Inhibition of Nitrification by Chromium in a Biodisc System,
MCNAMEE PORTER AND SEELEY ANN ARBOR MI
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A series of investigations was undertaken to determine the acceptability of certain industrial wastes containing hexavalent chromium by a biodisc system providing both secondary treatment and biological nitrification. The initial objectives of the study were to determine the extent to which a biodisc system can tolerate chromium VI without losing efficiency in either BOD removal or in nitrification to establish mechanisms of chromium removal and the benefits of staging, and to understand differences in short and long-term effects and steady state or shock load conditions. These objectives were established to serve a number of purposes. The data gathered will assist municipalities in determining the quantity and characteristics of chromium containing waste that may be accepted without causing interference in operation. The data gathered will also assist design engineers in understanding and better defining the process reliability between an activated sludge and a biodisc system and finally the benefits of staging in an RBC.