Dewatering
Screw Press Dewatering
The SDP series separates water from conditioned sludge through a rotating screw and a stack of fixed and moving rings. Filtrate drains through the rings while the screw advances solids toward the cake outlet.
Compare selected model dimensions and installed power below. Share feed solids and the required dry-solids loading for a model recommendation.
SLUDGE DEWATERING SYSTEMS CO., LTD.
Where the SDP Series Fits
The SDP screw press removes free water from conditioned sludge to produce a cake for downstream handling. It can be evaluated for municipal biological sludge, industrial DAF float, chemically precipitated sludge, and wastewater sludge from food, beverage, textile and paper operations. The solids concentration, grease content and conditioning response determine suitability.
How the Screw Press Works
A slow-turning screw moves sludge through a cylinder of fixed and moving rings. Water drains between the rings while the available volume decreases toward the outlet. The resulting compression drives more filtrate out before the cake is discharged. Moving rings help keep the drainage gaps clear during operation.
Treatment Sequence
- Cake to handling
- Filtrate to return or treatment
- Feed and condition. Meter sludge to the conditioning stage and adjust polymer dose to form flocs that hold together.
- Thicken and press. Let free water drain first, then compress the concentrated solids as they advance along the screw.
- Handle the two outputs. Collect cake at the discharge and route filtrate to the appropriate return or treatment point.
Installation and Operating Checks
Check discharge clearance against your bin or conveyor height. Use operating weight when planning the support structure, and verify connected power and wash-water demand for the proposed model. For abrasive, corrosive or oily sludge, confirm wetted materials, expected wear and cleaning access before specifying the equipment.
SDP Model Specifications
| Model | Discharge height (mm) | L × W × H (mm) | Net weight (kg) | Operating weight (kg) | Power (kW) | Water use (L/h) |
|---|---|---|---|---|---|---|
| SDP-131 | 250 | 1680 × 700 × 915 | 205 | 300 | 0.2 | 24 |
| SDP-132 | 250 | 1905 × 830 × 915 | 225 | 425 | 0.3 | 48 |
| SDP-201 | 350 | 2535 × 920 × 1465 | 320 | 470 | 0.74 | 32 |
| SDP-202 | 350 | 2615 × 980 × 1655 | 470 | 730 | 1.11 | 64 |
| SDP-301 | 455 | 3325 × 870 × 1760 | 910 | 1320 | 1.5 | 40 |
| SDP-302 | 455 | 3455 × 1165 × 1760 | 1350 | 2130 | 2.25 | 80 |
| SDP-303 | 495 | 3670 × 1590 × 1760 | 1820 | 2880 | 3 | 120 |
| SDP-351 | 585 | 3475 × 905 × 1820 | 1610 | 2210 | 1.1 | 72 |
| SDP-352 | 585 | 3675 × 1286 × 1820 | 2300 | 3400 | 2.75 | 144 |
| SDP-353 | 585 | 3645 × 1725 × 1820 | 3350 | 4850 | 3.85 | 216 |
| SDP-354 | 585 | 4130 × 2180 × 1820 | 5600 | 6100 | 4.95 | 288 |
| SDP-401 | 759 | 3905 × 1900 × 2210 | 2500 | 4300 | 1.85 | 80 |
| SDP-402 | 759 | 4240 × 1570 × 2210 | 3480 | 5200 | 2.95 | 160 |
| SDP-403 | 759 | 4465 × 2060 × 2210 | 4550 | 7050 | 4.05 | 240 |
| SDP-404 | 759 | 4670 × 2630 × 2210 | 6550 | 9680 | 5.15 | 320 |
Capacity Reference for DAF Sludge at 5% Feed Solids
The catalogue examples below are for dissolved air flotation sludge at 5% feed solids. The listed flows and dry-solids loads are consistent at an assumed feed density of 1,000 kg/m³. These approximate values are for preliminary selection. Confirm the model with your actual sludge and required cake solids.
| Model | Dry-solids load (kg DS/h) | Feed flow (m³/h) |
|---|---|---|
| SDP-132 | 40 | 0.8 |
| SDP-201 | 40 | 0.8 |
| SDP-202 | 80 | 1.6 |
| SDP-301 | 100 | 2 |
| SDP-302 | 200 | 4 |
| SDP-303 | 300 | 6 |
| SDP-352 | 400 | 8 |
| SDP-353 | 600 | 12 |
| SDP-354 | 800 | 16 |
| SDP-403 | 1,020 | 20.4 |
| SDP-404 | 1,360 | 27.2 |
Calculate the Dry-Solids Load
Multiply feed flow (m³/h) by sludge density (kg/m³) and feed solids as a decimal to estimate the dry-solids load (kg DS/h). For example, 2 m³/h of sludge at 2% solids and an assumed density of 1,000 kg/m³ gives 40 kg DS/h. This calculation describes the incoming load. Model throughput and cake solids depend on sludge characteristics and should be confirmed for the project.
Request a Model Recommendation
Share the sludge source, average and peak feed flow, feed solids, operating hours, and desired cake solids. Add any available sample test data, plus the intended cake discharge and filtrate return arrangements.