Asahi Kasei and Kurashiki City celebrated the opening of a biogas purification system early February. This system, located at the Kojima Sewage Treatment Plant in Kurashiki, Okayama Prefecture, Japan, uses Asahi Kasei’s CO2 separation technology with zeolites to enhance biogas processing. The collaboration aims to evaluate how effectively the system performs in real-world conditions.
At the heart of the purification system is a combination of zeolite as an adsorbent and pressure vacuum swing adsorption (PVSA) technology. The zeolite material features channels and cavities designed to capture CO2 efficiently. Asahi Kasei’s PVSA technology allows for effective gas separation, enabling high-purity methane gas (biomethane) to be extracted.
Biogas typically consists of about 60% methane and 40% CO2. It offers significant potential as a carbon-neutral fuel. Its use is increasing globally, especially in Europe and the U.S., where biomethane can substitute for natural gas.
The new system at the Kojima Sewage Treatment Plant will use biogas generated from sewage sludge. If the CO2 separated by the system can be utilized or stored, it could contribute to carbon capture, utilization, and storage (CCUS). This advancement is essential for achieving a carbon-negative outcome. During the trial, the purified methane will be returned to fuel electricity generation, maximizing the benefits of biogas.
Both partners expect the system to be commercialized by around 2027. This will follow further trials in regions where biogas purification is relevant.
Osamu Matsuzaki, a Senior Executive Officer at Asahi Kasei, expressed enthusiasm for the project. He said, “We are excited to start the on-site demonstration trial of our biogas purification system.” He believes that global partnerships will help accelerate the practical application of this technology. This will ultimately aid in reducing environmental impacts and fostering sustainability worldwide.
