Abstract
Environmental application of recycled products is indispensable to recycling-oriented society. For historical reasons, recycled products and soil have been discriminated. In fact, many cases to reuse recycle products have adopted the same criteria as the Soil Concentration Countermeasures Law. As long as recycled products and soil to be distinguished, risk assessment should be made for recycled products instead of applying a similar soil contamination risk assessment. In this study, for risk assessment of recycle products the application of clearance level scenario was examined. Products to apply clearance levels are commercial ones under controlled. Steel slag are also controlled. It is considered that Steel slag can be applied clearance levels scenario from usage. In order to reduce energy consumption in steel slag production, fluorine is added to enhance the fluidity of the slag and lower the temperature. It is also has possibility to reduce the CO2 emission during the process. Results of the review showed that reference value of Soil Contamination Countermeasures Law have become excessive risk assessment for the use of Steel slag. When applying clearance level scenarios, intake amount of fluorine from steel slag to local residents is 1/10~1/100 by comparison amount of intake the Soil Concentration Countermeasures Law. Excessive risk assessment may impede the industrial development. From the selection of clearance levels as shown in this study, it is necessary to implement a reasonable risk assessment. The recycled products is also possible to use 10 times larger criteria of that of Soil Contamination Countermeasures Law.
