Objective The project aims at producing biogas from poultry or pig manure and other agricultural washes using an innovative 2 step biomethanation wastewater treatment plant. However further investigations should show the fertilization power of the sewage can be valorized in periods of plant growth, without contamination of ground-water. The produced biogas will be used mainly for heating purposes, but also for drying organic material. The produced solid residue after dewatering will be mixed with solid agricultural wastes for compost production. The residual liquid effluent will be discharged as sewage to the local wastewater treatment plant.Payback time is 2.75 years.The plant has been completely built and is running. The present installation is slightly different of this planned. Unfortunately, the quantity of biogas and compost foreseen has not been obtained.The production of biogas is about 32 m3/day to compare with 280 m3/day planned; taking into account the electric and thermal energy used by the plant, the energy balance is negative.The solid and liquid residues, used as fertilizers, amount to 892 m3/year; the volume of compost foreseen was 2120 m3.In this situation, the payback time is 22 years.So, the project is not a technical success and has no economic viability.The innovative 2 step biomethanization system includes as first step an acidogenic upflow reactor and as second step a methanogenic upflow reactor. Each of the reactors is equipped in its upper third with a special filter to retain the respective active biomass within the reactors. Each reactor is also equipped in its top part with a special device to separate the biogas from the mixed liquor. The acidogenic reactor acts in its lower part as a decanter. Solid non-fermented particles accumulate in this part. They are periodically removed, washed thoroughly in a special device with effluent from the methanogenic reactor before being discharged as odorless stabilized solid effluent.As the total size of both reactors is +/- 30 m3, the retention times according to the daily input rates will be +/ 30,0, 15*, 10, 7,5*, 6, 5*, 4,3, 3,75*, 3,3, 3*, 2,7, 2,5* days. (* marked retention times can be set on the switch-board).Upstream of the innovative biomethanation systems, between 6 and 12m3/d-1 of manure from various animals at 10% maximum dry weight are grinded to particles of 5 mm mean size.Downstream of the innovative biomethanation system the biogas is dewatered, immediately burned in a boiler furnace and the produced heat-energy stored as hot water at 70 to 90 deg.C in an thermally, insulated tank.Total cost of the project is 13.471.500 Flux, the whole of it being eligible. EEC contribution amounts to 5 085 116 FLUX. Total investment costs amounts to 11 692 380 FLUX (VAT included). The energy production is expected to be 58 toe as biogas and 7 toe for process heat.Yearly maintenance and operation costs are evaluated at 561 kFLUX. One toe per year is produced per 34 838 FLUX costs of which 26 206 FLUX investment costs and 8 632 FLUX operation costs.Compared to oil, the biogas produced is 1/3 more expensive. However, a first fringe benefit arises from the protection of underground water from contamination through untreated manure. A second fringe benefit arises because of non-contamination of the environment with SO2 in air. A third financial benefit arises from the production of compost of better quality because of the improved biomethanation system. For this reason, although the investment costs are twice as high as an analogous one-step biomethanation system, the simple payback period decreases from 4.5 years to between 2.8 and 3.3 years depending on the scenario for composting (8-28 m3 per week) which request a complementary investment amounting to 1-4 MFLUX.Monitoring includes detailed mass balances around the digester, namely to calculate and/or monitor the rate of hydrolysis, the rate and the yield of methanogenesis, the quality of effluent digested sludge, the gas composition (in H2S), the volatile fatty acid content of digesting liquors. Rates of output methanogenesis will be compared to inputs with a time delay factor (what has been introduced yesterday has an influence today). Programme(s) ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985 Topic(s) 1.3 - PRODUCTION AND USE OF BIOGAS Call for proposal Data not available Funding Scheme DEM - Demonstration contracts Coordinator FONDATION APEMH EU contribution No data Address DOMAINE DU CHATEAU RUE DU CHATEAU 10 4976 Luxembourg Luxembourg See on map Total cost No data
