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교반시간 및 입경분포에 따른 순환골재의 pH 농도 특성
강영렬,최민영,전태완,정용우,정성경,신선경 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.8
Using of the recycled aggregates is strongly promoted to use the national resources efficiently and enhance the recycling rate of construction wastes. However, the negative impact is expected by the alkalinity elution characteristic to the water quality and soil ecology in the region where could be contacted by water like ground water, river, area nearby coast, and etc. For this reason, we developed the pH test method to use the recycled aggregate in the drainage layer and analyse the pH concentration of the sort of time change and particle size. By the ‘Korean Standard Method for Waste’, the pH concentration was ranged from 10.78 to 11.72, by the ‘Korean Standard Method for Soil’, the pH concentration was ranged from 10.73 to 11.97, by the developed pH test in this study, the pH concentration was ranged from 10.82 to 11.71. There was no difference in the pH concentration in relation to the stirring time and the spread of particle size.
교반시간 및 입경분포에 따른 순환골재의 pH 농도 특성
강영렬,최민영,전태완,정용우,정성경,신선경 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.8
Using of the recycled aggregates is strongly promoted to use the national resources efficiently and enhance the recycling rate of construction wastes. However, the negative impact is expected by the alkalinity elution characteristic to the water quality and soil ecology in the region where could be contacted by water like ground water, river, area nearby coast, and etc. For this reason, we developed the pH test method to use the recycled aggregate in the drainage layer and analyse the pH concentration of the sort of time change and particle size. By the ‘Korean Standard Method for Waste’, the pH concentration was ranged from 10.78 to 11.72, by the ‘Korean Standard Method for Soil’, the pH concentration was ranged from 10.73 to 11.97, by the developed pH test in this study, the pH concentration was ranged from 10.82 to 11.71. There was no difference in the pH concentration in relation to the stirring time and the spread of particle size.
극저농도의 방사성물질을 함유한 폐기물을 방사성선원 관리에서제외하는 한국과 일본의 법제도 비교
오길종,강영렬,김우일,김용준 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.6
Laws and regulations of radioactive waste management related to the Exemption system and the Clearance systembetween governing authorities in Korea and Japan were investigated to suggest better management of radioactive waste.Above both system, very low levels of radioactive wastes which have negligible risk can be decided on being Exclusionsystem and classified as a non-radioactive waste. As a result, the Exemption systems between two countries were similar,whereas the Clearance systems were different. With regard to laws related to the Clearance, Japan specify providinginformation and feedback among relevant authorities, but there is no specification in Korea. In addition, this study suggeststo develop accredited analysis methods to improve the accuracy and reproducibility of the measurement, because twocountries have not established the national accredited analysis method for determining the concentration of radionuclide.
바이오 복합체 제작을 위한 농업 폐기물 섬유에 과열증기(Superheated Steam) 전처리 방법 적용 가능성에 관한 연구
이희성,전태완,황동건,강영렬,장미정,유혜영,홍수연,박선오,김태희,신선경,안도 요시토 한국폐기물자원순환학회 2016 한국폐기물자원순환학회지 Vol.33 No.1
This study focused on enhancing the mechanical properties and thermal stability of bio-composites with natural agricultural residues and improving the interfacial adhesion between polymer and biodegradable agricultural residual waste fibers. To achieve this purpose, we proposed superheated steam (SHS) treatment method as a novel pre-treatment of fiber for improved of compatibility in polymer matrix. The use of SHS-treatment was investigated as a method for improving interfacial adhesion between agricultural residual waste fibers and polymer and with the goal of enhancing mechanical properties. We selected wheat straw fibers for agricultural waste fibers to improve the surface modification. Wheat Straw Fibers (WSF) was treated with SHS in order to modify its characteristics for bio-composite applications. Treatment was conducted at temperatures 200oC and 230oC for each 1 h. SHS-treated WSF was evaluated for its chemical composition, thermal stability, morphology and crystallinity. Thermal stability of the fibers was investigated using thermogravimetric analysis and found that the degradation temperature of the fibers is increased after of the SHS treatment. In addition, SHS treatment contained in the WSF reduce the rate of hemicellulose components. The WSF is polar nature of lignocellulose due to the presence of hydroxyl and carboxyl groups in cellulose and hemicellulose causes it to be incompatible with non-polar thermoplastics. SHS-treatment was found to be able to remove hemicellulose, which is the most hydrophilic and most thermally unstable component in WSF, since it has the lowest thermal resistance. Removal of hemicellulose makes the fiber less hydrophilic and this will potentially increase the compatibility of treated WSF and polymers and improves the mechanical properties and water resistance of composites.
국내 사업장폐기물에 대한 유해특성 적용성 평가 - 바젤협약의 생태독성(H12)을 중심으로 -
최효현,김우일,엄남일,강영렬,윤철우,김태희,전태완,신선경 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.5
This study evaluated the applications of ecotoxicity for management plan on industrial waste, and suggested the strategy for assessment of the ecotoxicological characteristic. From the results of ecotoxicity for waste synthetic resin, sludge, slag, waste dust, etc. 20 industrial wastes, 15 waste samples were analyzed in ecotoxic. In particular, 8 waste samples (about 62%) among the 13 non-hazardous wastes were confirmed ecotoxic. Therefore, the additional studies are necessary by increasing the number of samples and confirming the various types of waste. The correlation coefficient of arsenic and vanadium was highly estimated that 0.68, 0.44, respectively. The ecotoxicity for wastes should be managed as a comprehensive toxic in the future. Because the wastes has the high potential ecotoxic by the possibility of containing hazardous materials with discharge process and the interaction of heavy metals, ions, salt, and pH and so on. The hazardous characteristic of waste for ecotoxicity should be evaluated through the ecotoxic analysis in 3 steps by the proposed procedure for assessment of ecotoxicological characteristic.