Nutrient and temperature interactions in bioremediation of petroleum-contaminated cryic soil

J. Walworth, V. Chaobal

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

A factorial study was performed using a sandy, petroleum-contaminated subsoil from Fort Wainwright, Alaska, to examine the effect of temperature, moisture content, nutrient levels, and diesel range organic (DRO) concentration on microbial activity at a cold climate bioremediation site. In soils with 500 mg/kg of DRO, soil heating and nutrient addition slightly increased biodegradation rates, implying a substrate limitation. With 8100 mg/kg of DRO, soil warming increased the microbial activity, suggesting that low soil temperature was the main factor limiting biodegradation rates at this site. Maximum microbial activity was achieved at ~ 21°C, with little or no additional increase at 31°C. Heating the soil to 41°C decreased biodegradation rates. Addition of nitrogen and phosphorus to soil heated at > 1°C increased biodegradation. Soil nitrogen concentration was the more essential factor in maximizing biodegradation rates.

Original languageEnglish (US)
Pages3/-
StatePublished - Dec 1 1999
EventProceedings of the 1999 5th International In Situ and On-Site Bioremediation Symposium - San Diego, CA, United States
Duration: Apr 19 1999Apr 22 1999

Other

OtherProceedings of the 1999 5th International In Situ and On-Site Bioremediation Symposium
CountryUnited States
CitySan Diego, CA
Period4/19/994/22/99

ASJC Scopus subject areas

  • Energy(all)

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