Bioremediation of PCB-contaminated shallow river sediments: The efficacy of biodegradation using individual bacterial strains and their consortia
| Autor: | Hana Horváthová, Katarína Lászlová, Katarína Dercová |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Geologic Sediments Bioaugmentation Environmental Engineering Ochrobactrum anthropi Stenotrophomonas maltophilia Health Toxicology and Mutagenesis Microbial Consortia 010501 environmental sciences 01 natural sciences Microbiology 03 medical and health sciences Bioremediation Rivers Rhodococcus Environmental Chemistry 0105 earth and related environmental sciences biology Public Health Environmental and Occupational Health food and beverages General Medicine General Chemistry Achromobacter xylosoxidans Biodegradation Contamination biology.organism_classification Polychlorinated Biphenyls Pollution Biodegradation Environmental 030104 developmental biology Environmental chemistry Ecotoxicity |
| Zdroj: | Chemosphere. 193:270-277 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.11.012 |
| Popis: | Elimination of dangerous toxic and hydrophobic chlorinated aromatic compounds, mainly PCBs from the environment, is one of the most important aims of the environmental biotechnologies. In this work, biodegradation of an industrial mixture of PCBs (Delor 103, equivalent to Aroclor 1242) was performed using bacterial consortia composed of four bacterial strains isolated from the historically PCB-contaminated sediments and characterized as Achromobacter xylosoxidans, Stenotrophomonas maltophilia, Ochrobactrum anthropi and Rhodococcus ruber. The objective of this research was to determine the biodegradation ability of the individual strains and artificially prepared consortia composed of two or three bacterial strains mentioned above. Based on the growth parameters, six consortia were constructed and inoculated into the historically contaminated sediment samples collected in the efflux canal of Chemko Stražske plant – the former producer of the industrial mixtures of PCBs. The efficacy of the biotreatment, namely bioaugmentation, was evaluated by determination of ecotoxicity of treated and non-treated sediments. The most effective consortia were those containing the strain R. ruber. In the combination with A. xylosoxidans, the biodegradation of the sum of the indicator congeners was 85% and in the combination with S. maltophilia nearly 80%, with inocula applied in the ratio 1:1 in both cases. Consortium containing the strain R. ruber and S. maltophilia showed pronounced degradation of the highly chlorinated PCB congeners. Among the consortia composed of three bacterial strains, only that consisting of O. anthropi, R. ruber and A. xylosoxidans showed higher biodegradation (73%). All created consortia significally reduced the toxicity of the contaminated sediment. |
| Databáze: | OpenAIRE |
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