Use of a seeder reactor to manage crystal growth in the fluidized bed reactor for phosphorus recovery

Kazuaki Shimamura, Hideyuki Ishikawa, Toshihiro Tanaka, Izumi Hirasawa

Research output: Contribution to journalArticle

6 Citations (Scopus)


The authors have been engaged in the development of a phosphorus recovery system capable of maintaining high recovery efficiencies, with the chemical cost suppressed. This time, they conducted demonstration tests of a fluidized bed magnesium ammonium phosphate reactor provided with a seeder reactor for the supernatant from anaerobic digestion using a pilot experimental plant with a wastewater treatment capacity of 20 m3/d. For the digestion supernatant with a phosphorus concentration of approximately 300 mg/L, the treated water phosphorus concentration was 10 to 25 mg/L, and the phosphorus recovery efficiency was more than 90%. Relative to the chemical cost in the case of magnesium chloride, the chemical cost in the case of magnesium hydroxide is approximately 40%. Thus, with the new system, it was possible to reduce the running cost while maintaining high recovery efficiencies.

Original languageEnglish
Pages (from-to)406-413
Number of pages8
JournalWater Environment Research
Issue number4
Publication statusPublished - 2007 Apr



  • Chemical nutrient removal
  • Crystallization
  • Fluidized bed
  • Magnesium ammonium phosphate
  • Struvite
  • Wastewater treatment

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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