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Volume 35, Issue 12
Displaying 1-3 of 3 articles from this issue
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Original Paper
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Hiroki MASUMOTO, Futoshi KURISU, Ikuro KASUGA, Hiroaki FURUMAIArticle type: Original Paper
2012 Volume 35 Issue 12 Pages 197-204
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSIn this study, we investigated the effects of organic acid addition and cultivation temperature on anaerobic methanogenic benzene-degrading enrichment culture which include Syntrophobacterales bacterium Hasda-A, a putative benzene degrader, and its relatives. Benzoate, crotonate, fumarate and acetate, added respectively with benzene, retarded benzene degradation in all cases. However, it was implied that the addition of these organic acids may maintain the number of cells of Hasda-A and its relatives. Cultivation temperature was varied at 3°C intervals ranging from 25°C, at which we have succeeded in obtaining an anaerobic benzene degrading culture, to 37°C, the optimum cultivation temperature for mesophilic methanogens. It was shown that cultivation at 31°C or below can maintain benzene degradation rates higher than that at 34°C and above. In all the experiments, the number of 16S rRNA gene copy of Hasda-A and its relatives correlated with benzene degradation.View full abstractDownload PDF (1210K)
Technical Report
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Atsushi KITANAKA, Seiko KANTANI, Yohito ITOArticle type: Technical Report
2012 Volume 35 Issue 12 Pages 205-210
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSThe membrane bioreactor (hence forth MBR) has recently been applied to wastewater treatment in various industries such as the fiber, food processing, and the oil refining industries in addition to general sewage treatment. We examined MBR performance using raw water including various types of oil in laboratory tests. The results showed a stable MBR operation when raw water with biodegradable oil was treated with appropriate biological loading. They also showed that activated sludge under higher biological loading and nonbiodegraded residual oil may cause membrane fouling. When treating raw water including nonbiodegradable oil, MBR performance differs depending on the kinetic viscosity of oil. It was found that high-kinetic-viscosity oil causes fouling with in a short period and that oil in the supernatant of activated sludge may affect MBR operation performance.View full abstractDownload PDF (1189K)
Survey Report
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Satoshi SASAKURA, Kazufumi KAWASAKI, Kenji OKUYAMA, Yasuhiko SAKAI, Su ...Article type: Survey Report
2012 Volume 35 Issue 12 Pages 211-216
Published: 2012
Released on J-STAGE: December 10, 2012
JOURNAL FREE ACCESSA simultaneous water quality survey in Osaka Bay has been conducted in cooperation with private sectors, universities and governments every summer since 2004. The survey is characterized by almost the same sampling date and sampling depth and by widespread sampling from the shore to the bay mouth. In this report, we describe an overview of the survey and investigate the relationships between climate conditions and the distributions of bottom dissolved oxygen (DO) and surface chemical oxygen demand (COD) as well as the distributions of nitrogen and phosphorus from the shore to the bay mouth. Bottom DO and surface COD, which are indexes of water quality targets in the Action Plan to Revive Osaka Bay, do not reach their target values in the inner bay. These distributions vary according to climate conditions. The dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) concentrations at the upper layer, which are 0.34 mg·L-1 and 0.032 mg·L-1 in the inner bay, decrease to 0.03 mg·L-1 and 0.008 mg·L-1 in the bay mouth, respectively.View full abstractDownload PDF (2233K)
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