| Budget Amount *help |
¥33,150,000 (Direct Cost: ¥25,500,000、Indirect Cost: ¥7,650,000)
Fiscal Year 2017: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2015: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000)
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| Outline of Final Research Achievements |
To reduce the amount of excess sludge from a wastewater treatment facility, a high-pressure jet device (HPJD) was developed. Bacterial cell disruption mechanisms by an HPJD were investigated. The application of an atomic force microscopy to a single bacterial cell elucidated that cavitation is most intense factor to disrupt bacterial cells among friction, collision and itself. The installation of an HPJD into a modified Ludzak-Ettinger process reduced the amount of excess sludge discharge by, at maximum, 73% in comparison with the process without an HPJD. Deterioration of water qualities of the treated water and settlability of activated sludge due to an HPJD was not observed. The analysis of amplicon sequencing based on 16S rRNA gene displayed the reduction of filamentous bacteria in the process with an HPJD, suggesting an effectiveness in prevention of sludge bulking.
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