BOVO GAS, Lithuania

The biogas plant in Plungė, Lithuania, will use clean chicken manure as raw material in volumes that will reach 40,000 tons per year. The final product is biomethane, which will be injected into the common natural gas network (pressure around 55 bar). In addition, dry fertilizer products will be produced. The project has been developed with future expansion options – for the implementation of liquid fertilizer production technologies, as well as CO2 capture and liquefaction technologies.

The station project consists of more than 20 different engineering structures and buildings. They include:

• Two receiving tanks with water connection and mechanical stirring, which ensure the supply of homogeneous raw material for the fermentation process. The tanks are equipped with suction equipment and a biological filter for odor and emission treatment with 98% efficiency.
• Four fermentation tanks equipped with mechanical stirrers and a heating circuit for efficient biogas production. The tanks are covered with a double membrane system for gas collection and discharge, a safety relief valve, service platforms and process control sensors. For tank maintenance, the project includes custom-designed doors that also allow access for heavy machinery for more efficient cleaning.
• Biological pre-treatment station for the removal of sulfur and ammonia from biogas.
• Biogas production building, which includes biomethane production technology and a processing line for the raw material used. Biogas is purified to biomethane, which is then fed into the local natural gas network. The raw material processing line includes separation, drying and granulation, for the production of green and efficient granular fertilizer.
• Two post-fermentation tanks, where the separated digestate is stored. The tanks are equipped with a gas capture system to increase the efficiency of the process.

The plant will process 40,000 tons of chicken manure per year and produce:

• 40 GWh of biomethane;
• 14,000 tons of green granular fertilizer;
• 14,000 tons of green fertilizer concentrate;
• 4,000 tons of green liquid fertilizer products.