How to treat the wastewater generated by papermaking machinery during the papermaking process
Published Time：
2025-03-11 14:43
Source：
Papermaking machinery and equipment use a large amount of water in the pulp and papermaking process.
Papermaking machinery produces a large amount of wastewater during the papermaking process. This wastewater mainly comes from pulping, stock preparation, and papermaking processes, and contains fine fibers, fillers, and additives. It is characterized by large water volume, high pollutant content, and poor biodegradability. To address this, paper mills typically employ a series of treatment processes to ensure that the wastewater meets discharge standards or can be reused.
First, a screen removes larger solid impurities from the wastewater to prevent clogging of subsequent treatment equipment. Then, a regulating tank is used for homogenization to stabilize the water quality and quantity. Following this, coagulation and sedimentation are employed, adding coagulants and flocculants to cause the fine particles and colloidal substances in the wastewater to agglomerate and settle out.
For organic matter that is difficult to biodegrade, advanced oxidation technologies such as ozonation and Fenton oxidation can be used to improve its biodegradability. Afterward, aerobic biological treatment (such as activated sludge and biofilm methods) and anaerobic biological treatment (such as UASB reactors) decompose the organic matter into harmless substances like carbon dioxide and water.
Finally, after filtration processes such as sand filtration and activated carbon filtration, and disinfection (such as UV disinfection or chlorine dioxide disinfection), further impurities and microorganisms are removed to ensure the water quality meets standards. Some of the treated water can also be reused in certain stages of the papermaking process, achieving water resource recycling.
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