抄録
High gradient magnetic separation (HGMS) can be one of the promising ways for a new environmental purification technique because of producing no contamination such as flocculants and having possibility of treating large amount of wastewater within a short time. The magnetic separation system for purification of wastewater has been developed. The test plant of 2000 ton/day was set up in the actual paper manufacturing process and a purification test of the wastewater was performed. The magnetic seeding of the organic pulp and dyes were successfully performed and the Chemical Oxygen Demand (COD) value for recycling was reached to less than 40 ppm after magnetic separation. In the present review, typical processes of magnetic seeding were classified and applicability of magnetic seeding processes using ferromagnetic microparticles was discussed. Some examples of magnetic seeding processes developed in 1970 to 2000 were reviewed and a guideline for how to choose the ferromagnetic micro/nanoparticles was described when a magnetic seeding process will be employed.
