The intent of this research was to discofver how the accumulation of dissoved solids found in deinkign mill waters contributes to inefficient flotation deinkign of old newsprint.In the first phase,water from laboratory flotation trials was reused several time sto examine the rate at which dissolved solids reach a concentration which impacts deinkign efficiency.Phase two was a ocntaminant study where dissolved dsolids arising from the deinking process wer eadded to the flotation cell individually to determine the reaction of the systme to the build up of each separate chemical.The final phase then examined the chemcials added together at different concentratiosn.In each phase,flotation deinking efficiency was evaluated by brigntness tests,effective residual ink concentraiton (ERIC) values,and reject analysis.Tensile strength properties were also examined in the ocntaminant trials.
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