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211.
Behavior of metals in ash melting and gasification-melting of municipal solid waste (MSW) 总被引:9,自引:0,他引:9
In this study, metal behavior in ash-melting and municipal solid waste (MSW) gasification-melting facilities were investigated. Eight ash-melting and three MSW gasification-melting facilities with a variety of melting processes and feedstocks were selected. From each facility, melting furnace fly ash (MFA) and molten slag were sampled, and feedstock of the ash-melting processes was also taken. For the ash melting process, the generation rate of MFA was well correlated with the ratio of incineration fly ash (IFA) in feedstock, and this was because MFA was formed mostly by mass transfer from IFA and a limited amount from bottom ash (BA). Distribution ratios of metal elements to MFA were generally determined by volatility of the metal element, but chlorine content in feedstock had a significant effect on Cu and a marginal effect on Pb. Distribution ratio of Zn to MFA was influenced by the oxidizing atmosphere in the furnace. High MFA generation and distribution ratio of non-volatile metals to MFA in gasification-melting facilities was probably caused by carry-over of fine particles to the air pollution control system due to large gas volume. Finally, dilution effect was shown to have a significant effect on metal concentration in MFA. 相似文献
212.
Material and heavy metal balance in a recycling facility for home electrical appliances 总被引:6,自引:0,他引:6
Collection and recycling of home electrical appliances was started in Japan in 2001 under a new recycling law. The law is aimed at promoting material recycling and at reducing the amount of waste to be landfilled. End of life products are processed by manual disassembly, shredding, and separation in 38 recycling facilities. The authors conducted a questionnaire survey and interviewed at some facilities to obtain information on process flow and material balance. By using the detailed records offered by one facility and by estimating the composition of recovered components, the material balance in the facilities was determined for four typical recycling processes. The heavy metal content of the recovered components was analyzed, then metal flow in the process was determined for each scenario. As a result, it was concluded that emissions to the environment of most heavy metals have been substantially reduced by the new recycling system, while a modest improvement in the rate of material recovery has been achieved. 相似文献
213.
Pankaj?KumarEmail author Sho?Iwagami Liu?Yaping Makato?Mikita Tadashi?Tanaka Tsutomu?Yamanaka 《The Environmentalist》2011,31(4):358-363
The hydrochemical study of the surface water along with land-use/land-cover study of its catchment area is useful for determining
its suitability for support to aquatic ecosystem and agricultural purposes. The surface water quality around the wetland in
Sugadaira region, Japan, is being affected both by complex hydrogeochemical processes and by anthropogenic activity, mainly
intensive agricultural practices. Statistical analysis was carried out in this study using surface water chemistry data to
enable hydrochemical evaluation of the water quality based on the ionic constituents, water types, and factors controlling
water quality. Results show that the general trend of various ions was found to be Ca2+ > Mg2+ > Na+ > K+ and HCO3
− > NO3
− > SO4
2− > Cl−. Spatial distribution of water chemistry shows that enrichment of NO3
− has taken place along one side of the wetland that is exposed directly to human settlement and agricultural practices. This
study is vital considering that pollution in a wetland indicates that poor health of water resources in the region not only
makes the situation alarming but also calls for immediate attention. 相似文献
214.
Mandour Ahmed S. Elsayed Roushdy F. Ali Asmaa O. Mahmoud Ahmed E. Samir Haney Dessouki Amina A. Matsuura Katsuhiro Watanabe Izumi Sasaki Kazuaki Al-Rejaie Salim Yoshida Tomohiko Shimada Kazumi Tanaka Ryou Watanabe Gen 《Environmental science and pollution research international》2021,28(7):7815-7827
Environmental Science and Pollution Research - Copper deficiency (CuD) is a common mineral disorder in ruminants, which causes histomorphological changes in the heart due to disturbances in... 相似文献
215.
Zhang Xiaoxi Shinozuka Machiko Tanaka Yuriko Kanamori Yuko Masui Toshihiko 《Environment, Development and Sustainability》2022,24(4):5614-5640
Environment, Development and Sustainability - Many information and communications technology (ICT) services have become commonplace worldwide and are certain to continue to spread faster than... 相似文献