Problem Summary

Strong oxidizing biocides, such as bleach, chlorine dioxide, and hypobromous acid, are commonly used to control microorganisms in alkaline papermaking systems.  However, paper streams contain many substances that consume oxidizers (e.g., fiber and starch).  Therefore, to achieve effective microbiological control, the oxidizer must be overdosed to overcome the effect of these substances.  When dosed in this manner, the oxidizer can increase corrosion rates on the paper machine, resulting in costly equipment repair or replacement.

Recommended Solution

Spectrum® Ammonium Bromide Technology is a new, patented biocide that effectively controls microorganisms in alkaline papermaking systems while minimizing oxidizer-related corrosion.  The biocide, which is produced onsite by blending ammonium bromide, sodium hypochlorite, and mill fresh water, can be applied in a continuous or intermittent fashion, depending on the specific system.  Because the biocide does not react with fiber, it can be added not only to white water systems but also to thick stock, such as broke and recycled fiber.

Key benefits recorded from practical applications of Spectrum® Ammonium Bromide Technology include:

Reduced sheet breaks
Reduced sheet defects
Increased time between boilouts
Reduced washups
Reduced corrosion rates
Reduced consumption of costly wet end additives
Reduced felt degradation
Reduced halogenated organic compounds
Reduced biocide usage, which keeps program costs affordable
No negative effect on activated sludge plants (even at addition rates 10 times higher than recommended)