research project NEVO
Development of a process for monofermantation of nitrogen-stressed manure and its technical implementation. A hybrid process for the realization of a high performance methane stage from trickle bed, anaerobic filter and upflow anarobic sludge bed
Partners: Robert Boyle Institute
ATB: Leibniz-Institut für Agrartechnik Potsdam-Bornim e.V.
Bio-H2-Umwelt GmbH
Lytec GmbH
GEMES Abfallentsorgung und Recycling GmbH
Eurofins GmbH
IPH Klawon.Selzer GmbH
Funding: VDI/VDE Innovation + Technik GmbH
Project Management Agency ZIM Network Funding
Duration: September 2016 - December 2019
Contact: Prof. Dr.-Ing. habil. Christina Dornack
Projektbeschreibung:
The aim of the project is to develop and technically implement a process engineering concept - called the NEVO process - for the utilization of nitrogen-rich farm manure, so that mono-digestion of these feedstocks - especially poultry manure - can be realized.
For substrates with high nitrogen contents and salt loads, a process-stable operation is a challenge. Depending on temperature and pH, there is a dissociation equilibrium between ammonium and ammonia. However, ammonia is toxic and has a corresponding inhibitory effect on microorganisms.
In order to achieve a stable process, the process to be developed aims at separating the hydrolysis/acidogenesis stage from methanogenesis in order to optimize the degradation of the organic carbon load. The aim is to achieve purification efficiencies of 95 % within 24 h. The process is to be based on a short residence time. These short residence times are to be achieved by the stepwise adaptation of the microorganisms to high space loads and nitrogen contents.
The targeted high-performance methanation of the liquid phase was carried out using growth supports, which represent a larger growth surface for the microorganisms.
The performance parameters of the reactors were determined using a model substrate consisting of sewage sludge, amino acids, acetic acid and glucose.