MANTECH Presents at PAPTAC Spring 2018 Bleaching Committee Meeting

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MANTECH Presents at Pulp and Paper Technical Association of Canada (PAPTAC) Spring 2018 Bleaching Committee Meeting

MANTECH was invited to present at the 2018 PAPTAC Bleaching Committee Meeting in Edmundston, New Brunswick.  The committee meets twice annually to discuss challenges, solutions, and emerging technologies for bleaching process optimization in pulp and paper mills.

This meeting featured a presentation from one of MANTECH’s Environmental EITs, Maggie Grierson.  She presented a case study from a Chilean pulp mill that used the peCOD technology for bleaching process savings.  The mill was searching for a faster chemical oxygen demand (COD) test to improve their bleaching process efficiency and to reduce excess bleaching chemical consumption.  The COD concentration of wash water carried to the bleaching process is significant because it determines the required amount of bleaching chemical.  Wash water with higher COD concentrations can result in consumption of bleaching chemical.  Therefore, excess chemical must be added to compensate for this loss.

Prior to having a fast COD test, operators relied on a 7-hour Scandinavian Standard method, SCAN-C 45:00.  The SCAN test required sample collection, drying, and COD measurement by dichromate method, to obtain the COD result.  Due to the hazardous chemicals required for the dichromate method, the test was only performed by laboratory technicians.  Combined with the long analysis time, operators did not receive timely data to monitor the wash water or accurately dose the bleaching chemical.

After implementing the peCOD method for COD analysis, operators were able to run wash water analyses and receive the COD results in under 15 minutes.  The rapid peCOD analysis time improved efficiency within the bleaching process and created big savings in chemical costs.  The reduction of COD in wash water was achieved by fast and frequent COD monitoring, which allowed operators to make real-time decisions, and reduce the frequency of “high COD events”.  This resulted in optimization of the pulping process, reduction in bleaching chemical use, and savings in chemical and energy costs.

For more information, download the full power-point presentation Spring 2018 Bleaching Committee Meeting.


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