Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4364764 | International Biodeterioration & Biodegradation | 2014 | 6 Pages |
Abstract
This research describes indigenous Raoultella planticola bacterial cells which were isolated from the wastewater treatment plant of a herbicide factory. The optimum conditions for degrading atrazine were at pH = 7 and 28 °C, with a degradation rate of 10 mg Lâ1 hâ1. Biodegradation was observed at temperatures of 45 and 4 °C and partial degradation was also observed at extreme pH values (3 and 10). The degradation rates to reach 50% depletion of atrazine were 9.42, 7.42 and 5.42 mg Lâ1 hâ1 in the presence of acetonitrile, phenol or toluene, respectively. Successful inoculation of R. planticola into the original sludge from the herbicide factory led to atrazine degradation within 3 h, instead of 3 days without the inoculation. R. planticola developed a massive biofilm when exposed to atrazine. The results indicate that the isolated R. planticola strain can be added to the arsenal of atrazine-degrading bacterial cells that have the ability to degrade this substance under unfavorable conditions, such as those existing in the sludge of herbicide factories. In addition, the isolated strain showed an ability to form a biofilm, which can be utilized for improving the wastewater treatment.
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Authors
Nissim Swissa, Yeshayahu Nitzan, Yakov Langzam, Rivka Cahan,