Biodegradation of Cypermethrin by Pseudomonas in a batch activated sludge process

Abstract

ABSTRACT:The biodegradation of Cypermethrin (20 to 125 mg/L) in an effluent using batch activated sludge was studied. Degradation was found to occur to a great extent only in the presence of Pseudomonas (IES-Ps-1) culture. Under aerobic conditions using mechanical aerators, Cypermethrin (20 mg/L) was almost completely degraded in just over 48 h at ambient temperature. Further loading of organic compound in subsequent experiments demonstrated that IES-PS-1was capable to degrade 82 % Cypermethrin at 40 mg/L dose in approximately 48 h. When the concentration was increased to 80 mg/L, 50% degradation of this compound was observed. Over this time period the cells could utilize only 17 % of Cypermethrin when it was given 125 mg/L, respectively. These findings indicate that increased concentration of Cypermethrin has a marked effect on biodegradation performance of IES-Ps-1 with a modest increased in the duration of lag phase, but did not lead to complete inhibition or cell death. These results proved that IES-Ps-1 is responsible for Cypermethrin degradation. Such finding may be useful in designing a scale-up in situ or on-site hazardous waste bioremediation process for field application.

BOX-BEHNKEN EXPERIMENTAL DESIGN MEDIATED OPTIMIZATION OF AQUEOUS METHYLPARATHION BIODEGRADATION BY Pseudomonas aeruginosa mpd STRAIN

“…So, the organic loads in terms of these parameters may increase the removal of methylparathion from aqueous solution. It was noted that the removal of organic load in terms of COD was proportional to the disappearance of cypermethrin (Jilani and Khan, 2006). Similar correlations were also observed by Berchtold et al, (1995).…”

Phytotoxicity Effect of Spent Oil on Jatropha curcas Seedlings used in Soil Phytoremediation

“…Phytoremediation is an innovative technology that uses plants to remove environmental contaminants such as heavy metals and organic compounds (White et al, 2006;Jilani and Khan, 2006). It is a novel plant-based remediation technology applied to inorganic and organic contaminated soils, water and sediments all over the world which makes use of naturally occurring processes by which plants and their microbial rhizosphere fauna degrade and sequester organic and inorganic pollutants (Pradhan et al, 1998).…”

Germination and growth of six plant species on contaminated soil with spent oil

“…Utilizing plants to absorb, accumulate and detoxify contaminants in the growth substrate through physical, chemical or biological processes is a wide spread practice (eg. White, et al, 2006;Jilani and Khan, 2006). This technology has been applied to both organic and inorganic pollutants present in soil (solid substrate), water (liquid substrate) or the air (Ghosh and Singh, 2005).…”