Cl4 exposure histories was examined in a bench-scale anaerobic column bioreactor. It was hypothesized that optimal removal would be observed in the reactor packed with sediments having an extensive exposure history. Microbial consortia were enriched from hyporheic-zone (HZ) sediments from the Portneuf aquifer near Pocatello, Idaho, and from industrial-zone (IZ) sediments from a highly contaminated aquifer in Portland, Oregon. Lactate and acetate were the electron donors during experiments conducted over 9 and 7 months for HZ and IZ sediments, respectively. In the HZ bioreactor, the retention time ranged from 31 h to 81 h, and inlet C2Cl4 concentrations ranged from 0.1 ppm to 1.0 ppm. Dechlorination of C2Cl4 averaged 60% and reached a maximum of 78%. An increase in C:N from 27:1 to 500:1 corresponded to an 18% increase in removal efficiency. Trichloroethylene production corresponded to decreased effluent C2Cl4; further intermediates were not detected. In the IZ bioreactor, the retention time varied from 34 h to 115 h; the inlet C2Cl4 concentration was 1.0 ppm. C2Cl4 removal averaged 70% with a maximum of 98%. Trichloroethylene and cis-dichloroethylene were detected in the effluent. Increases in C:N from 50:1 to 250:1 enhanced dechlorination activity.

Original languageEnglish (US)
Pages (from-to)424-430
Number of pages7
JournalApplied Microbiology and Biotechnology
Volume48
Issue number3
DOIs
StatePublished - 1997
Externally publishedYes

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Tetrachloroethylene
Bioreactors
Microbial Consortia
Trichloroethylene
Sediments
Groundwater
Dechlorination
Dichloroethylenes
Aquifers
Effluents
Lactic Acid
Acetates
History
Electrons
Experiments

ASJC Scopus subject areas

  • Biotechnology
  • Microbiology
  • Bioengineering

Cite this

Removal of tetrachloroethylene in an anaerobic column bioreactor. / Noftsker, C.; Watwood, Maribeth E.

In: Applied Microbiology and Biotechnology, Vol. 48, No. 3, 1997, p. 424-430.

Research output: Contribution to journalArticle

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