Construction Slurry Treatment

PAM for Slurry Treatment

Construction slurries (from TBM, diaphragm walls, pile boring) contain fine clay and silt. PAM clarifies slurry for reuse and reduces disposal volume by 50-70%.

How PAM Works

Slurry Clarification

APAM at 5-15 ppm clarifies construction slurry in 2-4 hours. Clarified water is recycled back to the slurry plant.

• Molecular weight: 15-25 million Da
• Hydrolysis degree: 25-30%
• Target turbidity: <100 NTU for recycling

Case Study

Diaphragm Wall: Water recycling 40%→75%, Fresh slurry 500→125 m³/day, Savings $15,000/month

Product Selection Guide

Dosing Tips

1. Always jar test first. Application-specific wastewater requires optimization. A 30-minute jar test saves weeks of field trial.
2. Prepare fresh solution daily. PAM solution degrades after 24-48 hours. Use chlorine-free water.
3. Gentle mixing. High shear breaks polymer chains. Use 30-50 RPM for 5-10 minutes after PAM addition.
4. Monitor for overdosing. Too much PAM causes charge reversal — flocs redisperse and turbidity increases.
5. 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.