Effects of Esterase on the Behavioral Characteristics of Microstickies in Whitewater of Recycled Pulp, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings
This study investigated the effects of esterase on the microstickies in whitewater of pulp from mixed office paper (MOP) by using a modified flow cytometry, which can effectively capture the information of the microstickies particles in micron level. The results shows esterase can observably degrade the microstickies in whitewater into smaller particles. However, these generated microstickies gathered into large size particles almost at the same time. Moreover, the dosage and the application time of esterase will have an effect on the degree of agglomeration and dispersion of microstickies. When this enzyme dosage reached 20‐60 U/L, the gather tendency of microstickies was dominant. And with the time continued, the agglomeration of microstickies increased. Via measuring the conductivity and cationic demand of the whitewater system, it can be found that the physicochemical characteristics on the surface of these small particles changed and the whole system need to reach a new balance. This work can explain the role of esterase on microstickies and can supply a reference for the application of enzyme in papermaking.
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