Silva, E. and Fialho, A.M. and Sa-Correia, I. and Burns, R.G. and Shaw, L.J. (2004) Combined bioaugmentation and biostimulation to cleanup soil contaminated with high concentrations of atrazine. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 38 (2). pp. 632-637. ISSN 0013-936X.
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Abstract
We developed a joint bioaugmentation and biostimulation approach for the clean up of soil contaminated with high (168.7 and 337.4 mug g(-1)) concentrations of the herbicide atrazine (2-chloro-4-(ethylamino)-6-isopropylamino-s-triazine). Pseudomonas sp. strain ADP (P. ADP) was used for bioaugmentation (-10(7) cells g(-1) soil), and citrate (concentration range 5.8-40 mg g(-1) soil) and succinate (6.2-30.8 mg g(-1)) were used for biostimulation. The study soil had indigenous potential for atrazine mineralization (54.4 +/- 2% of 168.7 mug g(-1) mineralized after 67 day), but rapid mineralization only took place after a prolonged acclimation phase (similar to28 days). Inoculation with P. ADP alone resulted in a limited improvement in mineralization (e.g., 30.6 +/- 1% mineralization of 168.7 mug g(-1) of atrazine in inoculated soil cf. <0.5% in noninoculated in 7 days). Quantification of surviving numbers of P. ADP revealed a 10-fold decline from initial levels. However, bioaugmentation together with citrate or succinate biostimulation markedly increased P. ADP cell survival and atrazine mineralization (e.g., addition of 11.6 mg g(-1) of citrate increased mineralization of 337.4 mug g(-1) of atrazine from <2 to 79.9 +/- 1% in 13 days). A critical parameter in determining the extent of atrazine mineralization by P. ADP was C-s:N-atz (soluble carbon to atrazine nitrogen ratio): C-s:N-atz > 40 was required for maximal atrazine mineralization. We suggest our observations may be used as a framework for rational bioremediation of field soils contaminated with atrazine.
| Item Type: | Article |
|---|---|
| Additional information: | Article 763XB English Times Cited:12 Cited References Count:56 |
| Subjects: | Q Science |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Biosciences |
| Depositing User: | Sue Davies |
| Date Deposited: | 10 Sep 2008 14:35 |
| Last Modified: | 14 Jan 2010 14:25 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/6743 (The current URI for this page, for reference purposes) |
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