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Papermaking Water Treatment – Improve Process Water Quality

The machines are producing papers.
Why Need?

Why is water quality so important to the papermaking industry?

The papermaking industry puts strict requirements on water quality in its production and processing processes. The turbidity and color of water directly affect the production and bleaching effect of paper, while excessive iron and manganese ions in water can result in white paper becoming yellow easily. Additionally, water alkalinity reflects its pH value, which in turn affects the optimal pulp ratio during papermaking. Therefore, maintaining good water quality is crucial throughout the entire production process.

The papermaking industry is a highly wastewater-intensive industry. For many paper mills, wastewater treatment is a challenging issue. During the production, the pulping and papermaking processes generate a significant amount of wastewater containing harmful substances such as lignin, hemicellulose, sugars, residual alkali, inorganic salts, volatile acids, and organic chlorides. This wastewater features large discharge volume, high chemical oxygen demand (COD), significant pH variations, high coloration, and sulfide-like foul smells, making it difficult to deal with industrial wastewater. If directly discharged into the environment, it will cause severe pollution. Therefore, the papermaking industry should adopt water treatment processes to purify wastewater, meet discharge standards, or achieve water reuse.

Where Need?

What Process Need To Be Treated?

Pulp washing

Paper washing

The worker is conducting papermaking.


Wastewater treatment

Wastewater treatment


How can we help?

  • Flocculation and sedimentation system: settle and remove fibrous suspended solids impurities from wastewater;
  • Multimedia filter system: for removing iron and manganese ions from water;
  • Activated carbon filter system: for absorbing color impurities in water and reducing the impact of pigments on paper making;
  • Softening system: for removing calcium and magnesium ions, reducing water hardness, avoiding too high hardness in the wastewater in post procedures, and forming pipe scale on the evaporator wall of alkali recovery;
  • Dosing system: for removing various impurity ions in wastewater to achieve water reuse; PH regulator to stabilize the acidity and alkalinity of the water;
  • Ultrafiltration system: for reducing the concentration of ions in wastewater and realizing zero discharge;
  • Reverse osmosis system: wastewater recycling to remove harmful ions in water, reduce the concentration value of BOD, and realize water reuse;

What goals can we help to achieve?

  • Improve the toughness and smoothness of finished paper.
  • Remove impurity particles and pigments from the water during pulping.
  • Improve the efficiency of papermaking.
  • Realize wastewater reuse.
  • Meet industry discharge standards.
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If you want to design or enhance your water treatment system, or if you have any problems during water treatment in your industries, we will help you.