Nitrification inhibition by silver nanoparticles

摘要

Nitrification inhibition by silver nanoparticles (nanosilver) was evaluated by extant respirometrynusing enriched nitrifying bacteria isolated from wastewater treatment plants. Silver nanoparticlesnwere more toxic than silver ions or silver chloride colloids, all of which did not disrupt cellnmembrane integrity at 1mg/L Ag. The toxicity of silver nanoparticles was reduced in the presencenof various anions, especially sulfide. The results suggest that silver nanoparticles have the samenbehaviour of surface complexation as silver ions, and inhibition by nanosilver in wastewaterntreatment may be removed by reaction of silver nanoparticles with soluble sulfide species.