| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Concentration methods for the genotoxicity test of effluents from johkasous were decided and the genotoxicity of domestic wastewater in several model areas were investigated by using the methods. As a result, the order of intension of the genotoxicity was as follows; Gappei-johkasou > Tandoku-johkasou ≒ Community plant ≫ Vault toilet. The genotoxicity varied more than 10 times depending on the treatment methods and sampling sites. Moreover, it was revealed for the first time that the values of the genotoxicity in the present study were several ten to hundred times higher than that of Japanese typical tap water. In addition, reduction of the genotoxicity using several reagents was attempted. However the results were different from expectations. As for reactions with chlorine, it was shown that the genotoxicity became stronger if free chlorine was added further after ammonia nitrogen had almost disappeared by a reaction with free chlorine.
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