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Journal of Environmental and Public Health
Volume 2013 (2013), Article ID 973165, 7 pages
http://dx.doi.org/10.1155/2013/973165
Research Article

Study of the Bioremediation of Atrazine under Variable Carbon and Nitrogen Sources by Mixed Bacterial Consortium Isolated from Corn Field Soil in Fars Province of Iran

1Environmental Health Engineering Department, School of Health, Health Faculty, Shiraz University of Medical Sciences, Shiraz, Iran
2Environmental Health Engineering Department, Health Faculty, Tehran University of Medical Sciences, Tehran, Iran
3Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Received 27 October 2012; Revised 1 January 2013; Accepted 5 February 2013

Academic Editor: Mohammad Mehdi Amin

Copyright © 2013 Mansooreh Dehghani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Atrazine herbicide that is widely used in corn production is frequently detected in water resources. The main objectives of this research were focused on assessing the effects of carbon and nitrogen sources on atrazine biodegradation by mixed bacterial consortium and by evaluating the feasibility of using mixed bacterial consortium in soil culture. Shiraz corn field soil with a long history of atrazine application has been explored for their potential of atrazine biodegradation. The influence of different carbon compounds and the effect of nitrogen sources and a different pH (5.5–8.5) on atrazine removal efficiency by mixed bacterial consortium in liquid culture were investigated. Sodium citrate and sucrose had the highest atrazine biodegradation rate (87.22%) among different carbon sources. Atrazine biodegradation rate decreased more quickly by the addition of urea (26.76%) compared to ammonium nitrate. Based on the data obtained in this study, pH of 7.0 is optimum for atrazine biodegradation. After 30 days of incubation, the percent of atrazine reduction rates were significantly enhanced in the inoculated soils (60.5%) as compared to uninoculated control soils (12%) at the soil moisture content of 25%. In conclusion, bioaugmentation of soil with mixed bacterial consortium may enhance the rate of atrazine degradation in a highly polluted soil.