Renewable Gas Treating

Renewable Gas Treating

We completed construction of our first renewable natural gas plant in 2000, and since then, we’ve developed 20 raw biogas-to-high-BTU plants that meet or exceed virtually every industry standard. We specialize in renewable gas treating, landfill gas collection, compression, treatment, and NSPS compliance assistance, and there’s no biogas project we can’t handle.

To remove unwanted components in landfill gas streams such as CO2, H2S, water, and heavy hydrocarbons, Morrow-built plants utilize SELEXOL™. Being a physical solvent, SELEXOL™ is able to treat all trace elements with a methane efficiency of at least 98%. SELEXOL™ treating requires less compression compared to other treating methods, and therefore lowers operating and maintenance costs. Morrow has received two patents in biogas treating, both centered around the regeneration of SELEXOL™ in landfill gas scenarios.


Amine is a regenerative, water-based solvent that chemically removes CO2 and H2S from digester gas streams using a contactor. The first cow manure-to-pipeline gas plant of its kind in the United States was designed and built by Morrow, including the amine plant, compression, pipeline, and interconnect piping. Amine treating results in a high methane recovery efficiency (~99.9%), and operates at a low pressure of 10 psig. Furthermore, using an amine system for digester gas treating can greatly reduce heat costs. Up to 80% of the heat used to regenerate amine can be transferred to heating the digester itself.

Digester Applications

Morrow offers several different options for H2S treating. We build vessel packages designed for any non-regenerable solid media scavengers with lead/lag configurations for maximum efficiency and zero downtime for changeouts. We design skids for non-regenerable liquid media scavengers for easy operation, minimal pressure drop, and low-cost changeouts. For higher concentrations of H2S or higher flow rates, Morrow offers a regenerable liquid treating package with minimal ongoing operating costs.

H2S treating

Morrow builds cryogenic Nitrogen Rejection Units. Utilizing the principle of separation by boiling point, these NRUs operate at a 99.9% methane efficiency. When paired with a Morrow C02 treating plant, the total methane efficiency can be above 96%.


We’ve Completed Over 40 RNG Projects. Now Let’s Talk About Yours.

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