Laserfiche WebLink
Table 5-6. Shutdown Recovery Test Results <br />Filter <br />No. <br />Contaminant <br />Pre -Shutdown <br />Conc. m /L <br />( 9 ) <br />Post Shutdown Conc. (mg/L) <br />Target Effluent <br />Conc. m /L <br />( g ) <br />30-min <br />1-hour <br />2-hour <br />24-hour <br />Iron <br />0.01 <br />0.01 <br />N/A <br />N/A <br />N/A <br />0.30 <br />1 <br />Manganese <br />0.017 <br />0.092 <br />0.023 <br />0.022 <br />0.026 <br />0.050 <br />Ammonia <br />0.02 <br />0.10 <br />0.07 <br />0.06 <br />0.01 <br />0.20 <br />Iron <br />0.01 <br />0.02 <br />0.01 <br />N/A <br />N/A <br />0.30 <br />2 <br />Manganese <br />0.015 <br />0.087 <br />0.025 <br />0.027 <br />0.022 <br />0.050 <br />Ammonia <br />0.02 <br />0.12 <br />0.09 <br />0.11 <br />0.04 <br />0.20 <br />All post shutdown concentrations for Filter 1 were below the target effluent concentrations set for <br />this pilot study within 1 hour of re -starting the filter. The pre shutdown manganese concentration <br />was not recovered within 24 hours of the re -startup. This is not a concern as the effluent manganese <br />concentration was below the MDH guidance value for infants within 30 minutes of filter startup. <br />All post shutdown concentrations for Filter 2 were below the target effluent concentrations set for <br />this pilot study within 1 hour of re -starting the filter. The pre shutdown ammonia and manganese <br />concentrations were not recovered within 24 hours of the re -startup. This is not a concern as the <br />effluent manganese concentration was below the MDH guidance value for infants within 30 minutes <br />of filter startup and the effluent ammonia concentration was maintained below the target treated <br />goal following the shutdown period. <br />Water Treatment Pilot Study Report <br />Biological Removal of Ammonia, Iron and Manganese at Well House No. 6 <br />City of Lino Lakes, MN <br />WSB Project No. 018601-000 <br />Page 14 <br />