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Maximum efficiency for biogas-to-RNG upgrading and optimization of energy consumption.

BIOCH4NGE® is the AB solution for biogas-to-RNG upgrading through a membrane system: flexibility, scalability and low energy consumption for a real competitive advantage.

The operating process of BIOCH4NGE® starts with purifying the biogas coming from the anaerobic digestor, loaded with water and pollutants. The filtered and dehumidified gas is compressed, cooled and sent to the next treatment step.

By passing through a bed of activated charcoal, the biogas is purified of the pollutants. The charcoal configuration, in the "Lead-Lag" version, includes a series of valves that allow the inversion of flows, the bypass and the sectioning of the single filter, thus ensuring flexibility, reliability and continuity of service.

The pretreated and purified biogas is ready for the actual upgrading, i.e. the separation of methane from carbon dioxide. The process is optimized in terms of consumption and allows obtaining a biomethane with the desired characteristics for different uses, maximizing the recovery efficiency of CH₄ from the biogas.

BIOCH4NGE: Discover all the details of the product in the 3D rendering video

Thanks to the use of advanced technologies, BIOCH4NGE® guarantees high performance with low energy consumption.

Among the available RNG upgrading technologies, AB has chosen the membrane system, the most widespread and used in the world. The membranes are made up of particular polymeric materials that have a selective permeability for separating CH₄ and CO₂.

The pretreated gas is compressed in several phases and sent to different stages of membranes in order to optimize their operation and to ensure scalability. Two stages in series ensure compliance with network specifications while a third stage is dedicated to optimizing the recovery of methane and at the same time to limiting its emission into the atmosphere.

Thanks to the independent compression management, the control system is able to modulate the operating pressures of the separation stages and guarantee the required performance with the lowest possible energy consumption. The process takes place without intermediate stages and without the use of chemicals or consumables.

The high flexibility given by the operation, adjustable even with a partial load, combines with the economic savings related to the system, even for medium-small sizes.


Industrial product

BIOCH4NGE® is entirely designed and manufactured by AB and is pre-assembled and tested in our production facilities before shipping.

Modular outdoor solution

BIOCH4NGE® is a solution designed to be installed outside and is available in different sizes, guaranteeing the highest application modularity.


Extremely compact, BIOCH4NGE® has been engineered in every way in order to optimize dimensions and simplify maintenance operations.

Plug & play

Plug & play installation to limit construction work and takes place inside contained spaces.


BIOCH4NGE® complies with the requirements for quality of the gas produced and of the gas emitted into the atmosphere; combined with AB secondary systems, it ensures complete zeroing of CH₄ emissions.

Remote control

BIOCH4NGE®is equipped with a centralized monitoring and supervision system, developed and managed by AB, which allows remote control of all plant parameters and of the connected production processes.

Full service

AB provides a "full-service" post-sales maintenance service which provides 24-hour assistance for 365 days a year, remote monitoring of the system and availability of original spare parts.


BIOCH4NGE® fits perfectly with AB cogeneration plants such as ECOMAX®, thus creating a complete and totally sustainable energy system.

AB’s offer for the upgrading of biogas in biomethane

BIOCH4NGE® is available in standardised units from 50 to 1,500 Nm³/h, complete with pre-treatment systems that can be used with existing biogas plants and integrated with possible extensions linked to the liquefaction of gas and the exploitation of CO₂. Solutions of different sizes can be “tailor-made”.

Discover the range of BIOCH4NGE® solutions


Biogas-to-RNG upgrading

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