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Volume 31 (1995)
- Issue 3 Pages 137-
- Issue 2 Pages 63-
- Issue 1 Pages 1-
Volume 31, Issue 2
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1995 Volume 31 Issue 2 Pages 63-73
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (2692K) -
[in Japanese]1995 Volume 31 Issue 2 Pages 75-81
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (2682K) -
TSUGIO KOBASHI, TEIZOH HIGASHI, JINYA YAZAKI, OSAMI YAGI1995 Volume 31 Issue 2 Pages 83-87
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSGrowth characteristics of Scenedesmus abundans were studied under various nutrient concentrations. Cultivation were carried at 27°C in a 14h light/10h dark cycle with cool-white fluorescent lamps at 3, 000lx. The removals of nitrogen and phosphorus in the medium were determined. In the nitrate culture media, nitrite was found during the algal growth. One mg/l cell growth of S. abundans needs7.2μ g-at/l (0.101mg/l) of nitrogen, and 0.677μg-at/1 (0.021mg/l) of phosphorus.View full abstractDownload PDF (482K) -
TOSHIE HIZUKA, TOSHIHARU WATANABE1995 Volume 31 Issue 2 Pages 89-98
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSeasonal changes of the attached diatom assemblages and DAIpo (diatom assemblage index to organic water pollution) values were researched based on the comparison of the data in an unpolluted river (the Takami River) with those in a polluted one (the Saho River) in Nara Prefecture. Results were obtained as follows :
1. In the unpolluted site of the Takami River, DAIpo values were constant throughout all seasons. However, when the algal community exfoliated in cold season, we obtained the diatom assemblage with lower DAIpo value than natural unexfoliated community, even if the standing crop of it is large.
2. In the polluted site of the Saho River, DAIpo values were very lower in summer than in winter.View full abstractDownload PDF (952K) -
MYUNGSOOK JUNG, KAIKIN XU, YUHEI INAMORI, RYUICHI SUDO1995 Volume 31 Issue 2 Pages 99-104
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn order to clarify the effect of landfill leachate on water environment, algal assay procedure was conducted with several dilutions of a real leachate from a landfill site and the treated water of landfill leachate by the biological activated carbon fluidized bed process. Two kinds of freshwater algae, Selenastrum capricornutum and Microcystis aeruginosa, were used in this procedure. From the results obtained in this experimental study, it can be seen that the growth of S.capricornutum and M.aeruginosa was inhibited if undiluted solution of leachate was used; and if the EC50 was assumed as the dilution ratio of leachate, EC50 for the S. capricornutum and M.aeruginosa was 2.9% and 8.7%, respectively. In addition, the biological ac tivated carbon fluidized bed process was found to be an effective process to biodegrade the refractory organics and remove the hazardous materials in a landfill leachate.View full abstractDownload PDF (555K) -
GUOJI DING, KAIQIN XU, OSAMU NISHIMURA, YUHEI INAMORI, RYUICHI SUDO1995 Volume 31 Issue 2 Pages 105-115
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA survey of nematodes in drinking water treated by an advanced water treatment plant with biological treatment and granular activated carbon filter bed has been conducted for one year. Some nematodes with average 5.3%survival were observed in all samples from drinking water and the densities of nematodes seasonally fluctuated. Three genera 4 species were detected, but only two genera often appeared in which Plectus was abundant and Rhabditis was lesser. There was no relationship between rainfall and the densities of nematodes in drinking water. It was found that water temperature has a strong influence on the densities of nematodes. The species of nematodes in drinking water were much less than those in the water resource, which indicated that nematodes from the water resource were able to be removed by the water treatment facilities. On the other hand, the densities of nematodes in drinking water were much more than those in the water resource especially in the warmer seasons. It was suggested that some species like Plectus were able to breed within some treatment facilities, probably within the GAC filter.View full abstractDownload PDF (1165K) -
MASAHARU TADOKORO, TAKEHIKO OGAWA, TOSHIRO SAKURAI, SHIGERU OHNO1995 Volume 31 Issue 2 Pages 117-128
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSExperimental investigations using the model reactors of both separation and aeration in the small-scale onsite wastewater treatment plant (SOWTP) was carried out in order to evaluate its malfunction for domestic use caused by glucosuria. When wastewater containing glucosuria was anaerobically digested, acid fermentation occurred, causing accumulation of volatile fatty acids (VFAs) at high concentrations. When the BOD loading was high, the VFAs generated were primarily malodorous propionic acid, butyric acid, and valeric acid. Therefore, the decreases in pH and the occurrence of a bad odor in the sedimentation-separation chamber (the primary treatment chamber) of SOWTPs are considered to be due to acid fermentation of glucosuria. Furthermore, when the anaerobic digestion effluent (the primary effluent) was treated with activated sludge at a BOD-SS loading of 0.31 kg/kg·day or less, the BOD removal efficiency was 93%or higher if DO was maintained at a high level. Therefore, the lack of air supply in the aeration chamber (the secondary treatment chamber) is considered to be a major cause of deterioration of the final effluent, and that quality of the final effluent is considered to be improved by a marked increase in the air supply.View full abstractDownload PDF (1010K) -
KEISUKE IWAHORI, SHIGERU TATSUTA, KOICHIRO YAMAKAWA, MASANORI FUJITA1995 Volume 31 Issue 2 Pages 129-136
Published: June 15, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA simulation of the profiles of starch, its microbial metabolites, and dissolved oxygen in Aspergillus niger pellets formed by 5-day culture was carried out in order to assess the feasibility of starch wastewater treatment by fungal pellets. A higher oxygen permeability in the pellets was obtained with increasing pellet diameter, but glucose seemed to be accumulated inside the pellet under anaerobic conditions. However, effectiveness of the pellets was maintained at the high level when the bulk DO concentration was high. Since the substrate permeability of fungal pellets was superior to that of the bead immobilized by PVA-boric acid method, their highly effective treatment process of the starch wastewater was suggested to be feasible.View full abstractDownload PDF (719K)
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