New Total Solids Measurements Help Optimize Pulp And Paper Industry Wastewater Treatment, 2021 TAPPICon Live (21TAPL)

The pulp and paper industry is one of the most closely regulated and controlled industries in the world with allowable environmental limits requiring best available technology (BAT) for process measurements and control. For water protection, effective wastewater treatment and the recovery of harmful substances is of paramount importance but traditionally, because of the lack of reliable and accurate measurements, the only way to manage the wastewater treatment process has been laboratory analysis which makes automated control actions impossible. The large volumes of wastewater, low solids content and contamination of measuring devices create special challenges for reliable real-time measurements. Newly developed measurement technologies to address these challenges now provide real-time process values in the extreme conditions of the effluent treatment plant. Treatment efficiency can be increased by knowing the sludge amounts, from a few parts per million to tens of percent, in the different process phases. The efficient utilization of these new measurement results are used to optimize pumping energy and chemical additions as well as minimizing wasteful solids recirculation inside the treatment plant and maximizing the solid content in the dewatered sludge to optimize incineration costs. 

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