Long-Term Effects of Chromium and Copper on the Rotating Biological Contactor

摘要

This laboratory investigation studied the long-term effect of hexavalent chromium and divalent copper. Different concentrations of chromium (1mg/l, 5mg/l, and 10mg/l) and copper (3mg/l and 10mg/l) were used at each concentration. COD, TOC, and BOD tests were run. During each day these tests were run, the amount of these metallic ions was measured in the influent and effluent. This investigation found that the effect of chromium is not a function of time, and the results of the first and last day are the same. However, 10mg/l chromium concentration did upset the system, but chromium removal was as high as 1mg/l and 5mg/l. This investigation also found that the effect of copper on rotating biological contactors is not a function of time. Although a high copper removal was obtained, 10mg/l copper concentration deteriorated the system completely, and the sludge was black during the period of analysis for this concentration.