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Volume 23, Issue 1
Displaying 1-5 of 5 articles from this issue
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ORIGINALS
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Jun SUZUKI, Masaaki MATSUBARA, Yoshihisa KITAOKA, Takashi KATO, Kazuhi ...2000 Volume 23 Issue 1 Pages 29-33
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSApproximately 1,000 white rot fungi strains were screened by the ability of degradation of polycyclic aromatic hydrocarbons (PAHs) such as anthracene, pyrene, fluoranthene, benzo [a] pyrene, and dibenzo [a, i] pyrene. Thirty three strains of them had considerably higher degrading ability than the typical white rot fungi, Phanerochaete chrysosporium and Trametes versicolor. Among these strains, two strains showed superior degrading ability and low-specificity in degrading various PAHs. They could degrade PAHs efficiently under nutrient-limited conditions in both liquid phase (low-nitrogen medium) and solid phase (nutrient-poor soil). But those degrading ability was suppressed under nutrient-rich conditions. The purified ligninolytic enzymes such as lignin peroxidase, manganese peroxidase, and laccase could degrade PAHs.View full abstractDownload PDF (616K) -
Akihiro NAGANO, Chihiro NAKAMOTO, Masaharu SUZUKI2000 Volume 23 Issue 1 Pages 34-40
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSElectrolyte is one of important factors in the electrolysis for decolorization. NaCl was more effective than NaHCO3 or Na2SO4. The decolorization characteristics of melanoidine, caramel and polyphenolic compounds were studied. The decolorization efficiency (DE) of a caramel solution with NaCl was 1,000 to 2,000U · l · kC-1 although that of a caramel solution decolorized with NaHCO3 was 30. DE of molasses wastewater from alcohol distillery was the same order as caramel and was different from DE of melanoidine or polyphenolic compounds. The decolorization reaction was mainly occurred on the anode in the experiment separated using a salt bridge. And the effectiveness of NaCl addition was caused by a preferential oxidation against colored compounds and a high efficiency on the oxidation of organic compounds.View full abstractDownload PDF (891K)
NOTE
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Toshihiro NAKAI, Yoshio SATO, Nobuyuki TAKAHASHI, Yoshishige KATO, Isa ...2000 Volume 23 Issue 1 Pages 41-45
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSWhen a chlorinated ethylene solvent such as trichloroethylene (TCE) or tetrachloroethylene (PCE) in aqueous solution is adsorbed on activated carbon and then extracted with supercritical carbon dioxide, unlike steam desorption, the recovered solvent may not contain hydrolyzates or water which lead to problems during recycling. However a solvent with high volatility becomes a problem regarding recovery at low pressure of supercritical carbon dioxide. The recovery of solvent by decompressing and cooling was thus studied. Optimal conditions for extraction were 100kg · cm-2 pressure at 35°C, and for recovery, 10kg · cm-2 pressure at -30°C. In the case of TCE, slight dispersion was observed, but carbon dioxide with little dispersed TCE could be compressed and reused for extraction of TCE from activated carbon. For PCE, there was little dispersion. Solvent recovered from activated carbon in aqueous solution contained water. On decompressing the supercritical fluid being passed through a zeolite layer immediately after extraction, solvent having the same IR spectrum as the original solvent spectrum was recovered.View full abstractDownload PDF (545K)
REPORT
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Jun NAOHARA, Toyoaki KAWANO, Kazumasa FUJIWARA2000 Volume 23 Issue 1 Pages 46-54
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSEleven elemental concentrations (Na, Cr, Mn, Fe, Cu, Zn, As, Se, Cd, Hg, Pb) of water of three river systems (the Yoshii River, the Asahi River and the Takahashi River) in Okayama Prefecture were determined by inductively coupled plasma mass spectrometry (ICP-MS). A difference of each element concentration by river system was identified. In the Yoshii River, the elements (Mn, Fe, Cu, Zn and Cd) were significantly higher than those in other rivers (the Asahi and the Takahashi River). In the Asahi River or the Takahashi River, no element was significantly higher than the other rivers. Different characteristics of elements among the three river systems were recognized. The elements increase according to increase in flow rate. Especially, the coefficient of correlation on relationship between distance from mouth of river and elements (Cr, Cu and As) concentration in river was high. Elemental concentrations of every determined site were not over the water quality criteria concentration of tap water.View full abstractDownload PDF (1058K)
TECHNICAL REPORT
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Morio SUMIMOTO, Tadanori AZUMA, Isao KIMURA2000 Volume 23 Issue 1 Pages 55-58
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSIn the conventional system of engine lubrication, luburicating oil is renewed with fresh oil after it is used for some period. Accordingly, waste oil is generated in the conventional system. The authors have developed a new technology which makes it possible to use lubricating oil semi-permanently without oil renewal and, therefore, without any waste oil. This technology has been working well in about one thousand marine and cogeneration diesel engines in practical use for many years. The new technology always keeps lubricating oil clean as the kidney of animals always keeps their blood clean. This is why lubricating oil can be used semi-permanently and the new technology is called kidney system. The techology can be used to clean and recycle many kinds of liguids. This paper reports about recycling the lubricating oil mixed in waste water from compressors in a fertilizer company.View full abstractDownload PDF (496K)
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