White water in the papermaking process is the water used to flush and rinse out excess fiber material, chemicals, and other impurities from the paper machine after the paper has been formed. This water can contain a variety of substances, including fibers, soluble organic matter, particles, chemicals used in the process (such as bleaching agents, fillers, surface treatment chemicals), and any pollutants present in the recycled paper.
Since white water can contain chemicals and pollutants, it must be treated before being discharged into the sewer or reused. Various methods of water treatment are used to remove or reduce the concentration of pollutants and to recycle water and chemicals for reuse in the process. These methods may include mechanical filtration, chemical treatment, desalination, and biological degradation of organic matter. By effectively managing and treating white water, paper mills can reduce their environmental impact and achieve sustainability in their production process.
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