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FOR LIQUID DIGESTATE
RM Digestate Dryer
A plate-belt drying system that remixes liquid digestate without a separator and creates a granular product that retains high NPK content.
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Technical summary
Efficient process, consistent end product.
The defining feature of the RM dryer is its ability to dry liquid digestate at about 8% dry matter without a separator. Fresh liquid feed is remixed with part of the dried product until it reaches 45-60% DM. Liquid forms around the dry particles, creating a belt-compatible granular structure and increasing contact with hot air.
The mixture is distributed evenly on the upper plate belt. Outside air heated by water-to-air exchangers using hot water at around 90 °C is drawn through the perforated steel plates and product layer. Product moves through the belt passes and leaves at 85-88% DM. Part returns to the mixer and the remainder goes to storage or downstream processing.
Because no separator is used, NPK losses associated with liquid/solid separation are limited. Typical digestate may contain approximately N 25 kg/ton, P 30 kg/ton and K 60 kg/ton; no NPK is added during drying.
Technical summary
Key process values
Final values are defined during engineering according to material analysis, capacity and the available heat source.
- Inlet dry matter
- Approximately 8%
- Remixed dry matter
- 45-60%
- Outlet dry matter
- 85-88%
- Belt width
- 2 m or 3 m
- System length
- 6-30 m
- Typical N / P / K
- 25 / 30 / 60 kg/ton
Process steps
The material path through the plant.
Digestate is remixed with dried product to 45-60% DM.
A travelling mixer/dosing belt spreads the mix on the upper plate belt.
Heated outside air is drawn through the layer to evaporate water.
Product moves between belt passes and dries.
Part of the dried product returns to the mixer; the rest goes to storage.
End product and applications
Operational and commercial value created by drying.
- Granular product suitable for direct marketing
- Retention of high NPK content
- Use of waste heat at the biogas plant
- Elimination of separator investment
- Reduced storage and transport volume
Model dimensions
Brochure model dimensions.
| Model | A (mm) | B (mm) |
|---|---|---|
| RM 6-2 | 6000 | 9470 |
| RM 9-2 | 9000 | 12470 |
| RM 12-2 | 12000 | 15470 |
| RM 15-2 | 15000 | 18470 |
| RM 18-2 | 18000 | 21470 |
| RM 21-2 | 21000 | 24470 |
| RM 24-2 | 24000 | 27470 |
| RM 6-3 | 6000 | 8920 |
| RM 9-3 | 9000 | 11920 |
| RM 12-3 | 12000 | 14920 |
| RM 15-3 | 15000 | 17920 |
| RM 18-3 | 18000 | 20920 |
| RM 21-3 | 21000 | 23920 |
| RM 24-3 | 24000 | 26920 |
| RM 27-3 | 27000 | 29920 |
| RM 30-3 | 30000 | 32920 |
Complementary technology
Modules working within one process.
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