The Experts below are selected from a list of 8637 Experts worldwide ranked by ideXlab platform
Masato Yamada - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the ecotoxicity of solid wastes using rapid leaching test and bioassays
Journal of Environmental Science and Health Part A-toxic\ hazardous Substances & Environmental Engineering, 2008Co-Authors: Ryo Shoji, Hidenari Nakayama, Yasuyuki Sakai, Shino Mohri, Masato YamadaAbstract:A rapid leaching test (RLT) involving the use of ultrasonic irradiation was developed. The applicability and suitability of different leaching procedures for solid wastes were evaluated in terms of the Leached Concentration of heavy metals and total organic carbon and the ecotoxicity potential of the solid wastes. Solid wastes, including incineration ash and sludge, were used. We performed the RLT and the Japanese standard leaching test (JLT-13) to evaluate the ecotoxicity of the solid wastes. The leaching test samples were analyzed using 3 different bioassays. A higher Concentration of heavy metals was obtained by the RLT than by JLT-13. The Concentrations of organic compounds Leached by the RLT correlated well with those of the organic compounds Leached by JLT-13. These results indicate that the RLT developed in this study is a useful method to estimate the leachability of heavy metals and organic compounds in solid waste samples. Although the 50% effective Concentration (EC(50)) values of the RLT and JLT-13 solid waste eluates derived by a human cell-based bioassay were slightly different, the EC(50) values of these eluates derived by 2 other ecotoxicity tests correlated well.
Eunik Yang - One of the best experts on this subject based on the ideXlab platform.
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characteristics of volume change and heavy metal leaching in mortar specimens recycled heavyweight waste glass as fine aggregate
Construction and Building Materials, 2018Co-Authors: So Yeong Choi, Yoon Suk Choi, Eunik YangAbstract:Abstract Industrial waste, such as heavyweight waste glass, has become a global concern in terms of environmental safety and resource recycling. The reuse and recycling of heavyweight waste glass are necessary from the viewpoint of environmental protection. At the same time, concrete, three-quarters of which consists of aggregate, is one of the most widely used infrastructure materials, and it is being exhausted. The heavyweight waste glass being is considered as the most suitable substitute for aggregate due to its physical characteristics and chemical composition. In this study, to evaluate whether heavyweight waste glass could be as a concrete material, we carried out drying shrinkage, expansion by alkali-silica reaction (ASR) and heavy metal leaching of mortar. We found that when the heavyweight waste glass substitution ratio increased, the drying shrinkage decreased. Furthermore, the existing models predicted the experimental results, inversely. However, the expansion of ASR mortar gradually increased with an increase in the substitution ratio of heavyweight waste glass. When fly ash 20% or blast furnace slag 50% was mixed in mortar specimens, the ASR expansion could be controlled within the permitted limit of 0.1% at 14 days by the ASTM 1260 criteria. Moreover, the Leached Concentration of As, Cd, Cu and Hg from the mortar were detected below the criteria specified in drinking water regulatory levels, however, further investigation is needed to determine the leaching characteristics of Pb and Cr according to heavyweight waste glass substitution ratio in mortar specimens. Conclusively, the overall test results of this study have demonstrated that it may be feasible to utilize heavyweight waste glass as fine aggregate in mortar specimens.
Ryo Shoji - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the ecotoxicity of solid wastes using rapid leaching test and bioassays
Journal of Environmental Science and Health Part A-toxic\ hazardous Substances & Environmental Engineering, 2008Co-Authors: Ryo Shoji, Hidenari Nakayama, Yasuyuki Sakai, Shino Mohri, Masato YamadaAbstract:A rapid leaching test (RLT) involving the use of ultrasonic irradiation was developed. The applicability and suitability of different leaching procedures for solid wastes were evaluated in terms of the Leached Concentration of heavy metals and total organic carbon and the ecotoxicity potential of the solid wastes. Solid wastes, including incineration ash and sludge, were used. We performed the RLT and the Japanese standard leaching test (JLT-13) to evaluate the ecotoxicity of the solid wastes. The leaching test samples were analyzed using 3 different bioassays. A higher Concentration of heavy metals was obtained by the RLT than by JLT-13. The Concentrations of organic compounds Leached by the RLT correlated well with those of the organic compounds Leached by JLT-13. These results indicate that the RLT developed in this study is a useful method to estimate the leachability of heavy metals and organic compounds in solid waste samples. Although the 50% effective Concentration (EC(50)) values of the RLT and JLT-13 solid waste eluates derived by a human cell-based bioassay were slightly different, the EC(50) values of these eluates derived by 2 other ecotoxicity tests correlated well.
So Yeong Choi - One of the best experts on this subject based on the ideXlab platform.
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characteristics of volume change and heavy metal leaching in mortar specimens recycled heavyweight waste glass as fine aggregate
Construction and Building Materials, 2018Co-Authors: So Yeong Choi, Yoon Suk Choi, Eunik YangAbstract:Abstract Industrial waste, such as heavyweight waste glass, has become a global concern in terms of environmental safety and resource recycling. The reuse and recycling of heavyweight waste glass are necessary from the viewpoint of environmental protection. At the same time, concrete, three-quarters of which consists of aggregate, is one of the most widely used infrastructure materials, and it is being exhausted. The heavyweight waste glass being is considered as the most suitable substitute for aggregate due to its physical characteristics and chemical composition. In this study, to evaluate whether heavyweight waste glass could be as a concrete material, we carried out drying shrinkage, expansion by alkali-silica reaction (ASR) and heavy metal leaching of mortar. We found that when the heavyweight waste glass substitution ratio increased, the drying shrinkage decreased. Furthermore, the existing models predicted the experimental results, inversely. However, the expansion of ASR mortar gradually increased with an increase in the substitution ratio of heavyweight waste glass. When fly ash 20% or blast furnace slag 50% was mixed in mortar specimens, the ASR expansion could be controlled within the permitted limit of 0.1% at 14 days by the ASTM 1260 criteria. Moreover, the Leached Concentration of As, Cd, Cu and Hg from the mortar were detected below the criteria specified in drinking water regulatory levels, however, further investigation is needed to determine the leaching characteristics of Pb and Cr according to heavyweight waste glass substitution ratio in mortar specimens. Conclusively, the overall test results of this study have demonstrated that it may be feasible to utilize heavyweight waste glass as fine aggregate in mortar specimens.
Hidenari Nakayama - One of the best experts on this subject based on the ideXlab platform.
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evaluation of the ecotoxicity of solid wastes using rapid leaching test and bioassays
Journal of Environmental Science and Health Part A-toxic\ hazardous Substances & Environmental Engineering, 2008Co-Authors: Ryo Shoji, Hidenari Nakayama, Yasuyuki Sakai, Shino Mohri, Masato YamadaAbstract:A rapid leaching test (RLT) involving the use of ultrasonic irradiation was developed. The applicability and suitability of different leaching procedures for solid wastes were evaluated in terms of the Leached Concentration of heavy metals and total organic carbon and the ecotoxicity potential of the solid wastes. Solid wastes, including incineration ash and sludge, were used. We performed the RLT and the Japanese standard leaching test (JLT-13) to evaluate the ecotoxicity of the solid wastes. The leaching test samples were analyzed using 3 different bioassays. A higher Concentration of heavy metals was obtained by the RLT than by JLT-13. The Concentrations of organic compounds Leached by the RLT correlated well with those of the organic compounds Leached by JLT-13. These results indicate that the RLT developed in this study is a useful method to estimate the leachability of heavy metals and organic compounds in solid waste samples. Although the 50% effective Concentration (EC(50)) values of the RLT and JLT-13 solid waste eluates derived by a human cell-based bioassay were slightly different, the EC(50) values of these eluates derived by 2 other ecotoxicity tests correlated well.