Biosorption of Malathion by dry cells of an isolated Bacillus sp. S₁₄

Abstract

The removal of Malathion, a moderately toxic organophosphate pesticide causing environmental pollution, from dilute aqueous solutions was studied. The experimental results showed that the dry cells of Bacillus sp. S 14 were effective in removing Malathion from solution. Biosorption equilibrium was attained within 6 h. Maximum biosorption of Malathion (81.4%) was observed under the following environmental conditions, pH 6.5, temperature 25 C, dry biomass concentration 1 g L À 1 at 6 h. Both Langmuir and Freundlich isotherms were tested and the latter had a better fit with the data. The dried powdered cells of Bacillus sp. S 14 can be safely stored for 60 days at room temperature without any loss of biosorption efficiency. The results suggest that the dry cells of the isolated Bacillus sp. S 14 can be used as a biosorbent for an efficient removal of Malathion from aqueous solutions.

Biosorption of Malathion using dry cells of Bacillus species S14 in a packed bed column reactor

“…Malathion (99.9% purity) was procured from Bayer Crop Protection Department, India. In the present study, a bacterial strain Bacillus sp S 14 (Adhikari et al, 2010) was used. The organism was maintained by monthly sub culturing in nutrient agar medium at 30 °C for 24 h then stored in the refrigerator at 4 °C.…”

“…The effective height of the column was varied ( range 3-6 cm ). The pH of the inlet fluid was 6.5 (Adhikari et al, 2010).…”

Biosorption of Malathion by immobilized cells ofBacillussp. S14

“…S 14 isolated and identified in our laboratory according to Bergey's Manual of Determinative Bacteriology, 1994 (Adhikari et al, 2010) was used in the present study and maintained by monthly subculturing using nutrient agar at 30 C for 24 h and stored at 4 C.…”

Kinetic Study of Malathion Biosorption Using Dry Cells of an Isolated Bacillus sp. S14

“…Because pesticides are being used more frequently to boost agricultural output, it is becoming more and more important to remove pesticide residue from the environment. The influents, effluents, and sludge of biological wastewater treatment plants in North America have been found to include a variety of harmful chemicals [2]. Malathion is an organophosphate insecticide that is used to kill insects on agricultural crops and stored products, as well as in gardens and other outdoor places where trees and shrubs are grown.…”