Objective
The use of an anaerobic 2 stage treatment to simultaneously produce biogas and reduce the polluting charge of the distillery liquid effluent.
1. The actual system meets the design and daily performance data given in the project description.
2. Originally, the proposed system included an anaerobic and an aerobic step in sequence. The latter aerobic step, performed in an aerated tank, was abandoned because of unsolved odour problems. The unpollution performed by the first anaerobic step proved however sufficient to meet the local standards.
3. Originally also, 10 to 15 tons per day solid wastes of the distillery, originating from grapes and figs, were foreseen as feedstock for the anaerobic treatment plant but caused corrosion in the pump chosen to handle these, so that they could no longer serve as feedstock and were abandoned.
4. Present raw materials for the distillery prove to contain less organic by-products as the raw materials taken into account in the original proposal.
This, together with the abandon of the solid wastes as feedstock for biomethanation results in lesser rich waste available for the anaerobic treatment. As a result, less biogas than originally foreseen is produced, a fact which caused the economic failure of the project. However, two new similar anaerobic treatment plants have been constructed with the experience acquired with the present demonstration project. They were designed in a more appropriate way to the available substrate and proved less costly in investment thereby making the newly constructed system again economically attractive.
5 m3/h vinasse (COD 90 g/l and BOD 36 g/l) are digested in two thermophilic (T = 53 C), completely-mixed reactors of 600 m3 each in parallel with a global mean retention time of 10 days. Mixed liquor is periodically extracted from the digesters and transferred to an anaerobic second stage and simultaneous settling tank. Settled biological sludge is mainly recycled to the digesters, while the excess is disposed of on a dumping site. Biogas is collected in a 60 m3 solid floating gas holder and then burned in a boiler to supply process heat. Effluent liquid shows a conversion of 70 to 80 % on a COD basis and 85 to 90 % on a BOD basis. The entire system is automatically controlled. Mean biogas production rate amounts to 3 m3/m3 of digester per day and the annual energy substitution is 800 TOE/yr.
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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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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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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
10433 Athens
Greece
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.