Biologische Sanierung von Carbochemie-Altlasten. Teilverbund 1: Humifizierung von PAK. Teilvorhaben 1/3: Pilzlicher Metabolismus Schlussbericht

Polycyclic aromatic hydrocarbons are resistant to microbial degradation in most natural environments. PAHs may be subject to humification processes which are responsible for the elimination of hardly degradable natural compounds. For the purpose of bioremediation of contaminated sites from carbochemical industry, the potential of soil micromycetes and of litter-decaying fungi to metabolize and to humify PAH in soil was examined. About 150 strains of fungi from contaminated sites and natural environments were screened for the activities of several oxidizing exoenzymes. The enzyme producing strains were further examined for degradation of PAHs. Micromycetes from contaminated soils showed only low activities of exoenzymes. Wooddecaying fungi revealed high activities which were correlated to the degradation of PAHs. Supplementation of soil with these fungi stimulated the degradation of PAHs in most soil cultures. A significant increase of the degradation was observed after supplementation of several growth substrates to the soil. In addition, the adsorption of PAH to fungal mycelia was evaluated. Several strains of fungi were determined that are promising organisms for technical applications within soil bioremediation processes. (orig.)SIGLEAvailable from TIB Hannover: F97B2021+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman