2013 Fiscal Year Final Research Report
High-Level Reduction of Organic Sludge by Multistage Ultrahigh-Pressure Dewatering Combined with Reversible Flocculation
| Project/Area Number |
24656467
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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(系)研究科(研究院), 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) |
2012-04-01 – 2014-03-31
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| Keywords | 可逆凝集 / 超高圧脱水 / 廃棄物 / 汚泥 / 減量化 / 圧搾 / 含水率 / 空隙率 |
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| Research Abstract |
Multistage ultrahigh-pressure expression combined with reversible flocculation accomplished high-level reduction in volume of organic sludge. The water content of the compressed cake produced from excess activated sludge was finally reduced to 23 wt% by ultrahigh-pressure expression conducted at 50 MPa combined with reversible flocculation using inorganic electrolyte with multivalent cation. This new method reduced the sludge volume by 99.87 %. The relation between the average porosity of the compressed cake and the applied expression pressure suggests that the water content of activated sludge may be further reduced by greater expression pressure. It was shown that the complicated kinetics of expression of activated sludge under the ultrahigh-pressure condition was accurately described using the newly developed multistage creep model and that the model will be beneficial in evaluating the dewatering performance under various operating conditions.
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