Water is increasingly becoming a limited resource. Constant efforts are therefore being made by paper and board producers to reduce the need for fresh water even further. The water from all stages of production is passed through a series of filtering and purifying steps and then fed back into the process again whenever possible (and depending on specifications).
However, deposits and microbial contamination of the various forms of process water often causes problems. You can also rely on our extensive experience in this area. We can support you with our expertise in the deposit control of process waters.
In order to keep the process clean, it is essential for the incoming fresh water to undergo microbiological treatment. Any microbes present at this stage act as a perfect trigger for contamination or slime formation in later stages of the process, e.g. in spray bars or in additive preparation as a result of any dilution with contaminated water.
This applies to any points in the process at which fresh water can be replaced either with clear or super-clear filtrate or with recycled water from an integrated purification plant. Microbiological control improves the hygiene of the paper machine but it is also important in the treatment of cooling water, for example. Microbial growth here can result in slime formation, calcium deposits and corrosion which, in turn, lead to poor heat transfer and increased maintenance costs. Ongoing treatment against calcium deposits is also needed in sealing water for vacuum pumps, for example, to ensure that they can operate at maximum efficiency.
