Producing tailored fertilisers from digestate – the process
The process includes several integrated steps:
- Anaerobic digestion (AD)
Organic feedstock is processed to produce biogas and digestate. - Solid–liquid separation
Digestate is divided into solid and liquid fractions. - Evaporation of liquid fraction
Ammonia is removed and recovered, while water is separated. - Reverse osmosis (RO)
The condensed water is purified to meet discharge standards. - Drying of the solid fraction
- The solid fraction of the digestate is dried and it can be mixed with the evaporator concentrate to produce organic fertilizer product
- Product blending
Solid and liquid nutrient streams are combined to produce custom fertilisers.
The final products
- Solid phosphorus-rich fertiliser
- Nutrient concentrates (N, K, S)
- Tailor-made fertiliser blends