In Japan, there are several lakes, marshes and ponds in a park known as the closed water body. Waterpollution consisting of increased nutrient salts such as phosphorus has become a big problem in the closed water body,causing water quality deterioration thereby posing great threats to the environment.In contrast, combustion waste such as coal fly ash and melted slag has been increasing with increase in coal-fired powerplant and melted plant, hence it is necessary to utilize the combustion waste. Therefore, it is expected that the effectiveutilization of these combustion wastes should be expanded. Some combustion wastes have the effect of phosphorusadsorption, and were indicated to contribute to the improvement of water quality.This study conducted three kinds of tests including soaking test, column leaching test and large scale soaking testsimulating a lake using coal fly ash and melted slag as adsorption materials with the aim of verifying the effect ofphosphorus adsorption to those materials. The study verified the effect of phosphorus adsorption to coal fly ash andmelted slag. It is anticipated that combustion wastes would be utilized as phosphorus adsorption material for theimprovement in water quality.
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