Skip to content 
Effective wastewater treatment is essential in every sand washing plant. By using polyacrylamide (PAM) correctly, plants can separate mud and water more efficiently and improve sludge dewatering. This article explains the complete process of wastewater treatment in a sand washing plant.
Dissolve PAM Properly for Better Flocculation
To get the best results from PAM:
✅ Add PAM evenly to ensure it fully dissolves. Undissolved particles can reduce performance.
✅ Stir well until the solution becomes stringy. This means PAM is ready to help flocculate suspended solids.
Why it matters: Fully dissolved PAM improves the flocculation process, making it easier to separate mud and water.
Wastewater collection and concentration
✅ Wastewater first enters a collection tank.
✅ Then, a sludge pump transfers it to a sludge thickener (concentration tank).
✅ Inside the tank, PAM is added and mixed well with the wastewater. This promotes solid-liquid separation.
Why it matters: Pre-concentration reduces the load on downstream processes and makes sludge treatment more efficient.
Improve Sludge Dewatering with Smart Dosing and Filter Press
✅ After PAM reacts with the wastewater, solids start settling, and the water gets clearer.
✅ The sludge is sent to a filter press, and PAM is added again in the pipe to increase dewatering efficiency.
✅ A belt filter press then processes the sludge:
- Gravity dewatering
- Mechanical pressing
- Final squeezing into solid mud blocks
Why it matters: This three-step dewatering process improves water recovery and reduces waste volume, making disposal easier and cleaner.
Summary: Key Points for Efficient Wastewater Treatment
To make wastewater treatment efficient in sand washing plants:
✅ Make sure PAM is fully dissolved
✅ Add chemicals at the right stages
✅ Optimize mud-water separation
✅ Improve sludge dewatering with a filter press
By following this process, sand washing factories can reduce environmental pollution and increase treatment efficiency, while also saving costs on water reuse and sludge handling.
