Papermaking wastewater mainly comes from the two production processes of pulping and papermaking in the papermaking industry. The wastewater produced by pulping is the most polluted. The wastewater discharged during pulp washing is dark brown, which is called black water. The concentration of pollutants in black water is very high, the BOD is as high as 5-40g/L, and it contains a lot of fibers, inorganic salts and pigments. The wastewater discharged from the bleaching process also contains a large amount of acid and alkali substances.
The waste water from paper machines, known as white water, contains a lot of fibers and fillers and sizing materials added during the production process.
The treatment of paper industry wastewater should focus on improving the recycling water rate, reducing water consumption and wastewater discharge, and at the same time actively exploring various reliable, economical and efficient treatment methods that can fully utilize the useful resources in wastewater.
We use Ro ,UF system can decrease the pollution of this industry.
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