Atrazine degradation by bioaugmented sediment from constructed wetlands.

摘要: The potential to establish pesticide biodegradation in constructed wetland sediment was investigated. Under microcosm conditions, bioaugmentation of with small quantities an atrazine spill-site soil (1:100 w/w) resulted the mineralization 25–30% 14C ethyl (1–10 µg g–1 sediment) as 14CO2 under both unsaturated and water-saturated conditions; its common metabolites were almost undetectable after 30 days incubation. By comparison, unbioaugmented supplemented organic amendments (cellulose or cattail leaves) mineralized only 2–3% atrazine, extractable comprised approximately 70% original application. population density atrazine-degrading microorganisms increased from ~102/g 104/g by w/w), another 60-fold (6.0×105 g–1) incubation 10 atrazine. A high degraders (~106 enhanced rates also developed bioaugmented flooded mesocosms planted cattails (Typha latifolia) (3.2 mg l–1, 1 sediment). In absence neither degraders, nor mineralizing increased, regardless presence cattails. Bioaugmentation might be a simple method promote degradation nursery run-off channeled through wetlands, if persistence is not serious constraint.