Toxicity Estimation of Nonionic Surfactants and Their Effect on the Biodegradation of Polycyclic Aromatic Hydrocarbons (PAHs)

비이온계 계면활성제의 독성 평가 및 Polycyclic Aromatic Hydrocarbons(PAHs) 생분해에 미치는 영향

  • Park, Jong-Sup (Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
  • Kim, In S. (Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology) ;
  • Choi, Heechul (Department of Environmental Science & Engineering, Kwangju Institute of Science & Technology)
  • 박종섭 (광주과학기술원 환경공학과) ;
  • 김인수 (광주과학기술원 환경공학과) ;
  • 최희철 (광주과학기술원 환경공학과)
  • Received : 2000.06.13
  • Accepted : 2000.09.22
  • Published : 2000.12.31

Abstract

Toxicity estimation of three nonionic surfactants (Brij 30, Tween 80, Triton X-lOO) and their effect on the biodegradation of polycyclic aromatic hydrocarbons (PAHs) in the aqueous phase and soil slurry phase were investigated. Brij 30 was found to be the most biodegradable among the surfactants tested, and showed no substrate inhibition up to a concentration of 1.5 g/L. It was definitely utilized as a carbon source by the microorganisms. Naphthalene and phenanthrene in the aqueous phase were completely degraded by phenanthrene-acclimated cultures within 60 hours, but a substantial amount of naphthalene was lost due to the volatilization. The limiting step in the soil slurry bioremediation was bioavailablity by the microorganisms in the sand slurry and mass transfer from a solid to aqueous phase in the clay slurry. TOC analysis revealed that most of substrates including surfactant in the reactor were degraded. pH transition indicated that phenanthrene was metabolized into intermediates containing acid function.