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91.
Morihiro Osada Ken Takamiya Kazutaka Manako Masato Noguchi Shin-ichi Sakai 《Journal of Material Cycles and Waste Management》2013,15(1):25-36
The service life of many buildings and houses built using asbestos-containing materials is coming to an end and their demolition will lead to a great deal of asbestos-containing waste (ACW). Conventionally, the disposal of such waste is conducted by isolation under controlled landfill procedures; however problems with this method exist, such as the risk at the time of re-utilization of landfill sites and the depletion of lands to be reclaimed. Melting treatment is a promising technology that could be used to solve these problems; a thermal process involving temperatures exceeding the melting points of asbestos, it transforms them into non-hazardous minerals. This technology may be applicable not only for friable ACW but also for nonfriable ACW. We performed a demonstration test of melting treatment of nonfriable ACW using a gasification and melting furnace of the shaft furnace type, which is a typical method for high temperature melting. Detailed observation using transmission electron microscopy as well as general analyses verified that the same level of asbestos remained in the slag obtained by high temperature melting as that of the background soil. In addition, the asbestos concentration in the exhaust gas and the dust from the facility were at sufficiently low levels, and it was thus verified that the asbestos concentration in the atmosphere in the vicinity of the facility during the melting treatment was comparable to that of Japan’s background level reported by the Ministry of the Environment in 2007. 相似文献
92.
93.
Green rust (Fe(4)(II)Fe(2)(III)(OH)(12)SO(4).3H(2)O) is an intermediate phase in the formation of iron (oxyhydr)oxides such as goethite, lepidocrocite, and magnetite. It is widely considered that green rust occurs in many soil and sediment systems. Green rust has been shown to reduce sorbed Se(VI), Cr(VI), and U(VI). In addition, it is also reported that green rust does not reduce As(V) to As(III). In this study, we have investigated for the first time the interaction between Sb(V) and green rust using XAFS and HPLC-ICP-MS. Most of the added Sb(V) was adsorbed on green rust, and Sb(III), a reduced form, was observed in both solid and liquid phases. Thus, it was shown that green rust has high affinity for Sb(V), and that Sb(V) was reduced to more toxic Sb(III) by green rust despite the high stability of the Sb(V) species even under reducing condition as reported in previous studies. Therefore, green rust can be one of the most important reducing agents for Sb(V), which can influence the Sb mobility in suboxic environments where green rust is formed. 相似文献
94.
Temporal trends and sources of PCDD/Fs, pentachlorophenol and chlornitrofen in paddy field soils along the Yoneshiro River basin, Japan 总被引:1,自引:0,他引:1
Kobayashi J Sakai M Kajihara H Takahashi Y 《Environmental pollution (Barking, Essex : 1987)》2008,156(3):1233-1242
In order to understand the long-term behaviors of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), pentachlorophenol (PCP), and 2,4,6-trichlorophenyl-4′-nitrophenyl ether (chlornitrofen, CNP) in paddy soil, we measured their concentrations in paddy soil samples collected in 1982 and 1984 (1980s) and in 2000 and 2002 (2000s) from the Yoneshiro River basin, Japan. The concentrations of PCP and CNP decreased from the 1980s to the 2000s, whereas the concentrations of PCDD/Fs and their toxic equivalency (WHO2006-TEQ) remained. The major sources of PCDD/Fs in the paddy soil samples were attributed to impurities in PCP and CNP as a result of comparisons of homologue and congener profiles and principal component analysis. Based on the results of comparison of total input and remaining amount, it is estimated that more than 99% of PCP and CNP applied to the paddy fields had disappeared, whereas most of the applied PCDD/Fs and TEQ remained. 相似文献
95.
Shin-ichi Sakai Junya Yano Yasuhiro Hirai Misuzu Asari Ritsuki Yanagawa Takeshi Matsuda Hideto Yoshida Tetsuji Yamada Natsuko Kajiwara Go Suzuki Tatsuya Kunisue Shin Takahashi Keijiro Tomoda Joachim Wuttke Paul Mählitz Vera Susanne Rotter Mario Grosso Thomas Fruergaard Astrup Julian Cleary Gil-Jong Oh Lili Liu Jinhui Li Hwong-wen Ma Ngo Kim Chi Stephen Moore 《Journal of Material Cycles and Waste Management》2017,19(4):1295-1313
Although the 2Rs (reduce and reuse) are considered high-priority approaches, there has not been enough quantitative research on effective 2R management. The purpose of this paper is to provide information obtained through the International Workshop in Kyoto, Japan, on 11–13 November 2015, which included invited experts and researchers in several countries who were in charge of 3R policies, and an additional review of 245 previous studies. It was found that, regarding policy development, the decoupling between environmental pressures and economy growth was recognized as an essential step towards a sustainable society. 3R and resource management policies, including waste prevention, will play a crucial role. Approaches using material/substance flow analyses have become sophisticated enough to describe the fate of resources and/or hazardous substances based on human activity and the environment, including the final sink. Life-cycle assessment has also been developed to evaluate waste prevention activities. Regarding target products for waste prevention, food loss is one of the waste fractions with the highest priority because its countermeasures have significant upstream and downstream effects. Persistent organic pollutants and hazardous compounds should also be taken into account in the situation where recycling activities are globally widespread for the promotion of a material-cycling society. 相似文献
96.
Nguyen Thanh Dien Yasuhiro Hirai Shin-ichi Sakai 《Journal of Material Cycles and Waste Management》2017,19(4):1342-1350
We estimated the in-use stocks of polybrominated diphenyl ethers (PBDEs) in Japan using a population balance model. The estimation is based on the domestic demand of PBDEs and the assumed survival rate of these products. Two cases relevant to the future regulation of commercial deca-BDE are considered, namely (1) deca-BDE declines at the same rate as the current rate of decline, and (2) deca-BDE is discontinued after 2020. The estimates of the decreasing rates of in-use penta-, octa-, and deca-BDE stocks were proportional with the measured decreases in the atmospheric concentrations of these substances. The in-use penta- and octa-BDE stocks could be depleted in the near future (500 and 60 tonne in 2013, and an estimated 20 and <1 tonne in 2020, respectively). Relevant to case 1, the in-use stocks of deca-BDE-containing products would be 28,000 tonne in 2013 and an estimated 1900 tonne in 2040, providing an ongoing source of deca-BDE emission to the environment. On the other hand, relevant to case 2, most of the deca-BDE would be phased out by 2040. The atmospheric emissions of deca-BDE were predicted at 84–841 kg/year in 2013 and an estimated 43–425 kg/year in 2020. 相似文献
97.
Hirofumi Sakanakura Masahiro Osako Akiko Kida Shin-ichi Sakai 《Journal of Material Cycles and Waste Management》2011,13(1):56-67
The objective of this study was to design a procedure for an environmental availability test under both acidic and alkaline
conditions for solid wastes and recycled materials and products. The procedure was designed on the basis of the Dutch availability
test NEN 7371. Bottom ash from a municipal solid waste incinerator and copper slag were used as test materials. The influences
of the type and intensity of liquid stirring apparatus and the open area ratio of the top of the leaching vessel were investigated
experimentally, and partial least-squares modeling was applied as multivariate data analysis for the simultaneous evaluation
of the three leaching conditions. Interlaboratory validation was then carried out with the participation of seven laboratories
in accordance with JIS Z 8402-2/ISO 5725-2. Both repeatability and reproducibility were found to be acceptable, but precise
calibration of the pH electrode is required. The proposed procedure will provide sufficient accuracy as a standard test method. 相似文献
98.
Unit-charging programs for municipal solid waste in Japan 总被引:1,自引:0,他引:1
Unit-charging programs known as pay-as-you-throw (PAYT) for municipal solid waste in Japan were surveyed. The number of municipalities that have implemented PAYT for combustible waste totaled 954 (30%) in 2003. The introduction of PAYT programs peaked in the early 1970s and again in the 1990s. PAYT has tended to be adopted by municipalities with small populations (less than 30,000). PAYT charging systems can be roughly divided into two groups: simple unit-pricing programs and two-tiered pricing programs. It is difficult to see the relationship between PAYT and waste reduction by simple inspection of the overall changes throughout Japan. Case studies of four municipalities showed that the implementation of PAYT programs reduced the amount of residual waste generated by 20% to 30%. In combination with other measures, especially the recycling of containers and packaging, PAYT programs can bring about a dramatic reduction in waste. 相似文献
99.
100.
Takashi Yamamoto Akiko Kida Yukio Noma Atsushi Terazono Shin-ichi Sakai 《Waste management (New York, N.Y.)》2014,34(2):536-541
Appropriate treatment of asbestos-containing wastes is a significant problem. In Japan, the inertization of asbestos-containing wastes based on new treatment processes approved by the Minister of the Environment is promoted. A highly sensitive method for testing asbestos fibers in inertized materials is required so that these processes can be approved. We developed a method in which fibers from milled treated materials are extracted in water by shaking, and are counted and identified by transmission electron microscopy. Evaluation of this method by using asbestos standards and simulated slag samples confirmed that the quantitation limits are a few million fibers per gram and a few μg/g in a sample of 50 mg per filter. We used this method to assay asbestos fibers in slag samples produced by high-temperature melting of asbestos-containing wastes. Fiber concentrations were below the quantitation limit in all samples, and total fiber concentrations were determined as 47–170 × 10?6 f/g. Because the evaluation of treated materials by TEM is difficult owing to the limited amount of sample observable, this testing method should be used in conjunction with bulk analytical methods for sure evaluation of treated materials. 相似文献