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민달기 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.3
This paper is a research on the end-of-waste (EoW) criteria of steel scrap. Government strengthens the management of the scrap recently, as pollution has been raised due to the improperly treated steel scrap. In this study, current status of steel scrap recycling was investigated through field survey in 2012, and classification and recycling standard of steel scrap in developed countries and institutions were investigated through literature survey in order to introduce optimal EoW criteria. As a result, contents of contaminants were selected as the most important recycling standards, and contents of contaminants in steel scrap was measured less than 0.5% in most of companies, but only one recycling company showed 10% of contaminants. EoW criteria for steel scrap was determined to be below 2% of contaminants. In this study, contaminants in steel scrap was defined as hazardous and pre-treated substances, considering the Korean industrial standards (KS). And EoW stage was determined by considering the regulation on resources and practices in field.
민달기 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.7
At present red mud didn't recognized as recyclable resources because of large generation and some problems such asimpermeability, high pH value, aluminium leachate, and causing red water in Korea. In order to recognized as recyclableresources, therefore, we suggest the policy proposals were suggested by reducing the above mentioned problems. In 'WasteManagement Act' similar inorganic sludge which has similar characteristics with red mud is regulated land treatment bymixing with general soil, so red mud should be treated in the same method in order to promote the permeability. Redmud should be neutralized because its pH is very high. It should be careful in neutralized operation because of red watergenerated from red mud. It may be suspected that the red water is contaminated un aesthetic point. To reduce the strengthof red water, red mud is treated to a magnetic process in order to recover the magnetic ferrous material. Through thismagnetic process, ferrous material could be recovered 20 thousand ton per year, and the color intensity reduced to 77.3%.