The plan to revive the clear streams of Nagoya, the water city - August 2002

The plan to revive the clear streams of Nagoya, the water city - August 2002

Chubu Electric Power Company, in cooperation with the City of Nagoya, has begun a demonstration experiment aimed at purifying the water quality of the Horikawa River. In this experiment, river water is pumped up, aerated by generating minute air bubbles (0.03 to 0.10 mm in diameter), and then returned to the river. The purpose of this method is to increase the amount of oxygen in the water and improve water quality. Calculations indicate that by generating 24 liters of air bubbles per minute, the oxygen concentration is expected to reach a level where fish can survive after approximately 30 hours. The experiment is scheduled to continue until December 20 of the same year.

Related Information
Water quality improvement technology using microbubbles is also attracting attention in other areas. For example, a demonstration experiment to improve the bottom sediment environment using iron fulvic silica material was conducted on the Seto-cho coastal tidal flat in Imari City, Saga Prefecture, and confirmed a decrease in the amount of organic matter in the bottom sediment. These cases indicate the possibility of water quality improvement through the use of microbubbles and specific materials, and the results of the experiments in Horikawa are also expected to contribute to the future development of water purification technology.