2016 Fiscal Year Final Research Report
Why do humic substances inhibit the efficiency of water treatment process?
| Project/Area Number |
15K12236
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Modeling and technologies for environmental conservation and remediation
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
ADACHI Yasuhisa 筑波大学, 生命環境系, 教授 (70192466)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 水処理 / 凝集効率 / カチオン性高分子凝集剤 / 腐植物質 |
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| Outline of Final Research Achievements |
In order to clarify the effect of humic substances on the aggregation process of colloidal particles induced by cationic polymer flocculants, thickness of polymer adsorption layer, surface charge characteristics and aggregation rate in the optimal condition were investigated on the presence or absence of an anionic polymer, which were used as model humic substances. It was shown that the adsorption layer of the polymer flocculant formed on the particle surface remarkably shrank when the anionic polymer was added. It was also found that the electrophoretic mobility, which was almost zero under the optimum aggregation condition, increased with an increase of the added amount of the anionic polymer, and the aggregation rate decreased accordingly. It is inferred that the shrinkage of the polymer adsorption layer and the change of the surface charge characteristics might be factors of the aggregation inhibition mechanism by the anionic polymer.
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| Free Research Field |
環境工学
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