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Appl Environ Microbiol, April 1998, p. 1319-1322, Vol. 64, No. 4
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Biodegradation of Metal-EDTA Complexes by an Enriched Microbial Population

Russell A. P. Thomas,1 Kirsten Lawlor,2 Mark Bailey,2 and Lynne E. Macaskie1,*

School of Biological Sciences, The University of Birmingham, Birmingham B15 2TT,1 and NERC Institute of Virology and Environmental Microbiology, Oxford OX1 3SR,2 United Kingdom

Received 26 August 1997/Accepted 9 January 1998

A mixed culture utilizing EDTA as the sole carbon source was isolated from a mixed inoculum of water from the River Mersey (United Kingdom) and sludge from an industrial effluent treatment plant. Fourteen component organisms were isolated from the culture, including representatives of the genera Methylobacterium, Variovorax, Enterobacter, Aureobacterium, and Bacillus. The mixed culture biodegraded metal-EDTA complexes slowly; the biodegradability was in the order Fe>Cu>Co>Ni>Cd. By incorporation of inorganic phosphate into the medium as a precipitant ligand, heavy metals were removed in parallel to EDTA degradation. The mixed culture also utilized a number of possible EDTA degradation intermediates as carbon sources.

* Corresponding author. Mailing address: School of Biological Sciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom. Phone: (44) 121-414-5889. Fax: (44) 121-414-6557. E-mail: L.E.Macaskie{at}bham.ac.uk.




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