Record Display for the EPA National Library Catalog
RECORD NUMBER: 45 OF 56| Main Title | Studies on the Influence of Chromium Compounds on the Biological Treatment of Effluent in the Presence of Tannery Effluent (Untersuchungen Ueber den Einfluss von Chromverbindungen auf die Biologische Abwasserbehandlung in Gegenwart von Gerbereiabwasser). | |||||||||||
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| Author | Koenigfeld., G. ; | |||||||||||
| CORP Author | Environmental Protection Agency, Research Triangle Park, N.C. Translation Services Section. | |||||||||||
| Year Published | 1973 | |||||||||||
| Report Number | EPA-TR-75-220; | |||||||||||
| Stock Number | PB-252 747-T | |||||||||||
| Additional Subjects | Bacteria ; Chromium inorganic compounds ; Industrial waste treatment ; Activated sludge process ; Tanning materials ; Waste water ; Concentration(Composition) ; Sludge digestion ; Aerobic processes ; Translations ; West Germany ; Toxicity ; Water pollution control ; Leather industry ; Poisons ; Biological industrial waste treatment ; Water pollution effects(Plants) | |||||||||||
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| Collation | 50p | |||||||||||
| Abstract | The objective of the studies was to determine the concentrations at which chromium compounds contained in tannery effluents would have detrimental effects on biological sewage treatment in the activated sludge and anerobic digestion processes. It was found that in the normal operating range of an activated sludge plant (pH 7.0-8.5), the chromium concentration can be increased to at least 500 mg Cr (III)/l effluent without any detrimental biological effects. In a properly designed anerobic digester plant, the concentration can be at least 3200 mg Cr (III)/l sludge (in the form of the oxide) without interfering with the biology. |