Biodegradation kinetics of 2,4-dichlorophenol by acclimated mixed cultures

Date

2007-01-20

Author

ŞAHİNKAYA, Erkan
Dilek, Filiz Bengü

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The biodegradation kinetics of 2,4-dichlorophenol (2,4-DCP) by culture (Culture M) acclimated to mixture of 4-chlorophenol (4-CP) and 2,4-DCP and the culture (Culture 4) acclimated to 4-CP only were investigated in aerobic batch reactors. Also, pure strains isolated from mixed cultures were searched for their ability towards the biodegradation of 2,4-DCR Culture 4 was able to completely degrade 2,4-DCP up to 80 mg/L within 30 h and removal efficiency dropped to 21% upon increasing initial concentration to 108.8 mg/L. When the Culture M was used, complete degradation of 2,4-DCP in the range of 12.5-104.4 mg/L was attained. A linear relationship between time required for complete degradation and initial 2,4-DCP concentrations was observed for both mixed cultures. It was observed that the Haldane equation can be used to predict specific degradation rate (SDR) (R-2 > 0.99) as a function of initial 2,4-DCP concentrations and it adequately describes 2,4-DCP concentration profiles. Both of the mixed cultures settled well, which is important to maintain good removal efficiency for longer periods of time for real full-scale applications. Although the pure strains isolated from mixed cultures were found to have higher SDR of 2,4-DCP compared to mixed cultures, they did not settle well under quiescent conditions.

Subject Keywords

Biotechnology, Applied Microbiology and Biotechnology, General Medicine

URI

https://hdl.handle.net/11511/46037

Journal

JOURNAL OF BIOTECHNOLOGY

DOI

https://doi.org/10.1016/j.jbiotec.2006.08.009

Collections

Department of Environmental Engineering, Article

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Citation Formats

E. ŞAHİNKAYA and F. B. Dilek, “Biodegradation kinetics of 2,4-dichlorophenol by acclimated mixed cultures,” JOURNAL OF BIOTECHNOLOGY, pp. 716–726, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46037.