Huma Farooq - Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), H-۱۲ Sector, Islamabad, Pakistan
Mehwish Khalid - Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), H-۱۲ Sector, Islamabad, Pakistan
Imran Hashmi - Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), H-۱۲ Sector, Islamabad, Pakistan

Synthetic pyrethroids are widely used for the improvement of crop production but are also regarded as potentially harmful pollutants. The present study aimed to evaluate the efficiency of different indigenous soil bacteria to degrade Lambda Cyhalothrin (LC), a known synthetic pyrethroid. The sampling area was selected as Rawal Lake and soil samples were collected from alongside upper streams that flow into Lake. LC degrading bacterial strains were isolated and identified as Bacillus aryabhattai and Bacillus circulans. COD was used as a parameter for measuring % the removal of LC at different intervals. Bacillus aryabhattai showed % removal of ۵۵% whereas, Bacillus circulans showed a % removal of ۸۳% in Minimal Salt Media after ۷۲ hours. This study revealed that Bacillus circulans may tolerate LC more effectively at higher concentrations and therefore may be used as potential hydrolyzing enzymes that may disrupt chemical bonds of pyrethroid and result in the reduction of toxicity. This work exhibited a promising approach for the bioremediation of LC and may hence be used as environmental bioremediations of other pyrethroids as well.Synthetic pyrethroids are widely used for the improvement of crop production but are also regarded as potentially harmful pollutants. The present study aimed to evaluate the efficiency of different indigenous soil bacteria to degrade Lambda Cyhalothrin (LC), a known synthetic pyrethroid. The sampling area was selected as Rawal Lake and soil samples were collected from alongside upper streams that flow into Lake. LC degrading bacterial strains were isolated and identified as Bacillus aryabhattai and Bacillus circulans. COD was used as a parameter for measuring % the removal of LC at different intervals. Bacillus aryabhattai showed % removal of ۵۵% whereas, Bacillus circulans showed a % removal of ۸۳% in Minimal Salt Media after ۷۲ hours. This study revealed that Bacillus circulans may tolerate LC more effectively at higher concentrations and therefore may be used as potential hydrolyzing enzymes that may disrupt chemical bonds of pyrethroid and result in the reduction of toxicity. This work exhibited a promising approach for the bioremediation of LC and may hence be used as environmental bioremediations of other pyrethroids as well.

Bioremediation, Lambda cyhalothrin, Minimal salt medium, Optical density, Pyrethroids, Pesticide