Water is increasingly becoming a limited resource. Constant efforts are therefore being made by paper and card producers to reduce the need for fresh water even further. The water from all stages of production is passed through many 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 cause problems. Here, too, you can rely on our wide experience. We can support you with our skill in deposit control of process waters.
To keep the process clean, prior microbiological treatment of the incoming fresh water is crucial. Any microbes present at this stage act as a perfect starter for contamination or slime formation in later stages of the process, e.g. in spraying tubes or in additive preparation as a result of dilution with contaminated water.
This applies equally 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 to treat 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. Continual treatment against calcium deposits is also needed in seal water for vacuum pumps, for example, to ensure that they can operate at maximal efficiency.
