Enhancement and inhibition of microbial activity in hydrocarbon- contaminated arctic soils: Implications for nutrient-amended bioremediation

Joan F. Braddock, Marian L. Ruth, Peter H. Catterall, James L Walworth, Kathleen A. Mccarthy

Research output: Contribution to journalArticle

190 Citations (Scopus)

Abstract

Bioremediation is being used or proposed as a treatment option at many hydrocarbon-contaminated sites. One such site is a former bulk-fuel storage facility near Barrow, AK, where contamination persists after approximately 380 m3 of JP-5 was spilled in 1970. The soil at the site is primarily coarse sand with low organic carbon (<1%) end low moisture (1-3%) contents. We examined the effects of nutrient additions on microorganisms in contaminated soil from this site in laboratory microcosms and in mesocosms incubated for 6 weeks in the field. Nitrogen was the major limiting nutrient in this system, but microbial populations and activity were maximally enhanced by additions of both nitrogen and phosphorus. When nutrients were added to soil in the field at three levels of N:P (100:45, 200:90, and 300:135 mg/kg soil), the greatest stimulation in microbial activity occurred at the lowest, rather than the highest, level of nutrient addition. The total soil-water potentials ranged from -2 to -15 bar with increasing levels of fertilizer. Semivolatile hydrocarbon concentrations declined significantly only in the soils treated at the low fertilizer level. These results indicate that an understanding of nutrient effects at a specific site is essential for successful bioremediation.

Original languageEnglish (US)
Pages (from-to)2078-2084
Number of pages7
JournalEnvironmental Science and Technology
Volume31
Issue number7
DOIs
StatePublished - Jul 1997
Externally publishedYes

Fingerprint

Bioremediation
Hydrocarbons
bioremediation
Nutrients
microbial activity
hydrocarbon
Soils
nutrient
soil
Fertilizers
fertilizer
Nitrogen
soil water potential
nitrogen
Fuel storage
microcosm
Organic carbon
Microorganisms
Phosphorus
microorganism

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Enhancement and inhibition of microbial activity in hydrocarbon- contaminated arctic soils : Implications for nutrient-amended bioremediation. / Braddock, Joan F.; Ruth, Marian L.; Catterall, Peter H.; Walworth, James L; Mccarthy, Kathleen A.

In: Environmental Science and Technology, Vol. 31, No. 7, 07.1997, p. 2078-2084.

Research output: Contribution to journalArticle

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