Inhibitory Effects of Titanium Dioxide, Silver and Fullerene Nanoparticles on Activated Sludge from a Municipal Wastewater Treatment Plant

摘要

The possibility of negative impacts of three nanomaterials on activated sludge was investigated through respiration inhibition tests following a modified OECD 209 protocol. Titanium dioxide, silver and fullerene nanoparticles were considered. A silver salt was also used as a known toxic and as a basis for comparison with the nanoparticle form. Activated sludge was obtained from a municipal wastewater treatment plant. All materials tested showed respiration inhibition when present at concentrations between 10 mg/1 and 100 mg/1, although ionic silver resulted significantly more toxic with an IC_(50) below 5 mg/1.