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Application Example of a Volume Reduction System for Dredged Sludge by Screw Decanter Centrifuge
In order to transport high-moisture sludge dredged in the sea area to a waste disposal site, it is essential to reduce the moisture content ratio of dredged sludge. Therefore, we devised a volume reduction system for high-moisture sludge and applied it at Dokai Bay located in Kitakyushu City. The volume reduction system consisted of a two-step process, a dewatering process and a cement reforming process. The moisture content ratio (wn) of the dredged sludge was more than 200%, and the moisture content ratio (wn) of the dehydrated cake discharged from the screw decanter centrifuge was about 100%. As a result of adding an appropriate amount of cement-based solidifying agent according to the moisture content ratio of the dehydrated cake, it was possible to transport the treated soil in a dump on the day after dehydration. The reforming dredged sludge cured in the temporary storage yard satisfied the required quality (cone index qc ≧ 400 kN/m2). The actual dredging amount was 17,157 m3 and the reformed soil volume after the addition of the cement-based solidifying agent was 6072 m3. By applying a volume reduction system, the volume reduction rate of dredged sludge was achieved at 35.4%.
Application Example of a Volume Reduction System for Dredged Sludge by Screw Decanter Centrifuge
In order to transport high-moisture sludge dredged in the sea area to a waste disposal site, it is essential to reduce the moisture content ratio of dredged sludge. Therefore, we devised a volume reduction system for high-moisture sludge and applied it at Dokai Bay located in Kitakyushu City. The volume reduction system consisted of a two-step process, a dewatering process and a cement reforming process. The moisture content ratio (wn) of the dredged sludge was more than 200%, and the moisture content ratio (wn) of the dehydrated cake discharged from the screw decanter centrifuge was about 100%. As a result of adding an appropriate amount of cement-based solidifying agent according to the moisture content ratio of the dehydrated cake, it was possible to transport the treated soil in a dump on the day after dehydration. The reforming dredged sludge cured in the temporary storage yard satisfied the required quality (cone index qc ≧ 400 kN/m2). The actual dredging amount was 17,157 m3 and the reformed soil volume after the addition of the cement-based solidifying agent was 6072 m3. By applying a volume reduction system, the volume reduction rate of dredged sludge was achieved at 35.4%.
Application Example of a Volume Reduction System for Dredged Sludge by Screw Decanter Centrifuge
Lecture Notes in Civil Engineering
Hazarika, Hemanta (editor) / Haigh, Stuart Kenneth (editor) / Chaudhary, Babloo (editor) / Murai, Masanori (editor) / Manandhar, Suman (editor) / Mizuno, Kenta (author) / Matsumoto, Kouji (author)
International Conference on Construction Resources for Environmentally Sustainable Technologies ; 2023 ; Fukuoka, Japan
2024-04-09
11 pages
Article/Chapter (Book)
Electronic Resource
English
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