Paper mill pulping wastewater refers to the cooking waste liquid (also known as black liquor, red liquor) produced by chemical pulping, the middle water produced in the washing and bleaching process and the white water produced in the papermaking process, which are all serious to the environment Pollution.

Generally, 1 ton of organic matter and 400 kg of alkalis and sulfides are dissolved in the black liquor for every 1 ton of sulphate pulp produced; about 900 kg of organic matter and 200 kg of oxides (calcium, magnesium, etc.) are produced for 1 ton of sulfite pulp. And sulfide is dissolved in red liquor. The discharge of waste liquid into rivers not only seriously pollutes the water source, but also causes a lot of waste of resources. How to eliminate the pollution of papermaking wastewater and make use of the valuable resources in the waste liquid is a work of great social significance and economic value and should be paid attention to.

Polyacrylamide for pulping wastewater treatment in paper mills

The wastewater discharged from the pulping and papermaking process is generally divided into pulping wastewater, kraft pulp wastewater and semi-chemical paper wastewater; its main pollutants are:

1. Suspended matter: mainly fibers and fiber fine materials;

2. Yibiology explains organic matter: mainly low molecular weight hemicellulose, methanol, acetic acid, sugars, etc.;

3. Refractory organic matter: mainly lignin and macromolecular carbohydrates contained in fiber raw materials;

4. Acid-base substances.

At present, the more mature papermaking wastewater treatment method is the alkali recovery method, but the high cost makes it unaffordable for small and medium-sized paper companies. According to the actual situation of the paper mill, the acidification-UBF-coagulation method has been adopted to treat wastewater with good results.

Water treatment generally uses inorganic flocculants (aluminum sulfate, etc.) in conjunction with anionic polyacrylamide. Cationic polyacrylamide is generally used for sludge dewatering.

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