High Pulp Yield Measurement through Chemical Oxygen Demand of Effluents

摘要

Accurate measurement of pulp yield has always been a problem particularly with mechanical and chemimechanical pulping processes. Measurement of the yield, based on the dry weight of chips prior to processing, will not be accurate enough due to variation in the moisture content of the chips and the difficulty of representative sampling for moisture estimation. In the present investigation COD measurement of the effluent was employed to calculate the loss in yield during the process of pulping. A linear relationship between COD and dissolved solids (organics) was found to exist. The accuracy of the method was much dependent on the uniformity of sampling of pulping effluents.