Transformation of hexabromocyclododecane in contaminated soil in association with microbial diversity

초록

This study evaluated the transformation of 1,2,5,6,9,10-hexabromocyclododecane (HBCD) in soil under various conditions. Under anaerobic conditions for 21 days, 34% of the total HBCD was reduced from rhizosphere soil containing humic acid, and 35% of the total HBCD was reduced from the non-rhizosphere soil; under aerobic conditions, 29% and 57-60% of the total HBCD were reduced from the same soil types after 40 days. Three HBCD isomers (alpha-, beta-, and gamma-HBCD) were separately analyzed for their isomeric effects on transformation. In the soils with added glucose as a carbon and energy source, the fraction of gamma-HBCD was reduced due to the blooming microbial activity. The population of Gram-positive bacteria decreased during the aerobic treatments of HBCD, whereas the population of several Gram-negative bacteria (e.g., Brassia rhizosphere, Sphingomonas sp.) increased. Humic acid and glucose increased the HBCD removal efficiency and microbial diversity in both rhizosphere and non-rhizosphere soils. (C) 2016 Elsevier B.V. All rights reserved.

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