Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 20, Pages 21052-21058Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-019-05477-4
Keywords
Synthetic consortium; Biodegradation; Immobilization; Benzo[a]pyrene
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Funding
- National Natural Science Foundation of China [51508111]
- Natural Science Foundation of Guangdong Province, China [2016A030313222]
- Pearl River S&T Nova Program of Guangzhou, China [201806010050]
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Bioaugmentation is an effective approach to remove the benzo[a]pyrene (BaP) from the environment, while its effect depends on the functional stability of the inoculated microorganisms. The aim of this study is to develop an approach on reducing the mutual exclusion of bacteria in the synthetic consortium in BaP degradation. Eight BaP-degrading bacterial strains were isolated from an enrichment with BaP as the sole carbon source. Two strains of Cupriavidus spp. exhibited greater degradation capacity (3.02-3.30 mg L-1 day(-1)) and selected as the good degraders in the synthetic consortia. Because of the mutual exclusion, the BaP-degradation capacity was reduced (1.47-1.77 mg L-1 day(-1)) when the other strains were added into good degraders through directly mixing the inocula. This mutual exclusion was mitigated through independent immobilization, in which the strains were embedded in sodium alginate before constructing the consortium. The consortium constructed by independent immobilization exhibited comparable BaP-degradation capacity with the high efficient strains. Therefore, the independent immobilization can be an advanced approach in functional consortium synthesis.
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