Microbial community structure in a thermophilic anaerobic hybrid reactor degrading terephthalate

Chia Lung Chen, Hervé Macarie, Ignacio Ramirez, Alejandro Olmos, Say Leong Ong, Oscar Monroy, Wen Tso Liu

Research output: Contribution to journalArticle

Abstract

A thermophilic terephthalate-degrading methanogenic consortium was successfully enriched for 272 days in an anaerobic hybrid reactor, and the microbial structure was characterized using terminal RFLPs, clone libraries and fluorescence in-situ hybridization with rRNA-targeted oligonucleotide probes. All the results suggested that Methanothrix thermophila-related methanogens, Desulfotomaculum-related bacterial populations in the Gram-positive low-G + C group, and OP5-related populations were the key members responsible for terephthalate degradation under thermophilic methanogenic conditions except during periods when the reactor experienced heat shock and pump failure. These perturbations caused a significant shift in bacterial population structure in sludge samples taken from the sludge bed but not from the surface of the packing materials. After system recovery, many other bacterial populations emerged, which belonged mainly to the Gram-positive low-G + C group and Cytophaga-Flexibacter-Bacteroides, as well as β-Proteobacteria, Planctomycetes and Nitrospira. These newly emerged populations were probably also capable of degrading terephthalate in the hybrid system, but were out-competed by those bacterial populations before perturbations.

Original languageEnglish (US)
Pages (from-to)3429-3440
Number of pages12
JournalMicrobiology
Volume150
Issue number10
DOIs
StatePublished - Oct 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology

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