WIMA Belt Filter Press.
Belt Filter Press
Maximum Dewatering Efficiency
Our belt filter press plays a key role in continuous sludge dewatering, achieving high throughput rates and dry solids content. Energy, water and polymer consumption are kept as low as possible to ensure efficient and sustainable operation.
From municipal and industrial applications to sand and gravel processing, the belt filter press offers a wide range of possible uses.
FUNCTION Of BELT FILTER PRESSES
WIMA belt filter presses are designed for continuous sludge dewatering with maximum throughput and dry solids content. While maintaining this objective, energy, water and polymer consumption are kept as low as possible.
Depending on the required throughput and the specific process conditions, the belt filter press is available with belt widths of 1.2 m, 1.8 m and 2.4 m.
1.PRE-DEWATERING
The flocculated sludge is gently fed via the inlet nozzle onto the horizontal pre-dewatering zone and evenly distributed across the full belt width. Free water drains through the filter belt. A system of guide plates, deflector plates and drainage aids supports the dewatering process and ensures uniform material distribution. After this stage, at least 50 % of the water has already been removed. The sludge has gained sufficient stability to withstand light pressure.
2.INITIAL PRESSING
The sludge is enclosed between the upper and lower belts and guided around a specially designed dewatering roller. Light pressure is applied to the filter cake. Special sealing systems prevent lateral leakage of sludge. Dewatering takes place on both sides, outward and inward into the roller. The water is discharged laterally without any risk of sludge rewetting.
3.MAIN PRESSING ZONE
Due to the increased stability of the sludge cake, the contact pressure can now be continuously increased. The sludge passes through several alternating pairs of press rollers while enclosed between the two belts, releasing the majority of the mechanically removable water.
4.FINAL PRESSING
The remaining water is removed by a further increase in pressing pressure along the press path.
The pressure is continuously and evenly increased up to the discharge point of the dewatered sludge cake.
5.BELT RETURN AND CLEANING
The actual dewatering process is complete.Both filter belts return and are tensioned hydraulically and independently of each other, with fully automatic regulation.
At the same time, spray pipes equipped with replaceable nozzles clean both belts. The continuous dewatering process can then continue without interruption.
KEY FACTS.
OBJECTIVE OF SLUDGE DEWATERING
The objective of mechanical sludge dewatering is to significantly reduce the water content of the sludge, thereby making downstream processes more economical.
Volumen Reduction
Significant reduction of sludge volume to decrease transport and disposal effort.
Improved Handling
Production of a dewatered sludge cake with dry solids contents of up to approx. 40 %, allowing easier storage and transport.
COST REDUCTION
Reduction of transport, storage and disposal costs due to lower masses and volumes.
PROCESS ENGINEERING SEQUENCE
Pre-Thickening
Prior to mechanical dewatering, the sludge is thickened in order to significantly reduce the water content and enable economical dewatering.
Mechanical Dewatering
In the WIMA belt filter press, conditioned sludge is continuously dewatered between two circulating filter belts.
Conditioning
The addition of polymers forms stable flocs that support the separation of solids and water and improve dewatering performance.
Technical Data
| DIMENSIONS (approx.) | |
|---|---|
| Length | 5.950 mm |
| Height | 2.500 mm |
| Frame Width | 3.000 mm |
| Width without Drive | 3.500 mm |
| Width with Shaft-Mounted Geared Motor | 4.200 mm |
| Screen Width | 2.400 mm |
| Operating Width | 2.200 mm |
| TOTAL WEIGHT (approx.) | |
| Total Weight | 13.000 kg |
| SCREEN TENSION | |
| Top Screen | b= 2.400 mm / l= 16.300 mm |
| Bottom Screen | b= 2.400 mm / l= 19.500 mm |
| Material | Polyerster/ Polyamide - Spiral Screen |
| WATER | |
| Water Requirement for Screen Cleaning | approx. 16,9 m³ / h |
| Water Pressure | approx. 6 bar |
| POWER | |
| Operating Speed | approx. 1,3 – 6m / min |
| Drive Power Belt Filter Press | 2 x 3,0 kW, 230 / 400 V 50 Hz, IP500 |
| Drive Power Hydraulic Unit | 1,1 KW |
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