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The pollution and environmental impact of paper mill wastewater have drawn increasing global attention. Paper wastewater contains high levels of lignin, cellulose, and other refractory organic compounds, resulting in high color and a large amount of suspended colloidal particles.
Poly Aluminum Chloride (PAC) is widely used as a highly efficient coagulant for pulp mill wastewater and paper industry effluent treatment. It is suitable for both pre-treatment and advanced treatment processes.
Since pulp particles are typically negatively charged, PAC, as a cationic coagulant, effectively destabilizes contaminants through:
- Electric double layer compression
- Charge neutralization
- Adsorption bridging
- Net trapping and flocculation
These mechanisms enable rapid floc formation, making PAC for paper wastewater treatment an ideal solution for improving sedimentation and pollutant removal.
Industry Background and Market Demand
According to industry data:
- Paper mill wastewater accounts for about 15% of total industrial wastewater discharge
- COD emissions from the paper industry represent over one-third of total industrial COD discharge
This makes wastewater treatment in pulp and paper mills a critical environmental priority.
Why Choose PAC and PFC for Paper Wastewater?
Both Poly Aluminum Chloride (PAC) and Poly Aluminum Ferric Chloride (PFC) are widely used as coagulants for paper mill wastewater treatment due to:
- High efficiency and low cost
- Effective color removal and COD reduction
- Reusable sludge as papermaking raw material
- Compatibility with biological treatment systems
When the dosage is ≤ 30 mg/L:
- Activated sludge systems remain stable
- PFC has slightly less impact on biological systems compared to PAC
Performance Results in Paper Wastewater Treatment
Under optimal conditions:
Using PFC:
- pH = 8
- Dosage = 6 mL
- Decolorization rate: up to 90%
- COD removal: up to 43%
Using PAC:
- pH = 8
- Dosage = 6 mL
- Decolorization rate: up to 78%
- COD removal: up to 37%
These results confirm that PAC coagulant for pulp mill wastewater provides reliable and stable treatment performance.
Conclusion
As a leading coagulant for paper wastewater treatment, Poly Aluminum Chloride (PAC) offers an optimal balance of efficiency, cost, and environmental performance. It is widely used in pulp and paper mill wastewater treatment systems to achieve effective solid-liquid separation and pollutant removal.
