Starch & Fiber Recovery
Recovery of valuable starch and fiber from paper mill white water using PAM flocculation. Reduces raw material waste and white water pollutant load.
PAM for Starch Recovery in Paper Mills
Paper mills use starch as a sizing agent. Recovering starch from wastewater reduces raw material costs and environmental impact. PAM improves starch recovery efficiency by 20-40%.
How PAM Works
Starch Flocculation
APAM at 2-4 ppm bridges starch granules into large, fast-settling flocs. Recovered starch can be reused in the sizing process.
- Molecular weight: 10-15 million Da
- Hydrolysis degree: 20-25%
- Recovery efficiency: 70-85%
Case Study
Starch Recovery: 500 kg/day input, 80% recovery rate, $400/day value, $146,000/year savings
Product Selection Guide
| Application | Grade | Dosage |
|---|---|---|
| Primary application | APAM/CPAM 12-18M MW | 2-8 ppm |
| Sludge dewatering | CPAM 8-12M MW, 40-60% | 5-12 kg/t DS |
Dosing Tips
- Always jar test first. Application-specific wastewater requires optimization. A 30-minute jar test saves weeks of field trial.
- Prepare fresh solution daily. PAM solution degrades after 24-48 hours. Use chlorine-free water.
- Gentle mixing. High shear breaks polymer chains. Use 30-50 RPM for 5-10 minutes after PAM addition.
- Monitor for overdosing. Too much PAM causes charge reversal — flocs redisperse and turbidity increases.
- Batch consistency matters. We test every batch for MW (±0.5M tolerance) and retain samples for 24 months. If performance varies, it's a supplier problem, not a PAM problem.
Frequently Asked Questions
Why does my PAM performance vary batch to batch?
This is almost always a supplier consistency problem. Trading companies source from whoever is cheapest each month. We are the factory. Every batch is tested for MW and charge density. If you have a performance issue, we can compare your batch against retained samples.
Can I use the same PAM for clarification and dewatering?
Not optimal. Clarification needs APAM (anionic) at low dosage. Dewatering needs CPAM (cationic) at much higher dosage. Using one grade for both is a compromise — you'll either over-dose or under-perform.
What is the shelf life of PAM?
Properly stored (sealed bags, dry warehouse, below 35°C), PAM powder lasts 2-3 years. Once opened, use within 6 months. Emulsion PAM: 6-12 months sealed, 3 months after opening.
Frequently Asked Questions
How do you address the challenge of "starch loss in white water loop"?+
What results can I expect for "fine fiber loss reducing yield"?+
Which products help solve "white water cod buildup"?+
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