Digestate Management

Digestate Management

Digestate is a by-product of the anaerobic digestion process, rich in organic matter and nutrients such as nitrogen, phosphorus, and potassium.
Proper management of this stream is crucial not only to prevent environmental issues but also as a valuable resource for agricultural production and soil improvement.
The following introduces the three main approaches in digestate management:

1. Solid-Liquid Separation

The solid-liquid separation process is performed using mechanical equipment such as separators, centrifuges, and pressure filters.
This method allows for better digestate management:

  • The liquid fraction is rich in nitrogen and potassium and is used as liquid fertilizer on fields.
  • The solid fraction contains high levels of organic matter and phosphorus, used as compost substrate or as raw material for pelletizing.


Solid-Liquid Separation

2. Nutrient Recovery

Advanced technologies allow key nutrients in digestate to be extracted and converted into higher-value products:

  • Production of concentrated nitrogen as a widely used liquid fertilizer.
  • Recovery of phosphorus and potassium for producing alternative chemical fertilizers.
  • Reducing surface and groundwater pollution through optimal nutrient management.

This approach helps close the nutrient loop and reduces dependency on chemical fertilizers.


Nutrient Recovery

3. Composting

The solid fraction of digestate after separation can enter the composting process, adding significant value:

  • Production of stable compost that improves soil structure.
  • Odor reduction and stabilization of unstable organic matter.
  • Possibility of pelletizing compost for easier transport and export.


Composting

✅ Conclusion

Digestate management is not only an environmental necessity but also an economic opportunity for producing alternative organic and chemical fertilizers.
Choosing the right combination of methods based on project conditions can ensure optimal efficiency.