Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 33, Issue 5
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_1994_5
Displaying 1-11 of 11 articles from this issue
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PROPOSAL FOR SAFETY
REVIEW
  • Airborne Asbestos in Morioka City
    Naohiro Otsuka, Yoshinori Sekimoto, Yutaka Oikawa
    1994 Volume 33 Issue 5 Pages 282-288
    Published: October 15, 1994
    Released on J-STAGE: June 30, 2017
    DOIhttps://doi.org/10.18943/safety.33.5_282
    JOURNAL FREE ACCESS
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    The concentrations of airborne asbestos in Morioka city were measured with phase contract microscopy. The concentrations of asbestos and fibrous material showed a seasonal variance highly near roadway during the late 1980's. Namely, they increased in proportion to the concentrations of suspended particulate in winter. And the concentrations of fibrous material were about 10 times as large as those of aebestos fibers The source of these fibers might be caused from aggregates of paving materials that were wore out by vehicles equipped with studded tires. Fibrous materials were investigated with transmi~sion electron microscopy equipped with EDX It became clear that they were actinolite that is a kind of asbestos minerals. It is assumed that all fibrous materials were actinolite, and so the concentrations of asbestos might exceed 10f/1, that was considered the environmental standard, at many points near roadway during the late 1980's The concentrations of asbestos didn't show to increase after the law prohibited from using studded tires.

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  • Characteristic Eva.luation and Treatment of Wastewater Containing Noncombustible Working Oil
    Hong-Ying Hu, Koichi Fujie, Kohei Urano, Kojiro Murayama
    1994 Volume 33 Issue 5 Pages 289-295
    Published: October 15, 1994
    Released on J-STAGE: June 30, 2017
    DOIhttps://doi.org/10.18943/safety.33.5_289
    JOURNAL FREE ACCESS
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    Characteristics of wastewater containing noncombustible working oil was investigated in terms of coagulation, ozonation, oxidation using Fenton's reagent (Fentc]n oxidation, hereafter) and biodegradability to propose the optimal treatment process. Beside the BODs tests the continuous biological treatment using a laboratory scale submerged biofilter was successfully introduced to evaluate the biological treatability. It was ascertained that the Fenton oxidation of the effluent of biological treatment is effective to make the residues biodegradable with less consumption of the reagents. Gelchromatogram with the analysis of dissolved organic carbon was successiully used to identify the poor degradable pollutants in the wa8tewater. Fenton oxidation fcllowed by the secondary biological treatment was proposed to remove the residual pollutants in the primary biological treatment of the wastewater.

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TECHNICAL NOTE
TECHNICAL REPORT
SALOON
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