Removal of arsenic from geothermal water by high gradient magnetic separation

A. Chiba, H. Okada, T. Tada, H. Kudo, H. Nakazawa, K. Mitsuhashi, T. Ohara, H. Wada

Research output: Contribution to journalConference articlepeer-review

16 Citations (Scopus)


On-site experimentation of high gradient magnetic separation (HGMS) for arsenic removal from geothermal water has been conducted using a high-TC superconducting magnet. This development of an effective method for decontamination of geothermal water is currently being done at the Kakkonda geothermal power plant in Shizukuishi, Iwate, Japan. In order to enhance the magnetic properties of the arsenic-containing particles in geothermal water, three different petreatment methods were used: I) the ferrite formation method; II) the ferric hydroxide coprecipitate method: and III) the modified ferric hydroxide coprecipitate method. The conditions of the HGMS experiments were a 1.7 T applied magnetic field and 100°C water at a flow rate of 10 L/min. Percentages of the arsenic-removal were strongly dependent on the pretreatment methods, because of a very small magnetization of the arsenic. Arsenic-removal rates of 40%, 80%, and 90% were obtained by petreatments I, II, and III, respectively. Although the environmental standard for arsenic is 0.01 mg/L, corresponding to a 99% removal rate, could not be achieved in the present experiments, it can be thought that HGMS substantiates the achievement of environmental standards for arsenic, if an optimized petreatment method is taken.

Original languageEnglish
Pages (from-to)952-954
Number of pages3
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2002 Mar
Externally publishedYes
Event17th Annual Conference on Magnet Technology - Geneva, Switzerland
Duration: 2001 Sept 242001 Sept 28


  • Arsenic
  • Geothermal water
  • High gradient magnetic separation
  • Superconducting magnet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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