Polyaluminum chloride (PAC) is widely used in the papermaking industry, mainly as a coagulant and flocculant:
Coagulation and flocculation: PAC, as a coagulant, can effectively aggregate small particles suspended in papermaking wastewater into larger condensates for subsequent separation and removal. This helps to purify wastewater, reduce suspended solids content, and improve water transparency.
Suspended solids removal: PAC helps to remove suspended solids, sediment, and other impurities from papermaking wastewater. This can reduce the impact of wastewater discharge on the environment and improve the treatment efficiency of wastewater.
PH regulation: PAC can also be used as a pH regulator to help maintain an appropriate pH level during the papermaking process. This is very important for the specific chemical reactions in some paper production processes.
Clarification tank treatment: In the wastewater treatment system of a paper mill, PAC can be added to the clarification tank to promote the settling of suspended solids, reduce the production of sludge, and thus improve the efficiency of wastewater treatment.
Improving paper quality: The use of PAC is not only beneficial in wastewater treatment, but can also be used in the clarification and flocculation process of pulp, which helps to improve the quality of paper.
When using PAC, it is necessary to determine the appropriate dosage and usage method based on the specific papermaking process and water quality. In addition, ensure compliance with environmental regulations and regularly monitor the quality of wastewater to ensure treatment effectiveness and compliance with relevant standards.
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