Two processes. Maximum benefit.

The requirements for upgrading biogas to biomethane or bio natural gas can be very complex. Input materials influence the biogas composition and its mandatory to comply with local gas quality regulations. Furthermore, project specific conditions have to be evaluated. The resulting dependencies are well known for us and we are able to identify the right biogas upgrading technology. This includes an efficient biogas pre-conditioning also removing VOCs as well as the final gas injection facility or in case of vehicle fuel the compression, storage and fuelling infrastructure. We also support you finding the right customer for your biomethane.

Our partner for the plant engineering and service of biogas upgrading plants is the company Friedrich Vorwerk KG from Tostedt, Germany. With over 50 years of experience in pipeline construction and plant engineering Vorwerk founded the biomethane department in 2015 to offer engineering, construction and services for biogas upgrading plants.

Membrane separation – electricity based & flexible

Upgrading biogas using membrane separation is a very dynamic process with a small footprint. The process is adaptable on changing flow-rates and the plant can be started or stopped in short time. Main components are the hollow fibre membranes and the compressor providing the system pressure of 16 bar. The sound design of the gas pre-conditioning system, including the VOC removal, ensures best operating conditions and long lifetime of the membranes.


The membrane separation is a purely electricity based process that provides excess heat from the compressor usable for heating the biogas plant. The compact design makes this technology well suited for small capacities and allows for very short construction and commissioning periods on-site. Also for larger capacities the membrane separation can leverage its strength. The high outlet pressure is ideal for using the produced biomethane as CNG. If requested, we design the matching fuelling station for you as well.


We are looking forward to explaining how to design the gas-conditioning and the membrane separation for your project.

Membrane Compartment
Membrane Compartment
Biogas Pre-conditioning
Biogas Pre-conditioning

Amine scrubbing – heat based & efficient

The unpressurized amine scrubbing is a very robust upgrading process for biogas working without continuous water consumption as a closed process. The carbon dioxide found in the biogas is removed by the amine with a very high selectivity, producing a product gas with highest methane concentrations and an off-gas which is almost pure carbon dioxide. A further characteristic attribute is a very low methane loss of the process which normally does not require any further off-gas treatment. 


The electrical energy consumption of the amine scrubbing is very low. The main energy source is heat for the desorption of the carbon dioxide from the amine. The required heat amount can be supplied by various renewable or conventional energy provided that the temperature level is sufficient. This allows utilizing waste heat from a combined heat and power plant or steam from an industrial process which makes the amine scrubbing perfect for being integrated in existing infrastructure. The majority of the required heat can be extracted afterwards at lower temperature levels to be used for external heating purposes.


How the synergies of the heat based and unpressurized amine scrubbing can be utilized most efficiently for your project is best to be explained in a personal conversation.