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Volume 23, Issue 4
Displaying 1-6 of 6 articles from this issue
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ORIGINALS
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Masakazu FURUKI, Ikuyo KAMIMURA, Hajime MIYAZAKI, Masuyo MATSUMURA2000 Volume 23 Issue 4 Pages 213-219
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSAlgal assay procedure and algal growth potential test (AGP test) are adopted as the method to evaluate the state of eutrophication. Then, it is necessary to examine the precision of these procedures. The precision and reproducibility of these procedures that use the most general phytoplankton (Skeletonema costatum and Heterosigma akashiwo) in the coastal area of our country were checked. The determination of growth limiting nutrient of algae by multiple-nutrient tests was checked.
The results are following.
1) Coefficients of variation of the maximum standing crop were less than 10% at the repeat test.
2) The reproducibility of proliferation was not influenced by an addition of various nutrition on multiple-nutrient tests.
3) Age of the phytoplankton that was used as a source of inoculum did not exert an influence to the result of tests.
4) Proliferation of phytoplankton complied with Liebig's “Law of the Minimum” and the maximum standing crops were proportional to the amount of limiting nutrient available.
These results showed that it was possible to evaluate the progress of eutrophication and determine the growth limiting nutrient of algae with AGP test.View full abstractDownload PDF (846K) -
Hiroyasu ICHIKAWA, Takao YAMAGISHI, Shinji WADA, Kenji TATSUMI2000 Volume 23 Issue 4 Pages 220-225
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSTreatment of pulp bleaching spent liquor with peroxidase, laccase, tyrosinase, and three coagulants, chitosan, hexamethylenediamine-epichlorohydrin polycondensate (HE), aluminum sulfate (Alum), was conducted. Chlorophenols in bleaching spent liquor were effectively dephenolized with enzymes, but it was hard to reduce AOX and TOC. AOX and TOC were removed by adding the coagulants, but chlorophenols essentially remained in bleaching spent liquor. Treatment by an enzyme and a coagulant quite effectively removed not only chlorophenols but also AOX and TOC from bleaching spent liquor. Distribution of AOX and TOC on the relative molecular mass fraction of the breaching spent liquor was investigated. Most AOX constituted the mass fraction under 3000 of the chlorine breaching effluent.View full abstractDownload PDF (885K) -
Kohji MURAOKA, Teiji OHSHIMA, Yukitaka YAMAMOTO2000 Volume 23 Issue 4 Pages 226-231
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSThe urbanization of basin increases the impermeable area and decreases the infiltration of rainwater in the subsoil, and as the result the heavy rainfall is liable to cause the urban storm. This paper deals with a new residential area at the developed basin and discusses the characteristics of runoff discharge before or after development and with or without underground storage tank installed in the residential zone. The runoff analysis is used by the kinematic wave method and the peak cut of runoff discharge was ascertained to be effective by the underground storage tank. Long-term runoff analysis also brought a good result as to keeping the nine-month flow which means the condition that the discharge or the water level keeps the amount higher than one observed in nine months in a year. Anyway, the installation of underground tank at the residential area works preferably both for the flood control and for the improvement of the acquirement of water in the stream in the dry season.View full abstractDownload PDF (745K) -
Toshiya KOMATSU, Tsuyoshi DOHI, Kiyoshi MOMONOI2000 Volume 23 Issue 4 Pages 232-237
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSThe solvent tetrachloroethylene (PCE), a common soil contaminant, can be completely dechlorinated to ethylene and ethane by microorganisms under anaerobic conditions. Ethylene and ethane are harmless and environmentally acceptable products. This study was conducted to investigate factors influencing on an anaerobic bioremediation of PCE-contaminated soil.
An anaerobic enrichment culture, which is capable of dechlorinating PCE completely, sustained its transformation ability in the presence of soil, although the activity was lowered. Addition of the enrichment culture was indispensable for progressing complete dechlorination of PCE in actual contaminated soils. PCE contained in soil was first leached to liquid-phase and then dechlorinated. Therefore, desorbing rate of PCE from soil was an important factor in the bioremediation. PCE was also dechlorinated to ethylene and ethane under the condition of low liquid/solid (L/S) ratio of 0.2l · kg-1 by adding the enrichment culture.View full abstractDownload PDF (685K)
TECHNICAL REPORT
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Haruo ANDO, Masao YAMAZAKI2000 Volume 23 Issue 4 Pages 238-242
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSA new type of simple water sampler which can be used to simultaneous multi-depth observation in the coastal sea area was developed. Using this sampler, about 100ml sea water samples were obtained at about 1 m interval of depth in Tokyo Bay and their nutrient concentrations were measured. Less than 15 minutes was needed to get 23 multi-depth samples with this sampler. The observed vertical distribution patterns of nutrients indicate that the simultaneous samplings at multiple depths were successfully carried out and detailes vertical observations of this kind are required to estimate accurately total amounts of nutrients in this sea area.View full abstractDownload PDF (753K)
NOTE
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Shigemi FURUSAWA, Satoshi NAKAI, Masaaki HOSOMI2000 Volume 23 Issue 4 Pages 243-245
Published: 2000
Released on J-STAGE: December 01, 2006
JOURNAL FREE ACCESSStrain TM-2 capable of growing on 4-nonylphenol (4-NP) as a sole carbon source was isolated from river water collected from Tama River.
Cultivation of strain TM-2 in a culture medium containing 4-n-nonylphenol (4-n-NP) at a concentration of 5 mg · l-1 showed that strain TM-2 could degrade 60% of 4-n-NP during the first 10 days of cultivation.
It should be noted that degradation of 4-n-NP by strain TM-2 produced an unknown compound, which was confirmed by analyzing the culture medium of strain TM-2 using a reversed phase high performance liquid chromatography equipped with an electrochemical detector (RP-HPLC-ECD). Based on the result that this electrochemically detectable compound was eluted faster than 4-n-NP on the RP - HPLC - ECD, it was suggested that a more polar phenolic compound than 4-n-NP was produced by degradation of 4-n-NP by strain TM-2.View full abstractDownload PDF (352K)
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