Ductor Oy

Minna Lahtinen

Kerttu Koskenniemi

Ilona Oksanen

Nina Virolainen

Ari Ketola

Elisa Lensu

Jarkko Nummela

Ilkka Virkajärvi

Laura Tolvanen

Juha Karjalainen

The invention is a method of two-phase anaerobic digestion where monitoring and adjusting the nitrogen status (carbon to nitrogen molar ratio, i.e. C/N molar ratio or total or ammoniacal nitrogen content) enables maintaining optimum conditions during the process. The method improves the use of a variety of feedstock materials or facilitates monodigestion of one feedstock. Especially the introduction of nitrogen rich feedstock materials in the process is amended. A community of hydrolyzing and acidogenic microorganisms in the first phase digester performs ammonification i.e. release of organic nitrogen as ammonia. Nitrogen and phosphorus are removed and recovered from the digestate which then undergoes biogasification in the second phase of the process. Reject water from biogasification can be recycled within the process.

Biogas process with nutrient recovery

The invention provides a process for producing phosphate from an organic material, the method including the steps of (a) fermenting an organic material in a medium in the presence of at least one microorganism, wherein the fermenting is under conditions, and for a sufficient period of time, to produce a fermentation product; (b) treating the solids of the fermentation product with acid, in a medium, e.g., aqueous medium, to solubilize phosphates from the fermentation product; wherein the organic material, and thus the solids of the fermentation product, includes bone suitable for extraction of phosphates.

Method for recovering phosphorus from organic materials

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Espoo, Finland

Minna Lahtinen