Objective
To make a distillery, energy self-sufficient by the biogas produced from the treatment in a digester, on the one hand of distillery wastes (originating from potato/cereal feedstocks) and on the other hand of animal manure. Fringe benefits should originate from the sales of digested distillery wastes as animal feed.
1. It appears that the 2-step reactor does not suit neither the feedstock animal manure nor the feedstock distillery wastes as too much biogas is already produced in step one. Hence, the global produced biogas is too rich in CO2. It also was found to contain too large amounts of H2S.
2. The predicted yields (design data) of 30 m3 of biogas per m3 of distillery wastes and of 25 m3 of biogas per m3 of animal manure could not be met. The obtained real data are 4.5 m3 biogas per m3 of distillery wastes and 5.2 m3 biogas per m3 of animal manure. The reason for these discupancies is not clear.
3. The investment costs amount to three times the predicted figures.
4. The digested distillery waste appeared not saleable as animal feed.
For these four reasons, the project became uneconomic and was abandoned.
Distillery wastes at the rate of 32 m3/d are fed at 35-37 C into an anaerobic digester of 402 m3 total capacity and 367 m3 working volume. In a first compartment, representing 20 % of the volume hydrolysis proceduces acetate and liberates a CO2-rich gas. The acetate is then fed through a coke bed into a second compartment, representing 80 % of the volume, where biogas with 80 % methane content is produced at 960 m3/d, without hydrogen sulfide. The total mean retention time is 11 days. The digester effluent, containing 70 % protein and rich in minerals is used as animal feed.
Liquid animal manure is digested at 12 m3/d in a separate similar digester of 254 m3 total capacity and 206 m3 working volume, in which the first and the second compartments represent respectively 12.5 % and 87.5 % of the volume. The mixed liquor is mechanically mixed. the total mean retention time is 17 days. The effluent is used as fertilizer.
The produced biogas is stored in a plastic gasholder of 2 800 m3capacity and utilized to generate electricity and heat.
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
4416 Everswinkel - Muenster
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.