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Pollutant Reported Range of Trickling Filter References* <br />Inhibition Threshold Levels, mg/L <br />Chromium (III) 3.5-67.6 (1) <br />Cyanide 30 1 <br />Pollutant <br />Reported Range of Activated Sludge <br />References* <br />Pollutant <br />Inhibition Threshold <br />References* <br />(2) <br />Levels, mg/L <br />5.2 <br />Pentachlorophenol <br />0.95 <br />(2) <br />(4) <br />50 <br />(3) <br />(1) <br />75-150 <br />(1) <br />Phenanthrene <br />500 <br />(1) <br />(2), (3) <br />500 <br />(2) <br />Phenol <br />50-200 <br />(3) <br />(2), (3) <br />200 <br />(2) <br />(2), (3) <br />(1) <br />200 <br />(1) <br />Toluene <br />200 <br />(3) <br />2,4,6 Trichlorophenol <br />50- 100 <br />(1) <br />Surfactants <br />100- 500 <br />4 <br />Pollutant Reported Range of Trickling Filter References* <br />Inhibition Threshold Levels, mg/L <br />Chromium (III) 3.5-67.6 (1) <br />Cyanide 30 1 <br />Pollutant <br />Reported Range of Nitrification <br />Inhibition Threshold Levels, mg/L <br />References* <br />METALS/NONMETAL INORGANICS <br />Arsenic <br />1.5 <br />(2) <br />Cadmium <br />5.2 <br />(1),(2) <br />Chloride <br />180 <br />(4) <br />Chromium (VI) <br />1 - 10 [as (CrO4 )2-] <br />(1) <br />Chromium (T) <br />0.25-1.9 <br />1 -100 <br />(trickling filter) <br />(1), (2), (3) <br />(1) <br />Copper <br />0.05-0.48 <br />(2), (3) <br />Cyanide <br />0.34-0.5 <br />(2), (3) <br />Lead <br />0.5 <br />(2), (3) <br />Nickel <br />0.25-0.5 <br />5 <br />(2), (3) <br />(1) <br />Zinc <br />0.08-0.5 <br />(2),(3) <br />ORGANICS <br />Chloroform 10 (2) <br />2,4-Dichlorophenol 64 (3) <br />2,4-Dinitrophenol 150 (2) <br />Phenol 4 (2) <br />4-10 3 <br />G-2 <br />