کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6452865 | 1361497 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Immobilisation in Ca-alginate improved bacterial tolerance to Cr(VI) and phenol.
- Efficient co-remediation of Cr(VI) and phenol by an immobilised bacterial consortium.
- The entrapped bacterial consortium SFC 500-1 enzymatically reduced Cr(VI) to Cr(III).
- Catechol and cis,cis-muconate were the intermediary metabolites of phenol degradation.
- Immobilised cells showed high removal potential after reutilisation and long storage times.
Microbial bioremediation emerged some decades ago as an eco-friendly technology to restore polluted sites. Traditionally, the search for microorganisms suitable for bioremediation has been based on the selection of isolated strains able to remove a specific type of pollutant. However, this strategy has now become obsolete, since co-pollution is a global reality. Thus, current studies attempt to find bacterial cultures capable of coping with a mixture of organic and inorganic compounds. In this sense, the bacterial consortium SFC 500-1 has demonstrated efficiency for Cr(VI) and phenol removal, both of which are found in many industrial wastewaters. In the present study, the ability of SFC 500-1 for simultaneous removal was improved through its entrapment in a Ca-alginate matrix. This strategy led to an increased removal of Cr(VI), which was partially reduced to Cr(III). Immobilised cells were able to tolerate and degrade phenol up to 1,500Â mg/l at high rates, forming catechol and cis,cis-muconate as oxidation intermediates. Successful removal potential through 5 cycles of reuse, as well as after long-term storage, was another important advantage of the immobilised consortium. These characteristics make SFC 500-1 an interesting system for potential application in the biotreatment of co-polluted effluents.
Journal: New Biotechnology - Volume 37, Part B, 25 July 2017, Pages 172-179