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Composition of main pollutants in Papermaking Wastewater



Source: Papermaking wastewater treatment Author: admin Date: 2018-07-11 15:08 Browse:

       Papermaking wastewater It mainly comes from waste paper deinking, washing, slurry purification, screening, concentration and wet end of paper machine. In the pulping part, a large amount of washing wastewater is produced in the process of removing slag, washing slurry and rinsing. Some papermaking processes usually treat wastewater containing fibers, fillers and chemicals to recover and recover wastewater.

The main pollutants in papermaking wastewater are as follows:

 
1. Suspended solids include settleable suspended solids and non curable suspended solids, mainly fibers and fine fibers (i.e. broken fiber fragments and hybrid cells)
2。 Biodegradable organic compounds, including low molecular weight hemicellulose, methanol, acetic acid, formic acid, sugar, etc.
3. The refractory organic compounds mainly come from lignin and macromolecular carbohydrates in fiber materials.
4. Rosin acid and unsaturated fatty acid contained in black liquor.
The pH value of pulping wastewater is pH 10.2.
6. The color of residual lignin in chroma pulping wastewater is very high.


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