Journal of the Society of Agricultural Structures, Japan
Online ISSN : 2186-0122
Print ISSN : 0388-8517
ISSN-L : 0388-8517
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Volume 29, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Studies on the Inactivation of Water Bloom Particles (Part II)
    Effects of Mixing and Ultrasonic Wave on the Efficiency of Ozone and UV-C Treatments
    Keo INTABON, Takaaki MAEKAWA
    1998 Volume 29 Issue 2 Pages 51-56
    Published: September 25, 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.51
    JOURNAL FREE ACCESS
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    Effects of mechanical mixing and ultrasonic wave applied on freshwater samples containing water bloom particles previous to their submission to ozone and UV-C were investigated. Both mechanical treatments effectively reduced chl. a contents and photosynthetic ability and increased transparency of the water samples treated with UV-C. However, mixing treatment was the most powerful. Inactivation effect by ozone was not fairly obtained even with mechanical treatments. However, under the conditions of UV-C treatment in these experiments, complete inactivation effect was not possible on water samples containing algal chl. a higher than 140μg/L.
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  • Effect of Plastic Media on Mesophilic Methane Fermentation of Separated Dairy Manure Slurry at high solids concentration
    Kazutaka UMETSU, YU Neu, Hideo HOSHIBA, Hidehiko TAKAHATA
    1998 Volume 29 Issue 2 Pages 57-67
    Published: September 25, 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.57
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    The purpuse of this study was to investigate the performance of two types of plastic media for fixed-bed anaerobic reactor of dairy manure slurry at high solids concentration. Two media types were polyurethane and polyester. The effects of loading rate (3.15-10.09g/L·day) on the methane production, methane concentration and the composition of effluent were observed. The results were summarized as follows:
    1. With increasing the loading rate, the CH4 production and the CH4 concentration in the fixed-bed reactors were more stable than the conventional reactor.
    2. A high rate of media volume kept methane production more stable than a low rate.
    3. Evaluation of the two madia types showed that polyester was slight more effective in retaining the bacterial culture, and the original media were not lost during the experiment.
    4. From the above findings, it can be concluded that a fixed-bed reactor retaining the methane bacteria in high concentration demonstrates the characteristics that make it suitable to apply to the high loading rate with high solids of dairy manure slurry.
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  • Liquefaction for Anaerobic Treatment of Soybean Meal
    Yutaka KITAMURA, Akio TAGAWA, Seiji NAKAO, C. L. HANSEN
    1998 Volume 29 Issue 2 Pages 69-74
    Published: September 25, 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.69
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    The liquefaction process for the first stage of anaerobic methane fermentation process was used as a way to utilize soybean meal (Okara) which is a byproduct of soybean processing. Four continuously stirred tank reactors (CSTR) for liquefaction were continuously fed Okara slurry. After they reached steady state, data was obtained to determine the process applicability and kinetic parameters for the process simulation. The liquefaction ratio of Okara solid as 67% to 83% and high product concentrations as 6.16 to 10.32g-VA/L in the CSTR's indicated that the process was applicable to utilize Okara for its biogasification. According to the material balance and kinetic models for the CSTR, relationships between the operational condition and the reactor characteristics were established. A maximum microorganism density about 18g-VSS/L and product concentration about 10g-VA/L were produced in the CSTR's with the shorter critical HRT about 10 days with the loading rate 33g-Okara/L-d.
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  • Development of a Hydroponics system and its Thermal Performance
    Kazuhiko ABE, Nobuyuki TAKAHASHI
    1998 Volume 29 Issue 2 Pages 75-80
    Published: September 25, 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.75
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    A new hydroponics system made up of a box and a tube sprinkler was tested. A box 0.6m in width, 0.8m in height, and 6m in length was slightly insulated, except for the bottom area, which only had PEfilm laid on it. The sprinkler, set in the middle of the box, sprays over plant roots suspended at the top plate of the box, and also regulates the inside temperature.
    About 10 kinds of vegetables including their roots grew very well, and their nutritive values (vitamins, minerals, etc) were higher than that of Japan Foods Standard Components.
    The thermal performance between box and soil was as expected. The result of thermal analysis showed the water volume in the bottom in the box is suitable when it is 50-100mm in depth.
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  • Erratum to : Studies on Effective Radiation Area and Radiation Configuration Factors of a Pig (Part 2)
    1998 Volume 29 Issue 2 Pages 90a
    Published: 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.2_90a
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  • Erratum to : Examples and Characteristics of wind damages on plastic greenhouses
    1998 Volume 29 Issue 2 Pages 90b
    Published: 1998
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.29.2_90b
    JOURNAL FREE ACCESS
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