Supplying all three primary technologies

As the only company to offer the three primary biogas upgrading technologies we are in a unique position to offer you the best solution: whatever your upgrading needs. We can design a system using either one or all three technologies that will be totally tailored to your needs.


The most cost efficient and environmentally friendly process.

Water-wash (or water-scrubbing) is the technology for which Greenlane is world famous. With 30 years’ experience and 100 sites operational worldwide, we are ‘pioneers’ in this space.

Water-wash, which is a safe, reliable and proven technology is the most environmentally friendly, using no chemicals or heat. In addition it is a highly efficient upgrading process for medium, large and ultra large projects and where planning permission for the water towers is not an issue. It is ideal when the end use is grid injection.

From the gases produced in the anaerobic digester (AD), landfill site or water treatment plant, carbon dioxide, (CO2) and hydrogen sulphide, (H2S), are separated from the methane (CH4) under pressure and absorbed into water, the methane is not absorbed and passes into the drier. After upgrading the methane content can be as high as 98%.

At the heart of the facility a simple, robust, reliable compressor to ensure a high availability of biogas which in turn contributes to greater efficiency and therefore lower operating costs.

The advantages:

  • No heat requirement
  • No chemicals
  • Less than 1% methane slip
  • H2S tolerance with no separate pre-wash required – even for high levels
  • New, improved layout and access to key components
  • Most reliable compression technology
  • Modular design gives scalable capacity
  • Can work in conjunction with other upgrading systems

Most suitable projects for water-wash

Water-wash technology works well where there is a reliable feedstock, such as food manufacturing, distilleries, food waste processors and wastewater treatment.

The largest range of upgraders anywhere!

All the models in the range are of standard modular, plug-and-go design, with a compact footprint. Each operates successfully within a wide biogas flow-rate band. Greenlane has the largest range of model sizes in the market with standard plant models from 100 to 5,000 Nm3/hr. Larger capacities are achieved with multiple systems installed in parallel.




Best for complex feedstock

Pressure Swing Adsorption (PSA) is an effective method of gas separation, particularly where a complex mixture of gases are generated from the feedstock, or where there is high humidity – such as landfill sites. Under high pressure, different gases are attracted to different solid surfaces, or "adsorbed". The higher the pressure, the more gas is adsorbed; when the pressure is reduced, the gas is released, or desorbed.

Following initial desulphurisation the PSA processes can be used to separate the mixed gases as different gases are adsorbed on different surfaces. Changing the pressure allows oxygen (O2), nitrogen (N) and carbon dioxide (CO2) to be trapped by the adsorbants, resulting in a continuous output of high-purity biomethane of at least 97%.

The PSA system also effectively removes hydrogen sulphide (H2S) and in addition to other systems is able to recover the CO2 to use as a by-product.

Working with our partner Sysadvance, the PSA system we offer is fast and efficient in regenerating the adsorbing agents at the heart of the system. The whole process uses very little power and is capable of high throughput rates of up to 3,000 Nm3/hr.

The PSA process integrates very effectively with water-wash systems providing solutions on projects that either system alone can’t. The units are easily installed in any indoor facility and have a wide range of applications in the food, pharmaceutical, chemical, automotive, medical and wastewater treatment industries.

The advantages:

  • Particularly suitable for biogas from landfill sites
  • Potential to reuse CO2
  • Efficient removal of oxygen and nitrogen
  • Produces higher added value biomethane compared to biogas used for Combined Heat and Power (CHP)
  • Modest visual impact


Our membrane upgrading plants incorporate the latest generation of membrane technology

Membrane is a newer and fast developing method of upgrading biogas where straw like fibres separate carbon dioxide (CO2) and other compounds from methane (CH4) using the principle of permeation. This process delivers a high methane yield of up to 99%. Membrane designs are best suited to small to medium sized projects where CAPEX is considered most important, compared to long-term lifecycle costs.

Our membrane package design is elegant and compact. A limited number of standard components are employed and can be readily configured according to project requirements.

As with our market leading water-wash system, our membrane system is designed and engineered by us and the process is scalable to meet the required design gas throughput rates.