Virgin (Fe0) and microbially regenerated (Fe2+) iron turning waste for treating chlorinated pesticides in water

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Journal of Hazardous Materials



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This work investigated the applicability of iron turning waste as filtration media for treating mixture of organochlorine pesticides (OCPs) in water and the ability of non-pathogenic bacterium Shewanella oneidensis to regenerate the exhausted iron turning waste for reuse. In batch experiments, 1.5 x 10(4) mg/L of iron turning waste efficiently removed (>= 85%) five out of six pesticides in 200 mL of water (20 mu g/L for each pesticide) in 10 min. Increasing the iron dose from 2.5 x 10(3) to 1.5 x 10(4) mg/L enhanced the removal of heptachlor, endosulfan, dieldrin, and endrin by 5.7, 13.2, 23.3, and 39.4%, respectively, whereas lindane and dichlorodiphenyl trichloroethane removal was comparable when using 2.5 x 10(3) and 1.5 x 10(4) mg/L of iron. Better pesticide removal (except lindane) was achieved when the initial concentration of each pesticide was higher (20 mu g/L versus 1 mu g/L) in the solution. Acidic pH favored OCPs (except endosulfan) removal. S. oneidensis efficiently reduced 80 +/- 5% of dissolved ferric iron (Fe3+) to ferrous iron (Fe2+) in 72 h. Microbially regenerated Fe2+ iron removed all six OCPs in water efficiently (52-91%) and at similar levels as provided by virgin iron turning (38-100%). Lindane, endosulfan, and dieldrin removal increased 4-fold using S. oneidensis regenerated iron compared to exhausted iron.


Iron turning waste; Chlorinated pesticides; Water treatment; Microbial regeneration of iron


Civil and Environmental Engineering | Environmental Microbiology and Microbial Ecology | Life Sciences



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