10.22376/ijpbs.2019.10.1.p1-12 Volume 2 Issue 3 2011 (July - September) In this study, chlorpyrifos degrading capability of four bacterial monocultures ( lessThan i greaterThan RCC-2, GCC-1, GCC-3 lessThan /i greaterThan and lessThan i greaterThan JCC-3 lessThan /i greaterThan ) and two bacterial mixed-cultures ( lessThan i greaterThan GCE345 lessThan /i greaterThan and lessThan i greaterThan GCC134 lessThan /i greaterThan ) was investigated in terms of treatment duration and culture volume, using soil slurry medium. Among the bacterial mono-cultures, lessThan i greaterThan RCC-2 lessThan /i greaterThan was found to be most efficient with 21, 37, 54 and 77% of chlorpyrifos degradation in 5, 10, 15 and 30 days of treatment duration, respectively. Out of two bacterial mixed-cultures, lessThan i greaterThan GCC134 lessThan /i greaterThan was more effective and resulted in 24, 38, 56 and 85% degradation of chlorpyrifos in 5, 10, 15 and 30 days of treatment, respectively. Chlorpyrifos degradation was higher by increasing the culture volume of respective bacterial cultures, from 10% to 25% (v/v), for 10 days of treatment at room temperature. The Pearson correlation between treatment duration and % degradation of chlorpyrifos were 0.953 and 0.988 with bacterial mono- and mixed-cultures, respectively. Sumit Kumar Bioremediation, Chlorpyrifos, Mono-cultures, Mixed-cultures, Degradation 359-366