Journal of Environment and Safety
Online ISSN : 2186-3725
Print ISSN : 1884-4375
ISSN-L : 1884-4375
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Research Papers
  • Yukiko Iida, Takehiko Murayama, Shigeo Nishikizawa, Atsushi Nagaoka, M ...
    Type: Research Paper
    2019 Volume 10 Issue 3 Pages 165-175
    Published: 2019
    Released: November 12, 2019
    [Advance publication] Released: September 24, 2019
    JOURNALS FREE ACCESS

    The purpose of this research is to establish a method for measuring airborne asbestos concentration that can obtain an analysis value with the accuracy required for administrative guidance quickly at an analytical instrument owned by a local government.

    The time required to count a sample was measured using phase contrast microscopy and scanning electron microscopy. We compared about the eight types of measurement methods described in the asbestos monitoring manual from the results of verification experiments and literature surveys. The comparison items were the state of ownership of measuring machines in local governments, portability to dismantling sites, measuring conditions, analysis accuracy,purchase price of measuring machines, the analytical advantages and issues. As a result, it was judged that simplification of the phase contrast microscopy method with maintaining the analysis accuracy was most effective.

    We verified the time required for measurement, analysis accuracy (the lower limit of detection, the error range of the measured value) when the sampling time and the number of counting fields of view were changed in phase contrast microscopy.

    The asbestos monitoring manual describes conditions (sampling 30 minutes and the counting 100 fields of view) for when particularly quickness is required, and the calculated measurement time was 2.2 to 4.7 hours, the lower detection limit was 0.4 fiber / L, and the error range of measurement value was 1.6 fiber / L. As a result of comparing the measurement conditions, when the sampling time was 2 hours and the counting 50 fields of view, the measurement required time was 2.8 to 4.1 hours. And when the sampling time was 1 hour and the counting 100 fields of view, the measurement required time was 2.7 to 5.2 hours. Under both measurement conditions, the lower limit of detection was 0.2 fiber / L, and the error range of the measured value was 1 fiber / L.

    These two measurement conditions were almost the same in measurement time and higher in analysis accuracy,compared to the measurement conditions especially when rapidity was required. It is considered that these two measurement conditions can be used when promptness is required in on-site inspection at the time of asbestos-containing building demolition and renovation works.

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  • Koji Yamano, Reito Watanabe, Hotaka Kai, Masahiro Yamaguchi, Takuji Na ...
    Type: Research Paper
    2019 Volume 10 Issue 3 Pages 177-187
    Published: 2019
    Released: November 12, 2019
    [Advance publication] Released: October 07, 2019
    JOURNALS FREE ACCESS

    During the production of biodiesel fuel, wastewater containing about 10 to 20% of raw material oil such as glycerin,methanol, soap components and impurities such as unconverted fatty acids is generated. This wastewater can be treated by biological treatment such as activated sludge method, but there is no efficient treatment method. Therefore, in this study, we examined the optimum treatment conditions for the purpose of treating biodiesel fuel wastewater.

    The biodiesel fuel wastewater contains water soluble components and oil and, is emulsified. It was confirmed that the addition of an acid was effective for the decomposition of this emulsion (emulsion break). And that the oil component was separated by the decomposition of the emulsion, then the COD of the aqueous layer could be reduced. Also,substances that are the main cause of organic pollution of biodiesel fuel wastewater after emulsion break are glycerin and methanol. Furthermore, it was shown that in the hybrid condition in which activated sludge and MU11 strain were mixed,the rate of decrease of CODMn was fast compared to other conditions. Finally, Hybrid conditions have been shown to be effective for the treatment of biodiesel fuel wastewater.

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Topics & Reports
  • Tadashi Nishikimi, Rumiko Hayashi, Taiji Mishina, Kengo Tomita
    Type: Topics & Reports
    2019 Volume 10 Issue 3 Pages 189-196
    Published: 2019
    Released: November 12, 2019
    JOURNALS FREE ACCESS

    In order to ensure the safety of members in universities, it is critical to develop safety education programs systematically from a long-term perspective and make continuous improvements. From this point of view, we reported on the university-wide safety education initiatives conducted in Nagoya University in recent years. In particular, developing the internal guidelines for safety education as the “targets to be achieved” was very effective in making the various university members aware of the importance of safety education. Through providing various educational opportunities and content based on the guidelines, the safety awareness of members in the university has been gradually improved. We will continue to tackle issues for further improvement.

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  • Toshinori Matsui, Ayami Nishioka, Toshikazu Okazaki
    Type: Topics & Reports
    2019 Volume 10 Issue 3 Pages 197-204
    Published: 2019
    Released: November 12, 2019
    JOURNALS FREE ACCESS

    Safety education on liquid cryogen for Kagawa University Faculty of Engineering and Design consisted only of a single class that combines lecture and practice using presentation slides and printed materials that lead to understanding. However, investigation of the causes of liquid seal-related incidents that occurred in engineering departments strongly suggests that current safety education does not adequately prepare students to handle an actual crisis.

    This paper presents safety education programs in engineering departments focused on the mechanism of human memory to enable students to avoid adverse incidents by fully acknowledging the danger of the task of pumping liquid nitrogen. Firstly, we conducted a safety training that consisted of a lecture using interactive teaching materials and practical training utilizing video. Then, we carried out distributed learning to memorize these contents. Thereafter, through data via IC certification and work monitoring, issues were confirmed and then applied to create supplementary relearning materials for groups classified as having low education effect. Furthermore, a task-assistance web application was introduced that eliminates factors that hinder information communication based on operator attributes.

    This system drives educational content into long-term memory and is expected to be used in fields other than education on liquid nitrogen as a safety education model that encompasses a system that can retrieve this memory.

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