Phosphorus recovery in a fluidized bed crystallization reactor

Kazuaki Shimamura, Izumi Hirasawa, Hideyuki Ishikawa, Toshihiro Tanaka

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    A process for recovering phosphorus from wastewater in form of magnesium ammonium phosphate (MAP) crystals using a fluidized bed reactor was investigated. The phosphorus recovery ratio was found to be influenced by the particle size of the MAP crystals, as well as the reaction pH, inlet ammonium and phosphorus concentration. The optimum operation conditions for the fluidized bed reactor to achieve the maximum recovery rate of phosphorus were organized in terms of the supersaturation ratio and reaction pH. The best supersaturation ratio was found to be 3.7. The optimum reaction pH depended on the inlet phosphorus concentration and was found to be 7.9 when the inlet PO4-P was 230 mg·L-1. A continuous treatment of filtrate from digested sludge was performed based on these optimum operation conditions and using a newly proposed fluidized bed system. The fluidized bed system has a seeder, which allowed control of the particle size distribution inside the crystallization tower. A recovery ratio higher than 90% was achieved for a long period of the demonstration test in this new fluidized bed system.

    Original languageEnglish
    Pages (from-to)1119-1127
    Number of pages9
    JournalJournal of Chemical Engineering of Japan
    Volume39
    Issue number10
    DOIs
    Publication statusPublished - 2006 Oct 20

    Fingerprint

    Crystallization
    Fluidized beds
    Phosphorus
    Recovery
    Supersaturation
    Magnesium
    Phosphates
    Crystals
    Ammonium Compounds
    Particle size analysis
    Towers
    Wastewater
    Demonstrations
    Particle size
    ammonium phosphate

    Keywords

    • Crystallization
    • Fluidized-bed
    • Magnesium ammonium phosphate
    • Phosphate recovery
    • Supersaturation

    ASJC Scopus subject areas

    • Chemical Engineering(all)

    Cite this

    Phosphorus recovery in a fluidized bed crystallization reactor. / Shimamura, Kazuaki; Hirasawa, Izumi; Ishikawa, Hideyuki; Tanaka, Toshihiro.

    In: Journal of Chemical Engineering of Japan, Vol. 39, No. 10, 20.10.2006, p. 1119-1127.

    Research output: Contribution to journalArticle

    Shimamura, Kazuaki ; Hirasawa, Izumi ; Ishikawa, Hideyuki ; Tanaka, Toshihiro. / Phosphorus recovery in a fluidized bed crystallization reactor. In: Journal of Chemical Engineering of Japan. 2006 ; Vol. 39, No. 10. pp. 1119-1127.
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