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Papermaking wastewater treatment equipment
Basic equipment configuration:
Name: Papermaking wastewater treatment equipment
Sewage treatment capacity 10-200 (m3 / h)
Ozone consumption 54 (g / h)
Air volume 54 (m3 / min)
Air tank capacity 50 (m3)
Flowmeter specifications 210 (m3 / h)
Outlet pipe diameter 110 (mm)
Inlet pipe diameter 90 (mm)
Overall dimensions 1509 * 2410 * 1830 (cm)
Aerator power 20 (kw)
The paper industry uses wood, straw, reeds, rags, etc. as raw materials, and cellulose is separated by high-temperature and high-pressure cooking to make pulp. In the production process, the non-cellulosic part of the raw material is finally discharged into the papermaking black liquor. The black liquor contains lignin, cellulose, volatile organic acids, etc., which has an odor and is highly polluting.
Papermaking wastewater mainly comes from the two processes of pulping and papermaking in the paper industry. Pulp is the process of separating fibers from plant raw materials into pulp and then bleaching. This process will generate a large amount of papermaking wastewater. The process is also prone to papermaking wastewater.
Papermaking wastewater from pulping is the most polluted. The waste water discharged during washing is black-brown, which is called black water. The concentration of pollutants in black water is very high. The papermaking wastewater discharged from the bleaching process also contains a large amount of acid and alkali substances. The papermaking wastewater discharged by the papermaking machine is called white water, which contains a large amount of fiber and fillers and rubber added during the production process.
Papermaking wastewater treatment equipment should focus on improving the recycling water rate, reducing water consumption and wastewater discharge, and also actively exploring various reliable, economical and able to make full use of useful resources in wastewater wastewater treatment methods. For example, the flotation wastewater treatment method can recover fibrous solid matter in white water with a recovery rate of 95%, and the clarified water can be reused; the combustion wastewater treatment method can recover sodium hydroxide, sodium sulfide, sodium sulfate in black water and combined with organic matter Of other sodium salts. Neutralizing wastewater treatment method to adjust the pH value of wastewater; coagulation sedimentation or flotation method can remove suspended solids in wastewater; chemical precipitation method can decolorize; biological treatment method can remove BOD, which is more effective for kraft wastewater; wet oxidation method for treating sulfite pulp Wastewater is more successful.
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