Excavation Pit Dewatering
Treatment of groundwater and surface runoff from construction excavation pits. Removes suspended solids and turbidity for compliant discharge to storm drains.
PAM for Excavation Dewatering
Excavation dewatering generates turbid water from groundwater and surface runoff. PAM clarifies this water for reuse or discharge, reducing disposal costs by 40-60%.
How PAM Works
Dewatering Water Clarification
APAM at 2-8 ppm clarifies excavation water in 1-3 hours. Clarified water can be reused for dust control or discharged.
- Molecular weight: 12-18 million Da
- Hydrolysis degree: 25-30%
- Target turbidity: <50 NTU for discharge
Case Study
Foundation Excavation: Turbidity 400-800→20-40 NTU, Water reuse 0%→70%, Savings $25,000
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 "turbid water cannot be discharged to storm drains"?+
What results can I expect for "continuous pumping generates large water volumes"?+
Which products help solve "silt and clay particles resist natural settling"?+
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