Belt Filter Press
The DT-type belt filter press is a sludge dewatering machine used to process waste activated sludge (WAS) and mixed sludge from biological treatment at municipal wastewater treatment plants. The sludge dewatering press lowers the moisture content and volume of the sludge, which makes it easier to transport, landfill, incinerate, or process further. The belt filter press also serves water supply and drainage sludge dewatering, paper and pulp mill sludge dewatering, foundry, leather, and textile sludge dewatering, chemical plant effluent treatment, and food processing sludge dewatering.
As solid-liquid separation equipment, the press holds the sludge between upper and lower filter belts. Rollers apply progressively higher pressure and shear, which releases free water from the sludge. Dewatering takes place in three stages, gravity drainage, wedge pre-pressing, and medium-to-high-pressure pressing.
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| Configuration | Front-and-Back Stacked Type | Front-and-Back Stacked Type | Front-and-Back Stacked Type | Front-and-Back Stacked Type |
| Thickening Belt Width (mm) | 500 | 1,000 | 1,500 | 2,000 |
| Press Belt Width (mm) | 500 | 1,000 | 1,500 | 2,000 |
| Feed Sludge Moisture Content (%) | >95 | >95 | >95 | >95 |
| pH | 6–9 | 6–9 | 6–9 | 6–9 |
| Filter Cake Moisture Content (%) | ≤83 | ≤83 | ≤83 | ≤83 |
| Polymer Dosage (% of Dry Solids) | 0.3–0.5 | 0.3–0.5 | 0.3–0.5 | 0.3–0.5 |
| Sludge Throughput (m³/h) | 5–10 | 10–18 | 18–25 | 28–38 |
| Effective Belt Filtration Area (m²) | 10 | 15 | 20 | 25 |
| Overall Dimensions (L × W × H) (mm) | 4,500 × 1,100 × 2,000 | 4,500 × 1,700 × 2,000 | 4,500 × 2,200 × 2,000 | 4,500 × 2,700 × 2000 |
- Variable-speed drive for adjusting belt speed to sludge properties and treatment capacity
- Belt wash nozzles with an anti-clogging design for cleaning the belts during operation
- Inclined gravity zone that pre-dewaters and thickens the sludge before the pressing stage
- Automatic belt tracking device that reduces belt drift