Journal
BIORESOURCE TECHNOLOGY
Volume 232, Issue -, Pages 146-151Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.01.069
Keywords
2,4-Dichlorophenoxyacetic acid; Acetate; Bacterial community
Funding
- National Natural Science Foundation of China [21307143]
- Key Research & Development Project of Shandong [2015GSF117016]
- National Twelve-Five Science and Technology Support Program Project of China [2014BAC31B01]
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Acetate can be used as an electron donor to stimulate 2,4-dichlorophenoxyacetic acid (2,4-D), which has not been determined under methanogenic condition. This study applied high-throughput sequencing and methanogenic inhibition approaches to investigate the 2,4-D degradation process using the enrichments obtained from paddy soil. Acetate addition significantly promoted 2,4-D degradation, which was 5-fold higher than in the acetate-unsupplemented enrichments in terms of the 2,4-D degradation rate constant. Dechloromonas and Pseudomonas were the dominant 2,4-D degraders. Methanogenic inhibition experiments indicated that the 2,4-D degradation was independent of methanogenesis. It was proposed that the accelerated 2,4-D degradation in the acetate-supplemented enrichment involved an unusual interaction, where members of the acetate oxidizers primarily oxidized acetate and produced H-2. H-2 was utilized by the 2,4-D degraders to degrade 2,4-D, but also partially consumed by the hydrogenotrophic methanogens to produce methane. The findings presented here provide a new strategy for the remediation of 2,4-D-polluted soils. (C) 2017 Elsevier Ltd. All rights reserved.
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