Technical Bulletin No. 0566: Effects of Biologically Treated Bleached Kraft Mill Effluent on Cold Water Stream Productivity in Experimental Stream Channels – Fifth Progress Report

Large scale outdoor experimental streams were used in a series of effluent addition studies to determine the compatibility of biologically treated bleached kraft mill effluent with satisfactory production of salmonid fishes. Results are reported for 9 to 10 month studies at effluent concentrations representing from 0.5 to 2.0 mg/L of effluent BOD addition (1.3 to 5.1 percent effluent by volume) as well as for an extended 3.5 year study at 0.5 mg/L BOD addition (1.5 percent effluent by volume). The series of studies indicated a pattern of greater rainbow trout cumulative production and average weight in streams receiving effluent and better survival in the control streams.