| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2010: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2009: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2008: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Research Abstract |
We determined concentrations of Cryptosporidium oocysts and Giardia cysts in raw sewage and treated sewage effluent to calculate removal rates in swine sewage treatment plants. Removal rates calculated from the above average values were 2.14 log for Cryptosporidium oocysts and 2.42 log for Giardia cysts. It was clear that both protozoa could be effectively removed by sewage treatment.
Three years studies were carried out in the concentration of hepatitis E virus (HEV) in shellfish. The concentration of each virus was determined using real-time quantitative PCR after concentration of the water samples using negatively-charged membranes. HEV were detected in shellfish at the mouth of a river.
C.parvum oocysts and B.subtilis were evaluated for infectivity with infectivity assay after treatment by ultraviolet irradiation alone, contact with oxidizing agent alone, and contact with oxidizing agent after UV irradiation. The log reduction with combined treatment of oxidizing agent after UV irradiation was 1.7-100 times greater than the sum of the log reductions by these separate treatments under the same conditions. The results indicate that the combination of oxidizing agent after UV irradiation has a synergistic effect on microorganism inactivation.
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