The sewers of an integrated paper mill in the Southeastern U.S. were analyzed for resin and fatty acids (RFAs) andthe process parameters of temperature, pH, and flow rate were measured. Two sources were found to contributeapproximately 30% of the total RFA load to primary treatment. These sewer streams were then used in laboratoryflotation studies to examine resin and fatty acid removal efficiency. RFA concentration was removed by 30%, onaverage, and two mechanisms were determined. RFAs partitioned to total suspended solids (TSS) and were removedby solids concentration in the foam. Foam concentrates were between 0.4 and 0.8 %, on a volume basis. This paperfocuses on the removal of RFAs attached to suspended solids. In addition, a kinetic model for solids removal wasapplied for the bubbly flow regime, and predictions were compared to experimental results.
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