- The trial began in February 2025 and targets commercialization in 2027.
- The system uses a pressure vacuum swing adsorption process and zeolites to separate CO2 and methane.
- Biomethane production achieved 99.5% yield and 97% purity.
- The demonstration was conducted at the Kojima Sewage Treatment Plant in Kurashiki City.
Demonstration Trial
Asahi Kasei has completed a demonstration trial of a biogas purification system in Kurashiki, Japan. The trial, which began in February 2025, achieved biomethane production with a yield of 99.5% and purity of 97%. The company aims for commercialization by 2027 and is actively seeking global licensing partners.
Technological Innovation
The system utilizes a pressure vacuum swing adsorption (PVSA) process and a novel zeolite adsorbent to separate CO2 and methane from biogas. This configuration effectively removes CO2, resulting in high-purity biomethane. Zeolites, crystalline aluminosilicates, play a crucial role due to their regular pores and high specific surface area.
Global Context
Biomethane is gaining attention as a sustainable energy source, with 159 countries having signed the Global Methane Pledge to reduce methane emissions. Biomethane can leverage existing natural gas infrastructure, supporting a circular economy by reducing waste and providing usable energy. Demand is particularly strong in Europe for gas pipeline use and bio-CNG conversion, while India promotes biogas to address urbanization challenges.
Operational Success
The demonstration at the Kojima Sewage Treatment Plant used biogas from sewage sludge. Continuous operation over a month confirmed biomethane purity over 97%, suitable for natural gas pipelines or CNG. The high yield of over 99.5% indicates successful performance in achieving both high purity and yield, overcoming a significant technical challenge.
