CLEWA is combined with technologies of ultrafine bubble generator, UV light, and photo-catalyst, which can generate hydroxyl radicals (•OH) to decompose pollutant in wastewater. By using UV light and photo-catalyst, ozone will be produced and it will be induced into the reactor by ultrafine bubble generator. Therefore, the effect of ozone can be increased.
In this system, the pollutant will be decomposed into less toxic substances, or water and carbon dioxide. The advantages of using CLEWA is that photo-catalyst is capable of reuse. Also, ozone and UV can degrade various substances contained in the wastewater. Furthermore, the remained ozone will convert into oxygen without second contamination. After all, it is an environmentally friendly way to treat wastewater and it is a new trend of water treatment in the future world.