We’re continuing our three-part blog series ahead of InterAqua 2026, taking place at Tokyo Big Sight from January 28th to 30th.
In this series, we introduce the three water treatment systems that will be showcased at our booth.
In this second installment, we’re featuring our Degassing and Aeration System, demonstrated using the NAGASEP Test Module.
Controlled Oxygen Management for Water Treatment
Water in contact with the atmosphere typically contains around 8 ppm of dissolved oxygen under saturated conditions. In many water treatment processes, precise control of dissolved gases—both removal and reintroduction—is essential.
This system demonstrates how dissolved oxygen can be efficiently removed and reintroduced using silicone hollow fiber membrane technology.
How the System Works
The system consists of a degassing module, an aeration module, and an oxygen enrichment process working together in a continuous flow:
- Green tank on the left: Water containing approximately 8 ppm of dissolved oxygen is pumped into the degassing module (Model: M40-A).
- Blue tank on the right: inside the module, pressure is reduced by a vacuum pump. As the water passes through the silicone hollow fiber membranes, dissolved oxygen is removed, reducing the concentration to 1 ppm).
- The degassed water is then pumped into the aeration module (Model: M40-B), where oxygen-enriched air (30% O₂) is supplied. Oxygen permeates through the membrane, increasing the dissolved oxygen level back to 8 ppm.
At the same time, ambient air (21% O₂) is fed into the oxygen enrichment module. Under reduced pressure, oxygen selectively permeates through the hollow fiber membranes, producing oxygen-enriched air. The oxygen concentration is monitored by the oxygen analyzer located at the center of the system, and the enriched air is then supplied to the aeration module.
See the System in Action
This exhibit highlights how membrane-based degassing and aeration can provide precise, energy-efficient dissolved gas control for water treatment applications.
We invite you to visit our booth and see the system operating live at the exhibition.
Visit Us at InterAqua 2026
Dates: January 28–30, 2026
Venue: Tokyo Big Sight
Booth: 2S-T14
