Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
Volume 8 , Issue 11
Showing 1-13 articles out of 13 articles from the selected issue
  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1043-1044
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • 1979 Volume 8 Issue 11 Pages 1045-1046
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • —Selection of NH4Br-Cu (II) -NaY Zeolite Catalyst and Reaction Mechanism—
    Shigeaki Kasaoka, Eiji Sasaoka
    1979 Volume 8 Issue 11 Pages 1047-1058
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    For the purpose to develop high active catalysts for low temperature reduction of NO with NH3, the effect of addition of halogenides (NH4Br, NH4I, NH4Cl, HBr) to Cu (II) -exchanged Y-type zeolite, V2Ox-activated carbon and V2Ox-TiO2 catalysts, etc. and the reduction mechanism were studied by the temperature programmed reaction and desorption methods.
    The experiments on the reduction of NO were carried out by using a flow re'actor (I.D.: 12.0 mm) under atmospheric pressure and at 90-220°C. The average diameter of the granular catalysts was 1.0 mm. Inlet gas concentration was mainly 470 ppmNO-30 ppmNO2-667 ppmNH3-5%O2-0 or 10%H2O-N2 and the total gas flow rate was 1000 Ncm3/min (space velocity: 4.0×104hr-1) toward 1.5 ml (bulk volume) of the catalysts.
    These results showed that NH4Br-Cu (II) -NaY was found to be highly active and stable catalyst. Furthermore, the reduction mechanism over Cu (II) -NaY and NH4Br-Cu (II) -NaY, the contribution of surface oxygen (= adsorbed oxygen+lattice oxygen) and adsorbed NH3 to the promotion of reaction rate was clarified.
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  • —Aerobic Denitribication—
    Munetaka Ishikawa, Hiroshi Nakanishi
    1979 Volume 8 Issue 11 Pages 1059-1068
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    In this paper we deal with the denitrification in aerobic treatment system. We called this phenomena “Aerobic denitrification” Recently, basic research on this aerobic denitrification is seldom found, although its practical applications have been rather extensively studied. Hence, we have conducted experimental research in order to obtain basic data to establish a clear phenomena of aerobic denitrification. As the results, basic research on the aerobic denitrification of night soil was conducted to investigate the optimal condion of the denitrification and the removal rate of nitrogen. The experimental results showed that about 80% of nitrigen were removed by aerobic denitrification even in the laboratory conditions.
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  • —Treatment of exhaust gas emitted from printing house—
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1979 Volume 8 Issue 11 Pages 1069-1079
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    Organic solvents included in exhaust gas emitted from printing house were absorbed on the active carbon at the rate of 4m3/min, and the following results were obtained.
    (1) The concentrations of the total hydrocarbons (calculated in CH4) were 200-2600 ppm at the inlet of absorption apparatus, and decreased in 20±5 ppm at the outlet. These data showed that the concentration of hydrocarbons at the outlet were independent on those at the inlet. Even, in the brake point, more than, 90% of hydrocarbons were removed.
    (2) The odorous substances were also removed satisfactory.
    (3) Solvents having high boiling point and high molecular weight could be absorbed on the active carbon effectively, on the other hand, solvents having low boiling point and high polarity such as ethyl acetate, MEK and aceton could not be absorbed effectively. The absorbed solvents such as MEK and aceton were replaced with the other solvents at the brake point, and detected in the outlet.
    Desorption of the absorbed solvents on active carbon was done by steam heating at 105° for 60 min. The effective re-absorption rate of total solvents was about 9% and the remaining was 12% of active carbon weight.
    (4) The plant proved to be safe for fire during the absorption process of dilute solvent and desorption process of the solvent by steam.
    To prevent the temperature rise in active carbon due to the oxidation of solvents during stopping, the plant must be stopped after desorption process.
    To prepare the case of temperature rise, the automatic showering apparatus which spray water to the active carbon at 70-80°C must be installed.
    Based on the data obtained from the experiments a practical plant 320 Nm3/min was built, which showed satisfactory performance as expected. The condensed water are distillated and the solvents are recovered.
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1080-1081
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1082-1086
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1087-1092
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1093-1102
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1103-1113
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1114-1119
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • Yosry A. Attia, Jorge Rubio, [in Japanese]
    1979 Volume 8 Issue 11 Pages 1120-1121
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1979 Volume 8 Issue 11 Pages 1122-1125
    Published: November 30, 1979
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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