Advantages of PAC Over Traditional Coagulants
Stronger Coagulation Performance
PAC is a high-molecular inorganic polymer containing polyhydroxy aluminum ions (e.g., Al₁₃, Al₁₅), with higher charge density and stronger charge neutralization capacity. It can more quickly neutralize the negative charges on suspended particles and promote rapid floc formation. Even under low turbidity or low temperature conditions, it maintains stable performance. In contrast, traditional agents like aluminum sulfate react more slowly, produce smaller and looser flocs, and offer less stable treatment results.
Wider PH Range
PAC remains effective within a pH range of 5.0–9.0, while traditional coagulants often operate within narrower ranges (typically 6.5–7.5). This makes PAC more flexible and stable when treating various types of raw water (acidic, alkaline, industrial), reducing the need for frequent pH adjustments and lowering operational complexity and chemical costs.
Lower Dosage and Less Sludge
Thanks to PAC’s high active content and strong reactivity, the required dosage is only 30%–60% of traditional coagulants for the same treatment effect. Additionally, the aluminum hydroxide flocs formed by PAC are dense and stable, resulting in significantly reduced sludge volume after settling and lower sludge dewatering and disposal costs.
Clearer Water and Higher Removal Rates
The flocs formed by PAC settle faster and remove particles more thoroughly. It significantly improves the removal rate of turbidity, color, organics, iron, manganese, and other impurities, producing clearer and more transparent water. The resulting flocs are larger and denser, with excellent filtration performance, reducing the load on downstream filtration equipment.
Lower Corrosiveness and Longer Equipment Life
Compared to ferric chloride and other traditional coagulants, PAC’s hydrolysis products are milder and less corrosive to metal equipment, coagulation tanks, and pipelines. This helps extend equipment lifespan and reduce maintenance costs.
Environmentally and Health Friendly
PAC contains low residual aluminum and does not significantly alter water pH during treatment. Its flocs are easy to separate and pose no secondary pollution risk, meeting international drinking water standards (such as WHO, EPA, GB). Its coagulation by-products have minimal environmental impact, making it more suitable for drinking water and food industry water applications.
| Property / Coagulant |
PAC (Polyaluminium Chloride) |
Alum (Al₂(SO₄)₃) |
Ferric Chloride (FeCl₃) |
| Effective pH Range |
4–9 |
5.5–7.5 |
3–6 |
| Floc Formation Speed |
Fast |
Moderate |
Slow |
| Sludge Volume |
Low |
High |
High |
| Residual Metal |
Low |
Higher Al³⁺ |
High Fe³⁺ |
| Temperature Sensitivity |
Low |
High |
High |
| Storage Stability |
Excellent |
Poor |
Moderate |
| Cost Efficiency |
High |
Medium |
Medium |
| Typical Dosage |
30–70 mg/L |
60–150 mg/L |
80–120 mg/L |
Conclusion
Polyaluminium chloride (PAC) has proven to be one of the most effective and reliable coagulants in modern water treatment. Its superior charge neutralization ability, broad pH adaptability, and low sludge production make it an ideal replacement for traditional coagulants like alum or iron salts. For large-scale water treatment plants and industrial users seeking stable performance, low operating costs, and long-term system reliability, PAC offers an outstanding and forward-looking solution.
Call to Action
Looking for a reliable bulk supplier of Polyaluminium Chloride?
Contact Kesen from OYI now for technical data, samples, or a customized quote.
Email: oyi@oyipolymer.com
whatsapp 8618795697338
Brand: OYI– Your Trusted Partner in Water Treatment Solutions.
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