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Pollutant <br />Reported Range of Anaerobic <br />Digestion Inhibition Threshold <br />Levels, mg/L <br />References* <br />METALS/NONMETAL INORGANICS <br />Ammonia <br />1500-8000 <br />(4) <br />Arsenic <br />1.6 <br />(1) <br />Cadmium <br />20 <br />(3) <br />Chromium (III) <br />130 <br />(3) <br />Chromium (VI) <br />110 <br />(3) <br />Copper <br />40 <br />(3) <br />Cyanide <br />4-100 <br />1 - 4 <br />(1) <br />(2),(3) <br />Lead <br />340 <br />(3) <br />Nickel <br />10 <br />136 <br />(2),(3) <br />(1) <br />Silver <br />13 - 65** <br />(3) <br />Sulfate <br />500-1000 <br />(4) <br />Sulfide <br />50-100 <br />(4) <br />Zinc <br />400 <br />(3) <br />ORGANICS <br />Acrylonitrile <br />5 <br />5 <br />(3) <br />(2) <br />Carbon Tetrachloride <br />2.9-159.4 <br />10-20 <br />2.0 <br />(1) <br />(3) <br />(2) <br />Chlorobenzene <br />0.96-3 <br />0.96 <br />(1) <br />(2) <br />Chloroform <br />1 <br />5-16 <br />10-16 <br />(2) <br />(1) <br />(3) <br />1,2 -Dichlorobenzene <br />0.23-3.8 <br />0.23 <br />(1) <br />(2) <br />1,4 -Dichlorobenzene <br />1.4-5.3 <br />1.4 <br />(1) <br />(2) <br />Methyl chloride <br />3.3-536.4 <br />100 <br />(1) <br />(2 ) <br />Pentachlorophenol <br />0.2 <br />0.2- 1.8 <br />(2) <br />(1) <br />Tetrachloroethylene <br />20 <br />(2) <br />Trichloroethylene <br />1 -20 <br />20 <br />20 <br />(1) <br />(2) <br />(3) <br />Trichlorofluoromethane <br />- <br />(2) <br />* Total pollutant inhibition levels, unless otherwise indicated. <br />* * Dissolved metal inhibition levels. <br />(1) Jenkins, D.I., and Associates. 1984. Impact of Toxics on Treatment Literature Review. <br />G-3 <br />