Footnote
(Note 1) aeration: Infusing air components (e.g. oxygen) into liquid by bringing the liquid into contact with air. (Source: Ministry of the Environment, Septic Tank website)
Purifying Lakes by Supplying Highly Oxygenated Water
DAIEI THA CO., LTD.
Industry: Manufacturing
| Publication date | July 1, 2021 (Posted on July 8, 2022) |
|---|---|
| Sector | Water Environment / Water Resources |
Company Overview
DAIEI THA CO., LTD. is a manufacturer of environmental devices such as the "Oxygen Fighter," a high-concentrated gas dissolution device that was created based on a reversed concept of the aeration method. As engineers who are trying to coexist with the environment, we address water environment issues in a variety of fields, including river and lake purification, agriculture, fisheries, livestock wastewater, and industrial wastewater treatment, both within and outside of Japan.
Climate Change Impacts
Deterioration of water quality in rivers, lakes and marshes, which are becoming increasingly anoxic, has adverse effects on the ecosystem of the water environment, as well as health risks due to bad odors. When water temperature rises due to the effects of climate change, the oxygen dissolution rate drops, causing further deterioration of water quality.
Adaptation Initiatives
Oxygen Fighter, our high-concentrated gas dissolution device, facilitates water purification by dissolving a large amount of gas into water, which is a revered concept of the conventional aeration (Note 1) method (Figure 1). In the case of oxygen, the dissolution efficiency is 4.8 times higher than that of aeration (Figure 2). Since the oxygen is dissolved without bubbles, there is no loss, and the dissolved oxygen can be spread to the bottom of the water. In rivers, lakes, and marshes where pollution has accumulated, increasing dissolved oxygen concentration at the bottom of the water will promote the activity of aerobic microorganisms, thereby promoting purification through the food chain.
Case Study in Vietnam
As part of a project to develop markets in emerging countries by the Ministry of Economy, Trade and Industry (METI), we conducted a purification test for Lake Tinga in Haiphong City, Vietnam (Figures 3 and 4). A large amount of wastewater from the adjacent residential and commercial facilities flowed into the lake, causing problems such as the occurrence of blue-green algae, putrid odor, and anaerobic mud due to poor oxygenation.
Effects / Expected Benefits
The introduction of this system is expected to promote purification by restoring the original natural food chain (ecosystem) through microbial activity under a continuous and stable supply of oxygen, and by creating a healthy water environment.
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