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• Positive values indicate a Zn concentration in bioreactor effluent water is less than <br />Colorado Gulch influent water. <br />Cell 5 was the control were municipal drii~lcing water was used. <br />NS =Not Sampled <br />Table 2. Manganese Removal from Colorado Gulch Water (Total Recoverable) <br /> Week <br />Cell 1 2 3 4 5 6 7 8 <br />1 -4,760% -145% -967% -929% -700% -612% -182% NS <br />2 -4,835% -1,058% -777% -1,303% -609% -559% -460% -394% <br />3 -3,577% -1,017% -530% -568% -471% -489% -315% -272% <br />4 -3,223% -717% -380% -488% -348% -279% -240% -260% <br />5 -3,287% -675% -649% -848% -240% -241% -115% -71% <br />Notes: <br />• Negative values indicate a Mil concentration in bioreactor effluent water is greater <br />than Colorado Gulch influent water. <br />• Positive values indicate a Mn concentration in bioreactor effluent water is less <br />than Colorado Gulch influent water. <br />• Cell 5 was the control were municipal drinl~ing water was used. <br />• NS =Not Sampled <br />Conductivity (Fig. 1), pH (Fig. 3), Oxidation-Reduction Potential (Fig. 4), Total <br />Dissolved Solids (TDS), and Temperature were measured on a daily basis to monitor <br />chemical conditions of each cell after 20 days of incubation. Ili addition, Colorado Gulch <br />and the drinking water were also measured to account for changes in water chemistry. <br />Results for Conductivity show an iiutial high value which is likely due to a high <br />residence time during the 20 day incubation period for which there is was no flow <br />through the cells. Therefore, dissolution of substrate material is likely the cause of the <br />elevated conductivity readings. Oxidation-Reduction Potential or Redox levels remained <br />below OmV for a majority of the bench test period indicating that a reducing environment <br />existed in each cell There were some anomalous readings where redox was >OmV but <br />for short periods of time or may have been an error in the instnulient. As expected, the <br />bioreactors added allcalinity, mainly from dissolution of the CaC03, throughout the test <br />period. <br />Results for the dissolved and total recoverable fractions for zinc and manganese are <br />shown in Figures 4 - 7. All cells showed at least a 50% removal of zinc (total recoverable <br />fraction) from Colorado Gulch influent water. Manganese, however, had elevated levels <br />when compared to Colorado Gulch influent for the duration of the bench test which <br />5 <br />