Reduction of Turbidity during the Storm Period by Applied Magnetic Field
Date Issued
2006
Date
2006
Author(s)
Wang, Yung-Li
DOI
zh-TW
Abstract
In Taiwan, turbidity of rivers might rise to above 10000 NTU during rainstorm period which makes water treatment plants failed to supply applicative water. However, the technology of Magnetic Aggregation and Separation can offer an advantage of separating pollutant from water by magnetic force.
In this research, high turbidity water treated by magnetic aggregation method with applied magnetic field is studied and the operating parameters are appropriate dosage of magnetite particles, dosage of coagulant, water quality parameters and the strength of applied magnetic field. In addition, the feasibility of reusing magnetite particles is also discussed.
The results indicates that magnetite particles synthesized by Fe2+/Fe3+ mixing solution dripped into alkaline solution has the best efficiency of magnetic aggregation which also can be enhanced by magnetized magnetite particles. The method of Magnetic Aggregation and Separation can reduce the turbidity of raw water at different pH values, of different initial turbidity and from different areas. In addition, the addition of coagulant into Magnetic Aggregation Process can both reduce the dosage of magnetite particles and dosage cost. As for the recycle of magnetite particles, the regeneration percentage of magnetite particles treated by cationic surfactant can reach 99.8% and the magnetite particles regenerated by CTAB can also be reused up to 5 times.
Keywords：Turbidity, Magnetic Aggregation and Separation,
Magnetite particle (Fe3O4),
Applied magnetic field, Surfactant,
Regeneration percentage
Subjects
濁度
磁性絮聚分離
磁性顆粒
外加磁場
界面活性劑
再生率
Turbidity
Magnetic Aggregation and Separation
Magnetite particle (Fe3O4)
Applied magnetic field
Surfactant
Regeneration percentage
Type
thesis