PAM for Municipal Sludge Dewatering
Municipal wastewater treatment plants generate large volumes of waste activated sludge (WAS) and mixed sludge that must be dewatered before disposal. Our cationic PAM range (25-70% charge density, 12-20M MW) is specifically formulated for this duty — conditioning sludge for belt filter press, centrifuge, and screw press operations to achieve minimum cake volume and maximum solids capture.
Polymer Selection Guide
Choose the right grade based on your sludge type and equipment
| Category | Type / Equipment | Recommendation |
|---|---|---|
| Sludge Type | WAS (waste activated sludge) | Recommended charge: 40–60% |
| Sludge Type | Mixed (primary + secondary) | Recommended charge: 25–40% |
| Sludge Type | Aerobically digested | Recommended charge: 50–65% |
| Sludge Type | Anaerobically digested | Recommended charge: 55–70% |
| Equipment | Belt press | MW: 12–15M; dosage: 3–6 kg/t DS |
| Equipment | Centrifuge | MW: 15–20M; dosage: 4–8 kg/t DS |
| Equipment | Screw press | MW: 10–14M; dosage: 4–7 kg/t DS |
Technical Parameters
| Application | Municipal WWTP sludge dewatering |
| Recommended Type | Cationic PAM (CPAM) |
| Charge Density Range | 25–70% (select by sludge type) |
| Molecular Weight | 12–20 million Da |
| Typical Dosage | 3–8 kg per ton dry solids |
| Target Cake Moisture | ≤80% (belt press), ≤75% (centrifuge) |
| Solution Concentration | 0.1–0.3% |
| Dissolving Time | 60–90 min |
| Packaging | 25 kg PP woven bags |
Why Our PAM for This Application
- Selection guide: WAS → 40-60% charge; mixed sludge → 25-40%; digested → 50-70%
- Belt press optimized: 12-15M MW for strong, shear-resistant flocs
- Centrifuge optimized: 15-20M MW for high-G separation
- Reduces sludge volume 60-80% — saves hauling and landfill cost
- Free CST (Capillary Suction Time) test to select optimal grade
- Compatible with all mechanical dewatering equipment
Compatible Equipment
- Belt filter press dewatering
- Decanter centrifuge dewatering
- Screw press dewatering
- Gravity thickening pre-conditioning
- DAF (dissolved air flotation) sludge
Dosage Guide
3–8 kg per ton dry solids depending on sludge type and equipment. Always confirm by CST or jar test.
Frequently Asked Questions — PAM for Municipal Sludge Dewatering
How do I choose the right charge density for my sludge?
Run a CST test with 3-4 charge densities (30%, 40%, 50%, 60%). The lowest CST value indicates optimal charge neutralization. Generally: higher volatile solids (VS/TS ratio) = higher charge needed. WAS at 70% VS typically needs 50-60% charge.
What dosage should I start with?
Start at 4 kg/t DS for belt press, 5 kg/t DS for centrifuge. Increase by 0.5 kg/t DS increments until cake dryness target is met. Overdosing wastes chemical and can cause re-dispersion.
Belt press vs centrifuge — which product is different?
Same chemistry, different MW preference. Belt press needs larger flocs (12-15M MW) that hold together during gravity drainage and compression. Centrifuge needs higher MW (15-20M) flocs that resist shear forces at 2000-3000G.
Can you send a trial sample matched to my sludge?
Yes. WhatsApp us your sludge characteristics (VS/TS%, solids concentration, dewatering equipment type). We select 2-3 candidate grades, send 5 kg each, plus a CST test protocol guide. Results in 1-2 days.
What cost savings can I expect vs my current polymer?
Typical savings: 25-40% vs European brands (Zetag, Magnafloc, FLOPAM) at equivalent or better performance. On a 10,000 m³/day WWTP using 300 kg/month polymer, that is $3,000-5,000/year saved.
Do you supply to operating WWTPs currently?
Yes. We supply 20+ municipal WWTPs across Southeast Asia, India, Middle East, and Africa. Plant capacities range from 5,000 to 200,000 m³/day. References available on request.
