Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
Volume 39, Issue 8
Displaying 1-8 of 8 articles from this issue
  • Tsuyoshi YOSHIOKA, Hideyuki HOSONO, Michinobu FURUKAWA, Ryuji MATSUHAS ...
    2010 Volume 39 Issue 8 Pages 450-457
    Published: August 20, 2010
    Released on J-STAGE: October 11, 2011
    JOURNAL FREE ACCESS
    The commercial sector's greenhouse gas emissions are increasing, and gas cogeneration is a practical solution that can be applied to combat global warming. Energy service providers have wide market coverage in Western countries, but only appeared in Japan in the early 2000's as a new business, due to deregulation in the power market. The energy service providers install energy supply equipment (at their own cost) and supply the necessary energy to their clients, all the while managing the many project risks directly linked to the profits. In this paper, we analyze financial risk and detail measures that can be taken to manage the energy service projects, using case studies of a commercial building, a city hotel and a hospital.
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  • Hiroshi HIROTANI
    2010 Volume 39 Issue 8 Pages 458-463
    Published: August 20, 2010
    Released on J-STAGE: October 11, 2011
    JOURNAL FREE ACCESS
    An exotic freshwater clam, the Asian clam (Corbicula fluminea) , native to Southeast Asia, has been expanding its habitat in Japan in recent years. Clams are filter-feeders that are known to ingest bacteria and viruses as well as phytoplankton, which will either be digested or accumulated in their bodies. The potential for the Asian clams to remove Escherichia coli, a microbial indicator of fecal contamination, and bacteriophage MS2, a model of pathogenic viruses causing waterborne infections, was investigated in the following study. The clams collected from the Yamato River removed E. coli in water and in interstitial water between sands, but they were not able to remove MS2. The difference in size of the bacterial cells and bacteriophage particles was deduced to be responsible for the difference in removal. It is suggested that it is possible to decrease indicator counts of E. coli using freshwater clams, even though viruses can still remain in the environment.
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  • Koji TOSA, Hideyuki HONDA, Mika ISONO
    2010 Volume 39 Issue 8 Pages 464-470
    Published: August 20, 2010
    Released on J-STAGE: October 11, 2011
    JOURNAL FREE ACCESS
    Water tank building materials including wood from Chamaecyparis nootkatenisis and Cryptomeria japonica, fiber reinforced plastics and stainless steel (SUS316) were measured for water quality using laboratory scale water tanks. For the fiber reinforced plastic (FRP) and stainless steel tank, all tested water quality parameters (pH, suspended solids, color, nitrites, nitrates, residual chlorine, trihalomethanes, coliforms, Escherichia coli, standard plate count and heterotrophic bacteria) satisfied drinking water quality criteria in Japan. The chlorine reduction rate in the wood tanks correlated with the surface area of the tank, that is, water interface divided by the stored water volume. Half-life of residual chlorine in the full scale wood tank is calculated at approximately 4 days, based on the results of the chlorine reduction rate in the laboratory scale wood tanks. The results indicate that water from the full scale wood tank may satisfy drinking water quality criteria in Japan.
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