สุกานดา เสนาะนิติ. Characterization of the Novel Hexachlorobenzene Dechlorination Anaerobic Consortia from a Contaminated Canal. Master's Degree(Environmental Engineering). King Mongkut's University of Technology Thonburi. : King Mongkut's University of Technology Thonburi, 2005.
Characterization of the Novel Hexachlorobenzene Dechlorination Anaerobic Consortia from a Contaminated Canal
Abstract:
For the purpose of investigating the characters of different microbial populations within the anaerobic consortia
from Hua-Lum-Poo canal, a variety of microbial inhibitors and a protein synthesis inhibitor coupled with electron donors and
electron acceptors were applied in the hexachlorobenzene(HCB) dechlorination experiments. The observed transformation
pathway was HCB pentachlorobenzene(QCB) 1,2,3,5-tetrachlorobenzene(1,2,3,5-TeCB) 1,3,5-trichlorobenzene
(1,3,5-TCB). Concurrently, the specificity of microbial activities involved in the dechlorination of HCB to 1,3,5-TCB was also
studied. Addition of electron donor (lactate, acetate and pyruvate) did not enhance the dechlorination ability. The dechlorination
of HCB was delayed by the addition of sulfate as electron acceptor. Furthermore, whenever sulfate combined with bromoethanesulfonate
(BES), the methanogen inhibitor, was added into cultural media, there is no HCB dechlorination occurring within 78 days.
For the mixed culture amended with nitrate, the enrichment of denitrifying bacteria did not show any inhibition on HCB dechlorination.
In the nitrate-amended experiments, HCB dechlorination was delayed in the set of amending nitrate plus BES, but the dechlorination
was accelerated in the set plus vancomycin which is the gram positive bacteria inhibitor. When the mixed culture was treated with
chloramphenicol(CAP), the protein synthesis inhibitor, the result showed that a concentration of 20 ug/ml of CAP did not inhibit
the microbial activity in the dechlorination of HCB, QCB and 1,2,3,5-TeCB.