Agricultural biogas plant – How does it work and support agriculture in Poland?
Agricultural biogas plants as a pillar of modern agriculture and renewable energy
Agricultural biogas plants are becoming increasingly popular in Poland as key elements of modern agriculture and local renewable energy. Thanks to biotechnological processes such as methane fermentation, enable efficient processing of organic waste and production agricultural biogas. A biogas installation allows farms to cover their own energy needs in terms of electricity and heat, while at the same time increasing energy independence.
What is an agricultural biogas plant and how does it work?
Agricultural biogas plant is a renewable energy installation that uses the anaerobic fermentation of organic materials such as slurry, manure, corn silage, and plant waste. As a result of methane fermentation, biogas, the main component of which is methane.
Biogas plants play an important role in production renewable energy sources (RES), contributing to improving the quality of the natural environment, reducing greenhouse gas emissions and increasing the energy security of farms.
Types of biogas plants and biogas production technologies
There are different types of them in Poland biogas plant, which differ in location and substrate processing technology.
Agricultural biogas plants
They process waste from animal breeding and crop production, such as slurry, manure and crop residues.
Industrial biogas plants
Agri-food processing plants use biogas installations to manage pomace, pulp, distillers' grains and other organic waste.
Municipal biogas plants and sewage treatment plants
They process municipal waste, bio-waste and sewage sludge – both domestic and industrial.
Fermentation technologies
Depending on the process temperature, fermentation is distinguished:
psychrophilic,
mesophilic,
thermophilic.
Each methane fermentation technology differs in efficiency, process duration and technological requirements.
The importance of biogas in agriculture and energy
Production agricultural biogas allows for the reduction of methane emissions into the atmosphere and improvement of the energy balance of farms. Agricultural biogas plant It also provides an additional source of income by selling surplus electricity to the grid.
Biogas as a gaseous fuel is of particular importance for energy security, because it can be stored and used in periods when other renewable energy sources – such as photovoltaics or wind turbines – they do not produce energy.
Biogas installations operate in a controllable manner, thus fulfilling a regulatory function in the power system. Cogeneration of electricity and heat is rewarded with the highest reference prices among renewable energy technologies.
A particularly important role is played by micro biogas plants (up to 100 kW), which strengthen local energy security and reduce network operating costs.
How an agricultural biogas plant works – the biogas production process
Methane fermentation process
Biogas production takes place in fermenters, where microorganisms decompose wet biomass into simple chemical compounds. The process involves the breakdown of sugars, fats, proteins, and alcohols, and ultimately, methanogenic microorganisms produce methane.
Controlling temperature, pH and substrate composition is crucial to ensure stable and efficient biogas production.
Use of substrates
IN agricultural biogas plants applies:
slurry and manure,
vegetable silages,
agri-food waste,
residues from the food industry.
Appropriate substrate balancing affects the profitability of a biogas installation.
Biogas and digestate management
Biogas is fed into a gas engine, where combustion powers a generator that produces electricity. Waste heat is used to heat fermenters and in drying rooms, cold stores, and livestock buildings.
The digestate is a valuable organic fertilizer – without pathogens and with high nutrient absorption.
An alternative is to purify the biogas into the form biomethane, which can be injected into the gas network or used as fuel.
Construction of an agricultural biogas plant – investment stages
The construction of a biogas plant includes:
analysis of substrates and their biogas potential, technical and economic analysis, technological design,
obtaining permits, preparing documentation, investment power of attorney (we conduct the entire process on behalf of the client),
construction of a biogas installation, commissioning, process optimization and guarantees.
Modern biogas plants are equipped with monitoring systems, industrial automation, and active and passive protection.
Financing biogas plants – support programs
In Poland, investment support programs are available in agricultural biogas plants, including the program "Energy for the Village"Financing a biogas plant can significantly shorten the payback period.
Preferential loans and programs enabling partial write-off of financial liabilities are also available.
Biogas production in Poland – market development
There are approximately 400 biogas plants operating in Poland, but the potential for agricultural biomass is much greater. The development of the biogas market is supported by climate policy and the need to diversify energy sources.
Biogas as a local energy source contributes to the stabilization of the power system and the reduction of CO₂ emissions.
Biogas as an energy source for farms
Agricultural biogas plant allows the farm to:
reducing energy costs,
sale of electricity to the grid,
heat management in cogeneration,
production of organic fertilizer.
Cogeneration, i.e. the simultaneous production of electricity and heat, significantly increases the profitability of the investment.
Challenges and public consultations in the construction of a biogas plant
The construction of an agricultural biogas plant should be preceded by public consultations. Concerns most often concern odors and substrate transport. Maintaining good operating practices and appropriate safeguards minimizes this problem.
A thorough transport analysis and professional installation minimize potential inconvenience.
Biogas plant capacity and selection of installation for the farm
The choice of biogas plant capacity depends primarily on the amount of available substrates. If 10,000 tons of biomass are available annually, the plant should be designed to efficiently process the entire material stream.
Based on the methane potential of the substrates, it is possible to estimate the amount of methane produced and then the electrical power of the cogeneration unit.
Profitability of an agricultural biogas plant and sources of income
Revenues from biogas plants include:
sale of electricity,
heat sales,
sale of digestate,
fees for disposal of organic waste.
Although the construction of an agricultural biogas plant is a capital-intensive investment, the payback period is usually only 5–9 years, depending on the technology, substrates, location and connection conditions.
Summary – is an agricultural biogas plant a profitable investment?
Agricultural biogas plant is a stable, controllable source of renewable energy that supports agriculture, improves energy security and reduces greenhouse gas emissions.
If you'd like to determine whether a biogas installation would be profitable for your farm, contact us. We'll analyze the substrate potential, technical options, and available funding, and prepare a customized investment plan.