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Predecessor
Volume 36, Issue 1
Displaying 1-3 of 3 articles from this issue
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Original Paper
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Ryo SHOJI, Naohisa OKITA, Hiroki NAKANISHIArticle type: Original Paper
2013 Volume 36 Issue 1 Pages 1-9
Published: 2013
Released on J-STAGE: January 10, 2013
JOURNAL FREE ACCESSIn this study, the effects of humic acid on algal growth inhibition by copper were quantitatively investigated. First, the binding of proton and cupric ions to three types of binding site in humic acid were analyzed using the NICA (non-ideal competitive adsorption)-Donnan Model. The model developed was used to predict the binding of cupric ions to humic acid at various pHs. Then, the effects of humic acid on the inhibition of Pseudokirchneriella subcapitata growth by copper were examined. In terms of effects of humic acid on such growth inhibition of P. subcapitata, humic acid in the Tama river sediment was different from commercial humic acid. In conclusion, humic acid in the Tama river sediment has a similar property to fulvic acid. Particularly, the contribution of copper binding the phenolic site in humic acid to algal growth inhibition caused by copper toxicity is large compared with that of the copper binding the three binding sites, i.e. the phenolic and carboxylic sites and the Donnan phase in humic acid.View full abstractDownload PDF (1474K)
Original Paper
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Iwato AMANO, Kiyo KURISU, Jun NAKATANI, Keisuke HANAKIArticle type: Original Paper
2013 Volume 36 Issue 1 Pages 11-22
Published: 2013
Released on J-STAGE: January 10, 2013
JOURNAL FREE ACCESSThe effect of information provision on the risk perception of drinking water was investigated on the basis of information contents and the respondent's personality and socio-demographics. The respondents were divided into 11 groups and the combination of provided information was varied for each group. The effectiveness of information provision was observed as a decrease in the "unknown" score, while the "dread" score was increased in all the groups with information provision. Numerical information like the number of group infections and DALY itself showed no marked effect on risk perception; however, the recognition of the number of group infections showed an effect on risk perception. Larger risk perceptions and a larger effect of information provision were observed in the respondents who have personality traits like "recklessness" and willingness to actively accept risks.View full abstractDownload PDF (1834K)
Survey Report
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Ikuo TSUSHIMA, Masashi OGOSHI, Hiromasa YAMASHITA, Ichiro HARADAArticle type: Survey Report
2013 Volume 36 Issue 1 Pages 23-28
Published: 2013
Released on J-STAGE: January 10, 2013
JOURNAL FREE ACCESSThe radioactive fallout emitted by the Fukushima Dai-ichi nuclear power plant has flowed into and accumulated in many wastewater treatment plants (WWTPs) of eastern Japan via sewer systems. The behavior of radioactive materials in four WWTPs in the Tohoku and Kanto regions was investigated to determine the mechanism by which sludge is concentrated during water and sludge treatment processes. In addition, dissolution tests were conducted using contaminated incinerated ash and melted slag derived from sewage sludge to better understand the landfill disposal of contaminated sewage sludge. Results indicate that a large amount of radioactive cesium accumulates in aeration tanks with activated sludge and becomes trapped in concentrated sludge during sludge condensation. Results indicate that the radioactivity of the eluate from 9 out of 12 samples was undetectable; for the remaining 3 samples, the dissolution rates were 0.5-2.7%.View full abstractDownload PDF (1191K)
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