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Aerobic dechlorination of low-chlorinated biphenyls by bacterial biofilms in packed-bed batch bioreactors.

Abstract：

:Cells of an aerobic three-membered bacterial co-culture, designated as ECO3, capable of cometabolizing and aerobically dechlorinating low-chlorinated biphenyls in the presence of biphenyl, were immobilized on Manville silica beads, on frosted-glass beads and on polyurethane foam cubes in packed-bed bioreactors continuously fed with a biphenyl-saturated air stream. The ECO3 biofilm reactors were found to be capable of extensively mineralizing several pure dichlorobiphenyls (75 mg/l) and Aroclor 1221 (75 mg/l) in batch mode. Immobilized ECO3 cells could aerobically degrade and dechlorinate the dichlorobiphenyls tested more extensively than suspended ECO3 cells. Among the three biofilm reactors, the glass bead bioreactor and the polyurethane bioreactor exhibited the highest capability of mineralizing both dichlorobiphenyls and Aroclor 1221; the polychlorinated biphenyl availability in the bioreactors more than the biomass availability, both depending on the nature of the support employed, significantly governed the efficiency of the treatment. These results are of interest for the possible development of a bioreactor system for continuous treatment of polychlorinated-biphenyl-contaminated wastewaters.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Fava F,Di Gioia D,Marchetti L,Quattroni G

doi

10.1007/BF00578472

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

562-8

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

45

pub_type

杂志文章

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