Asahi Kasei will build a biogas purification system at sewage treatment plant in Kurashiki, Okayama, Japan.

The multinational company has signed an agreement with Kurashiki City to conduct a trial to assess and demonstrate the functioning of the biogas purification system at the sewage treatment plant.

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The Kojima Sewage Treatment Plant is located at Kurashiki in Japan’s Okayama Prefecture.

This latest agreement comes after the Mizushima Works of Asahi Kasei’s Production Center and Kurashiki City agreed on a partnership for the realisation of carbon neutrality in society.

The biogas purification system refines high-purity methane gas (biomethane) by eliminating CO2 from biogas using Asahi Kasei’s adsorbent, K-GIS zeolite, which adsorbs carbon dioxide selectively.

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K-GIS zeolite, unlike other adsorbents, adsorbs nearly no methane, which in turn allows the system to separate and recover high-purity methane and CO2.

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Electricity in Kurashiki City is produced using biogas obtained from sewage sludge at the Kojima Sewage Treatment Plant.

For the demonstration trial, the system will use a part of the biogas from the treatment plant.

Fabrication of the equipment is slated for November 2022, with its installation to commence in May 2023.

The system will start operation at the end of 2023.

Asahi Kasei will be responsible for designing, installing, and operating the system, and assessing and demonstrating its performance.

Commercialisation of the system is anticipated around 2025 or 2026 after additional trials in countries or regions where biogas purification is undertaken.
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Image: For the demonstration trial, the system will use a part of the biogas from the treatment plant. Credit: kubinger from Pixabay .