摘要：Effect of various heavy metals was examined by experimental purification with activated sludge process using an artificial waste water. Presence of some heavy metals in the drainage water showed distinct obstacle on progress in the treatment. Especially, the chemical oxygen demand removal rate was decreased by the addition of Hg2+, Cu2+, and Ni2+, but Zn2+ and Pb2+ did not show a marked effect at the tested concentration of 1 to 40 ppm. Effect of heavy metals on the reduction activity of triphenyltetrazolium chloride (TTC) on activated sludge was similar to the above results, and Pb2+ showed little or no inhibition at 40 ppm. It was found that TTC reduction with dehydrogenase activity of Zoogloea and Sphaerotilus was largely inhibited by 2×10-5M of Hg2+ (4.01 ppm) or Cu2+ (1.27 ppm). From these results, measurement of TTC reduction rate by dehydrogenase activity of activated sludge or Zoogloea was considered to be valuable as an index of purification-inhibition by influent of inhibitors such as heavy metals.
关键词：activated sludge;COD removal rate;heavy metal ion;succinate dehydrogenase;citrate dehydrogenase;artificial waste;TTC reduction;Zoogloea;Sphaerotilus
