1998 Fiscal Year Final Research Report Summary
Development of purification methods for solids contaminated by hydrocarbon from mineral oils.
Grant-in-Aid for Scientific Research (A)
|Allocation Type||Single-year Grants |
|Research Institution||KYOTO UNIVERSITY |
TERASHIMA Yutaka Kyoto University Faculty of Engineering Professor -> 京都大学, 工学研究科, 教授 (50019717)
MIYAKE Syunsaku Organo Co.Ltd Division of Earth Environment Head of the Division, 地球環境部, 部長(研究職)
KOSHIKAWA Hiromoto Kyoto University Faculty of Engineering Instructor, 工学研究所, 助手 (70273480)
SHIMIZU Yoshihisa Kyoto University Faculty of Engineering Associate Professor, 工学研究科, 助教授 (20226260)
|Project Period (FY)
1996 – 1998
|Keywords||white rot fungus / Phanerochaete chrysosporium / ligninolytic enzymes / mineral oil / degradation / treatment|
The environmental factors influencing the growth characterization of the white rot fungus P.chrysosporium, the degradation of several kinds of recalcitrant substance, and the activities of extracellular enzymes were investigated by batch culture experiments. The possibility of applying this fungus for the removal of the recalcitrant substance from contaminated soil were also evaluated.
Main results were summarized as follows ;
1) The temperature and pH effect the growth of the P.chrysosporium significantly, and the presence of vitamins especially, thiamin was necessary for its growth.
2) LiP activity appeared after glucose depletion, MnP appeared after glucose or nitrogen depletion. Higher LiP activity was obtained by increasing the nitrogen concentration.
3) Amino acid, NO_3^-, NH can be used as nitrogen source of P.chrysosporium, but NH_4^+ was proved to be the best.
4) The polyurethane foam was found to be the best carrier of P.chrysosporium according to the results of ligninase production. And P.chrysosporium can grow without addition of medium when immobilized on aspen chips.
5) LiP and MnP production was obtained in the batch reactor using P.chrysosporium immobilized on polyurethane foam.
6) 1,000mg/L of heavy oil A was degraded by the extracellular enzymes in liquid medium.
7) P.chrysosporium was inoculated soils contaminated by heavy oil A, the concentration of oil in soil was measured. The oil was degraded, but the rate was slower than in the case of liquid medium.
These results suggest the possibility of decontamination of soils by P.chrysosporium.
Research Products (8 results)