Finnish Environment Institute | Suomen ympäristökeskus | Finlands miljöcentral

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Recycled fertilizers

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Technology for spreading the recycled fertilizers.
Photo: Ari-Matti Seppänen

Unprocessed biogas digestate is not optimal fertilizer from farmers’ perspective. Nutrient balances are not optimal, and digestate is rather dilute. In particular large biogas plants should process digestate into more concentrated and transportable forms.

Biogas plants have faces challenges in finding suitable and cost-efficient processing technologies. Digestate can be separated into solids and liquid forms. Solids (dry matter content 30 %) can be transported in a more cost-effective manner.

Nitrogen rich liquid can be concentrated however, many of the tested technologies have not been successful as heterogeneity makes it more demanding to process. Therefore, digestate processing is not currently very common, even internationally. Some processing technologies are currently under development.

Published 2018-07-06 at 10:10, updated 2018-07-06 at 10:10
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