Case History
MARAZZATO FARM
We are in Trebaseleghe, in the countryside of Padua. Agostino Marazzato’s company is a masterpiece to see and visit: a perfect example of a garden in a rural framework, where there is also the innovative and efficient plant realised by IES Biogas.
Made in Italy, perfectly integrated in the production cycle of the company, is able to feed into the national grid up to 625 kWe per hour and meet the needs of 2,000 families, without waste, without odours, to the benefit of the environment and the community. An investment that has effectively completed the self-sufficiency cycle of Marazzato’s farm, a company founded in 1966 and which today has grown particularly in pig breeding: there are a thousand sows, from which about 28,000 pigs are born each year. Thermal energy for housing heating needs and quality natural fertilizer are also produced. In this way, the cycle is perpetuated over time, with a high level of efficiency.
TECHNICAL DATA SHEET // 625 kWe
INSTALLED ELECTRIC POWER 625 kW
| INSTALLED ELECTRIC POWER | 625 kW | ||
|---|---|---|---|
| DOUBLE-STAGE MESOPHILIC PROCESS | |||
| Pre-tank | n.1 | Ø 08m | h=4m |
| Fermenters | n.2 | Ø 22m | h=6m |
| Storage tank | n.1 | Ø 28m | h=6m |
| Biomass feeder | n.1 | stirrer | 60mc |
| DAILY FEEDING PLAN | |||
|---|---|---|---|
| Pig sewage | 30 ton | ||
| Corn silage | 24,0 ton | ||
| Triticale silage | 9,6 ton | ||
| Sorghum silage | 1,0 ton | ||
| ENERGY EFFICIENCY | |||
|---|---|---|---|
| Annual energy production | 5.000.000 kWe | ||
| Annual production of biogas | 2.500.000 mc | ||
| Methane concentration (CH4) in biogas: | 52-54 % | ||
| COGENERATION GROUP | |||
|---|---|---|---|
| Manufacturer | AB Energy | ||
| Model | Ecomax 6 Bio | ||
| ENGINE | |||
|---|---|---|---|
| Manufacturer | GE Jenbacher | ||
| Model | J 312 GS-C25 | ||
Biogas is one of the most widely used alternative sources of renewable energy production.
Biogas is the product of microbial degradation of organic substances in the absence of oxygen, a process commonly called anaerobic digestion. It is a mixture of gases, mainly composed of methane (CH4) and carbon dioxide (CO2).
Slurry from the barn, together with corn and triticale silage, is daily put into the two mainly digesters. Here they remain for about 100 days and then pass into the covered storage tank. The process is therefore of “double-stage” type and takes place at a temperature of 38-42 degrees (mesophilia). The “double-stage” technology allows a safe and elastic fermentation process but, above all, guarantees adequate retention times.
The covering of the storage ensures a complete degradation and therefore an efficient exploitation of the biomass used. Moreover, it also allows a greater reserve of biogas and a better desulphurisation (removal of H2S). Desulphurisation is biological, by injection of very small amounts of oxygen. The internal structure and a desulphurisation network offer an excellent surface for the colonisation of the desulphuriser bacteria. The biogas produced is conveyed to the cogenerator, which produces electricity and thermal energy.
The electricity is transferred to the public grid, the heat is reused partly for the fermentation process, partly for the district heating of barns and offices. At the end of the fermentation process the digestate is obtained: a liquid material, completely odourless, with very high agronomic value, with improved characteristics compared to the raw material.
The digestate undergoes a process of solid/liquid separation: the solid that has the consistency, appearance and smell of a “soil-humus”, is distributed in the fields with a manure spreader or sold to specific users such as flower-gardeners.
TO THE BENEFIT OF WATER, AIR AND SOIL QUALITY.
