2011 Fiscal Year Final Research Report
Development of High-Speed and High-Level Reduction Process of Difficult-to-Dewatering Sludge by Combined Reversible Flocculation and Multistage Ultrahigh-Pressure Expression System
| Project/Area Number |
22656175
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Properties in chemical engineering process/Transfer operation/Unit operation
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| Research Institution | Nagoya University |
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Principal Investigator |
IRITANI Eiji 名古屋大学, 工学研究科, 教授 (60144119)
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| Co-Investigator(Kenkyū-buntansha) |
KATAGIRI Nobuyuki 名古屋大学, 大学院・工学研究科, 助教 (00345919)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 可逆凝集 / 超高圧圧搾 / 廃棄物 / 汚泥 / 減量化 / pH / 電解質 / 脱水 |
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| Research Abstract |
High rate reduction in volume of difficult-to-dewatering sludge was achieved by step-up ultrahigh-pressure expression combined with reversible flocculation. Flocculation with inorganic electrolyte with multivalent cation such as poly aluminum chloride was extremely effective for the increase in the dewatering rate of excess activated sludge, and the water content of the compressed cake was finally reduced to 31wt% by expression under action of ultrahigh-pressure of 15 MPa combined with reversible flocculation. This new method shortened the total dewatering time of activated sludge by 51. 6% compared to the conventional method, and reduced the sludge volume by 99. 83%. The results derived from a series of experiments attained the research goals from the viewpoint of both the rate in dewatering and the water content of the compressed cake.
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