Biogas processing systems and methods

A method of processing a biogas, the method comprising:

• providing, through an inlet, biogas to a pressure swing adsorption (PSA) unit housed in a container, the PSA unit having a plurality of beds containing adsorbent material, the adsorbent material configured to selectively adsorb gas species, and a rotary valve module for distributing flow of the biogas within the PSA unit;
• operating the rotary valve module to selectively permit biogas to contact the plurality of beds to process the biogas;
• and
• permitting the processed biogas to flow, through an outlet, from the PSA unit, wherein the PSA unit comprises a first PSA unit and a second PSA unit.

A system for processing biogas, the system being modular and comprising:

• a container comprising a first compartment and a second compartment fluidly sealable from one another;
• a pressure swing adsorption (PSA) unit module removably housable in the first compartment of the container, the PSA unit module comprising a PSA unit in a housing, the PSA unit comprising a plurality of beds containing adsorbent material, the adsorbent material configured to selectively adsorb gas species from the biogas to process the biogas;
• and
• at least one flow path for the biogas from an inlet to the PSA unit module and to an outlet.

A system for processing biogas, the system comprising:

• a container;
• a pressure swing adsorption (PSA) unit housed in the container, the PSA unit having:
• a plurality of beds containing adsorbent material, the adsorbent material configured to selectively adsorb gas species from the biogas to process the biogas,
• a rotary valve module for distributing flow of the biogas within the PSA unit, an inlet for supplying the biogas to the plurality of beds from outside of the container, and
• an outlet for transporting the processed biogas away from the PSA unit;
• and
• one or both of (i) a pre-treatment assembly for pre-treating the biogas before supplying the biogas to the PSA unit, and a (ii) post-treatment assembly for treating a product gas from the PSA unit, the pre-treatment assembly and/or the post-treatment assembly arranged to remove one or more of:
• hydrogen sulfide, volatile organic compounds, siloxanes and water, wherein at least some of the components of the pre-treatment assembly and/or the post-treatment assembly are arranged to be positioned outside of the container and fluidly connected to the PSA unit through the container.