Journal of Environmental Conservation Engineering
Online ISSN : 1882-8590
Print ISSN : 0388-9459
ISSN-L : 0388-9459
Volume 10 , Issue 12
Showing 1-11 articles out of 11 articles from the selected issue
  • [in Japanese]
    1981 Volume 10 Issue 12 Pages 935-943
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • 1981 Volume 10 Issue 12 Pages 944
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • —Economics and Energy Savings of System Alternatives—
    Masakatsu HIRAOKA, Nobuo TAKEDA, Kinichi OHSUMI, Kanemi OKU
    1981 Volume 10 Issue 12 Pages 945-954
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    The sewage sludge disposal systems involving anaerobic digestion process were investigated from points of economics and energy. Four optional systems with eight alternatives were analysed, setting the plant at three fixed scale, and the separate and combined sewer collection systems were chosen as the model. Profit of the additional investment to the conventional one and net profit were calculated and compared with each other. Net energy consumption, production and self-sufficiency of electricity were discussed. The optimal type of these systems depends on the scales and sewer systems of plants, and the digestion with heat treatment and dewatering without chemicals were the most effective systems.
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  • Tadao KASAKURA
    1981 Volume 10 Issue 12 Pages 955-963
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    The thermal processing has become one of indispensable processes of sewage sludge treatment in Japan. However, it is the most energy consuming process of sewage sludge treatment processes. Therefore, energy saving is now the most important subject in this field.
    As the equipment of sludge thermal processing, Multiple Hearth Furnace (M.H.F.) is mostly used in Japan. M.H.F. has hitherto been operated at high air ratio of 2.0-3.0. The main operating factor which influences energy consumption of M.H.F, is air ratio for combustibles. So, low air ratio operation is the most effective method for energy saving of M.H.F. Low air ratio operation is defined as the operation at lower air ratio of 1.2-1.5. Due to reduction of waste gas volume followed by reduction of sensible heat carried from M.H.F., auxiliary fuel for the furnace is reduced.
    A study on relationships between air ratio and furnace performance in M. H. F Was conducted. Material balance model of M.H.F.with some assumptions was chosen and the above relationships was simulated.
    This simulation verified how furnace performance is influenced by air ratio.
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  • Hiromu OHNO
    1981 Volume 10 Issue 12 Pages 964-966
    Published: December 30, 1981
    Released: March 18, 2010
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  • Iwao MATSNAGA, Tsutomu SHIMIZU
    1981 Volume 10 Issue 12 Pages 967-970
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
  • Masayoshi ISHIGURO
    1981 Volume 10 Issue 12 Pages 971-980
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • Itaru NAKAMOTO
    1981 Volume 10 Issue 12 Pages 981-985
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • Takao TSUCHIYA
    1981 Volume 10 Issue 12 Pages 986-994
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • Yoshimori KATO
    1981 Volume 10 Issue 12 Pages 995-1001
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
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  • Koichi FUJIE, Quo Jian Li, Hiroshi KUBOTA
    1981 Volume 10 Issue 12 Pages 1002-1008
    Published: December 30, 1981
    Released: March 18, 2010
    JOURNALS FREE ACCESS
    Practical operating conditions of the rotating biological contactor (RBC) wastewater treatment facilities were investigated by the questionary method.
    The results showed that the exaggerated design of the treatment facilities caused from the overestimated prediction of BOD load gives excess energy requirement in operation, while the BOD concentration in the effluent from RBC units are considerably lower than the design level. It was also noted that the electrical power consumption for the aeration in the reservoir tank is usualy greater than the power consumed by the rotating discs.
    In the design stage of the treatment facilities, the need of an exact estimation of BOD load is the most important. The modification of the reservoir tank system should be suggested for energy saving in RBC units.
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