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Online ISSN : 1349-9262
Print ISSN : 1348-6012
Volume 54 , Issue 4
Showing 1-3 articles out of 3 articles from the selected issue
Original Papers
  • Shigeya NAKAMURA, Katsuhisa TOKUMITSU, Mitsunobu KITAMURA, Eiichi MIYA ...
    2007 Volume 54 Issue 4 Pages 167-174
    Published: 2007
    Released: November 21, 2007
    JOURNALS FREE ACCESS
    In order to improve the mechanical properties of recycle PE and PP blending material (hereafter, r-PE/PP), the method for adding several kinds of compatibilizers into r-PE/PP was investigated. The content of PE in the r-PE/PP was characterized by the FT-IR measurement using a master curve consisted of specific absorption ratios (APE/APP) with a series of PE content in PE/PP blends, resulting that PE/PP ratio was 49/51 (wt/wt%) in r-PE/PP.
    The neat r-PE/PP showed brittle property, and the elongation at break was 67.5%. When adding some kinds of compatibilizers into the r-PE/PP, the property became ductile and the elongation at break was over 800%. In particular, the compatibilizers having chemical structure SEBE and EEBE enabled the r-PE/PP to improve the impact strength more than 6 times in comparison with that of the neat r-PE/PP. This result indicated that the compatibilizer should have chemical structure containing rubber-like segments. Furthermore, the variation of mechanical property of the r-PE/PP blended SEBE or EEBE with adding amount of them was investigated, and it can be found that for adding 0.5wt% EEBE the elongation at break was still over 1000% and the impact strength was also more than that of the neat r-PE/PP, suggesting that the chemical structure of EEBE was one of the most promising candidates for improving the mechanical properties of the r-PE/PP materials.
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  • Atsushi SHIBAYAMA, Atsushi SOUMA, Yuichi SUGAI, Hajime MUTO
    2007 Volume 54 Issue 4 Pages 175-181
    Published: 2007
    Released: November 21, 2007
    JOURNALS FREE ACCESS
    In recent years, the hazardous nature of the environmental hormones (endocrine disturbing chemicals) has been regarded as an environmental serious issue. About 70 chemical matters were known as incredulous kind of environmental hormone by Japanese investigation. It often reminds that some kind of environmental hormone may have possibility of eluting to natural river and sea from disposal/landfill site or sewage treatment plant.
    In this study, the effective removal of hormone (Bis-phenol A (BPA) and 17β-Estradiol (E2)) was investigated by using amorphous iron hydroxide compound and activated carbon for water treatment. From experimental results it is clear that the pH (of the medium) has a great effect for iron hydroxide compound to adsorb the BPA and E2. In the case of BPA, the adsorption and desorption were alternatively conducted under controlled of pH 9 to pH 11. From pH 3 to pH 9, the adsorption of E2 by iron hydroxide is more effective than that at pH 11. Additionally, it is effective to remove E2 by activated carbon even at lower concentration of E2.
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  • Hiroshi NAKAZAWA, Wataru HAREYAMA
    2007 Volume 54 Issue 4 Pages 182-186
    Published: 2007
    Released: November 21, 2007
    JOURNALS FREE ACCESS
    Arsenic occurs mostly as arsenite (As (III)) or arsenate (As (V)) in natural water. As(III) is more difficult to be remove than As(V), and it is necessary to oxidize As(III) to As(V) for effective removal. Arsenite-oxidizing population, named IWAS, was selected from acid mine drainage. IWAS oxidized arsenite to arsenate in the pH range from 2.1 to 1.2. IWAS can gain the energy for the growth through oxidation of As(III) to As(V). In this study, we examined the effects of factors such as organic matter, As(III) concentration and so forth on microbial oxidation of arsenite.
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