氯代二恶英微生物降解性的初步探讨

本研究通过分离和筛选，从氯苯生产车间附近土壤和施用五氯酚除草剂的湖泊底泥中选出八支菌株，均能降解一氯代二恶英，３周内最多可降解４５％，但随氯取代数的增加而降解能力减弱，多数菌株不能降解三氯代二恶英，选择邻二氯苯为共代谢物的初级营养物，４１号株３周内可降解３３％三氯代苯基二恶英，说明选择适当的共代谢物，可改善微生物对高氯代二恶英的降解性。

A PRELIMINARY APPROACH TO BIODEGRADATION OF POLYCHLORINATED DIBENZO-p-DIOXINS (PCDDs)

In this research 8 bacteria strains were screened from soil samples nearby workshop producing chlorinated benzene and from sediments of lakes of high herbicide application. All these strains can degrade 2-chlorinated dibenzo-p-dioxin with 45% of the greatest quantity of degradation for 3 weeks. The extent of biodegradation decreases with increasing chlorine substitution. Most of these strains can not degrade 2,3,7-TrCDD while the strain 41# can degrade 33% of it for 3 weeks using dichlorinated benzene as primary nutrient of co-metabolism. This result suggested that the biodegradation of PCDDs could be improved by selecting appropriate primary untried of co-metabolism.