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Collaborative project: Farm fertilizer production from digestate by reducing the nitrogen emission and concentration of plant nutrients during the drying process (DuenGaer) - subproject 1 (DuenGaer)

Project


Project code: 2818106415
Contract period: 01.09.2017 - 30.09.2020
Budget: 380,761 Euro
Purpose of research: Applied research

The project aims to develop and approve an innovative, efficient and low-emission process for the continuous digestate drying in field tests. The process development is focused on the production of a transport worthy farm fertilizer with preferably maximum nitrogen concentration. With the nitrogen enrichment and reduction of nutrient and ammonia emissions aspired, the project meets the objectives of an environmentally-friendly use of the resource 'plant nutrients” and a sustainable agriculture. The focus of the project lies in the experimental research of the drying process of different digestates at laboratory and semi-technical scale. The physical relationships are examined between geometric (constructive), drying-technological and material parameters in order to achieve a reliable scale-up for the design and dimensioning of the novel dryer apparatus on this basis. In the second half of the project, a mobile pilot plant of the novel digestate dryer will be tested at the site of the Lindenhof Agrar GmbH. The functionality of the demonstrator will be proved in term of energy efficiency and nutrient nitrogen enrichment. In addition, the energy efficiency of the air cleaner is assessed. The ATB will investigate the fundamental drying and emission behavior (ammonia, nitrogen) of the selected digestates at laboratory and semi-technical scale. The results of these studies will be analysed in cooperation with the project partners in order to prepare the scaling up. Based on the scale-up, the partner R & F will conduct the development, construction and manufacturing of the demonstration plant. At the production site in Gollwitz, the partner LAG will care for a smooth integration of the demonstrator in the existing heat net and the supply of media flows. During the industrial-scale testing period, further process optimization will be performed in cooperation with the project partners.

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