Using Novel DNA Methods to Achieve Higher Process Efficiency and Performance, TAPPICon22

Uncontrolled microbiological activity is a challenge for RCF (recycled fiber) mills as it can have negative effects on production and end-product quality. The microbes that exist in these systems have been largely unknown, and the strategies employed to control microbiology have been non-specific. Understanding the specific microbial groups present in RCF mills, their properties, where they exist, and having the ability to accurately measure the true troublemakers, is the key to targeted control of the bad actors. We present results of a global survey of over 40 RCF machines. The same RCF-specific problem-causing bacterial groups were found on different continents, including large densities of newly identified bacteria in paper processes. Those can degrade cellulose and starch, produce acids and odorous substances, and can have a significant impact on fiber strength and additive consumption. We also demonstrate how modern DNA tools can quantify the impact of biocidal countermeasures against the actual troublemakers – including bacteria found to degrade cellulose during RCF pulp storage, which may be linked to a negative impact on end-product strength. These novel DNA tools give producers updated biocide program KPIs and actionable information to more effectively design and adjust microbiological control to achieve higher process efficiency and performance.

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