Degradation of Phenanthrene and Pyrene by Burkholderia sp. D5

Burkholderia sp. D5에 의한 phenanthrene과 pyrene 분해

  • Kim, Tae-Jeong (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Jo, Gyeong-Suk (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Ryu, Hui-Uk (Department of Chemicaland Environmental Engineering, Soongsil University)
  • 김태정 (이화여자대학교 환경학과) ;
  • 조경숙 (이화여자대학교 환경학과) ;
  • 류희욱 (숭실대학교 환경화학공학과)
  • Published : 2003.01.01

Abstract

Burkholderia sp. D5, a polyaromatic hydrocarbons(PAHs)-degrading bacterium, was isolated from oil-contaminated soil. The bacterium could utilize phenanthrene (Phe) as a sole carbon source but could not use pyrene (Pyr). However, the strain could degrade Pyr when a cosubstrate such as yeast extract (YE) was supplemented. The PAH degradation rate of the bacterium was enhanced by the addition of other organic materials such as YE, peptone and glucose. YE was a particularly effective additive in stimulating cell growth as well as PAH degradation. When 1 g-YE/L was supplemented into the basal salt medium (BSM) with 215 mg-Phe/L, the specific growth rate (0.28 h-1) and Phe-degrading rate (29.30 μmol/L/h) were enhanced approximately ten and two times more than those obtained in the BSM with 215 mg-Phe/L, respectively. Through kinetic analysis, the maximum specific growth rate (μmax) and PAH degrading rate (Vmax) for Phe were obtained as 0.34/h and 289 ${\mu}mol$/L/h, respectively. Also, μmax and Vmax for Pyr were 0.27 h-1 and 50 ${\mu}mol$/L/h, respectively. The degradation rates for each Phe (2.20 μmol/L/h) and Pyr (2.18 μmol/L/h) were lower in mixture substrates than in a single substrate (29.30 ${\mu}mol$/L/h and 9.58 ${\mu}mol$/L/h, respectively). Burkholderia sp. D5 can degrade Phe and Pyr contained in soil, and the PAH degradation rates in soil were 20.03 ${\mu}mol$/L/h for Phe and 1.09 ${\mu}mol$/L/h for Pyr.