Biogas is a renewable energy source, offering a sustainable solution for waste management and energy generation.
And it’s a fast-growing sector too, with the potential to meet 6-9 % of the world’s primary energy consumption (according to the World Biogas Association). Its growth is being fuelled by increasing demand for renewable energy, stringent environmental regulations, and advancements in technology.
According to the latest market reports, the global biogas market size was valued at USD 48.74 billion in 2023 and is expected to grow from USD 51.03 billion in 2024 to USD 78.32 billion by 2032 at a CAGR of 5.50% during the forecast period. Additionally, the global renewable natural gas (RNG) market is estimated to be valued at USD 14.03 billion in 2024 and is expected to reach USD 24.23 billion by 2031 at a CAGR of 8.1%.
Challenges during biogas production
Biogas is produced through the anaerobic digestion (AD) of organic materials, such as agricultural waste, plant material, food scraps, manure and sewage. The gas primarily consists of methane (CH₄) and carbon dioxide (CO₂), as well as trace impurities including hydrogen sulphide (H₂S), water vapor, and particulates.
However, these impurities pose several issues during the production of biogas, namely:
- Efficiency loss: Impurities reduce the quality of biogas, limiting its effectiveness in energy generation and further processing into Renewable Natural Gas (RNG)
- Equipment damage: Water vapor and solid particles can cause wear and tear on compressors, pipelines, and engines.
- Corrosion: Hydrogen sulphide and moisture can result in corrosion in equipment.
A need for reliable and effective filters
That’s where filters come in. They are essential for ensuring the purity and quality of biogas so that it meets the required standards for use in further processing, as well as addressing the challenges of protecting valuable processing equipment and improving production uptime.
There are a couple of different filters that need to be installed at different points of the biogas production process: coalescing filters, and particulate filters.
Let’s take a look at each filter in greater detail.
What are coalescing filters?
Coalescing filters remove liquid droplets and aerosols from gas streams. They are typically installed before gas compression and are vital for eliminating water vapor, oil, and other liquid contaminants.
- How coalescing filters work: Coalescing filters capture small liquid droplets in a fibrous medium. As the gas flows through the filter, the droplets coalesce (or join) to form larger ones. Gravity can then easily remove these droplets from the gas stream.
- Components: This type of filter typically consists of several layers, including a pre-filter layer to remove large particles, a coalescing layer to merge small droplets, and a drainage layer to collect and remove the coalesced liquid.
Our coalescing filters are designed to provide superior performance and reliability in demanding biogas applications.
What are particulate filters?
Particulate filters remove solid particles from gas streams. They are usually installed in equipment post-compression and these filters are essential for eliminating dust, dirt, and other solid impurities that can cause wear and tear on equipment and reduce the purity of the gas.
- How particulate filters work: Particulate filters use a porous medium to trap solid particles. This prevents them from passing through with the gas stream.
- Components: This type of filter generally includes multiple layers of filtering media, each designed to capture particles of different sizes. The layers can be made from various materials, such as fiberglass, polyester, or cellulose.
Our particulate filters offer high efficiency and durability, making them ideal for biogas production facilities.
Advantages of effective filtration in biogas production
There are many benefits to integrating coalescing and particulate filters in biogas processing systems, including:
- Improved equipment lifespan
These filters remove contaminants, therefore protecting critical components from wear, corrosion, and blockages, and extending the lifespan of machinery. - Reduced maintenance and associated costs
Clean gas streams reduce the frequency of equipment breakdowns and repairs, enabling you to reduce maintenance needs. This lowers operational costs over time (TCO) and ultimately boosts your bottom line. - Enhanced biogas quality
The filters remove impurities, which results in higher-quality biogas with better combustion properties and energy efficiency. - Environmental compliance
Effective filtration helps ensure that biogas production aligns with environmental and safety standards, minimising harmful emissions and waste.
What to look for when specifying a filter for biogas production?
With biogas production only expected to grow, there has never been a more urgent need for effective filtration. But what factors should you look for when considering which filter to use in your process?
There are few aspects you should consider, from understanding the impurities that need removing, the filtration efficiencies and mircon ratings required, as well as pressure drops and whether the filter material is compatible with the biogas stream.
Talking to our experts can help you to select the most appropriate filter for the job. Investing in robust and high-quality filtration not only optimises production but also supports a more sustainable and more efficient energy future. It is essential for continued success and expansion of biogas production facilities worldwide.
Get in touch for more information about our range of filtration products and how they can benefit your biogas production facility.