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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/32199

    標題: Phosphorous recovery by means of fluidized bed homogeneous crystallization of calcium phosphate. Influence of operational variables and electrolytes on brushite homogeneous crystallization
    作者: Caddarao, Patrick S.
    Garcia-Segura, Sergi
    Ballesteros, Florencio C., Jr.
    Huang, Yao-Hui
    Lu, Ming-Chun
    貢獻者: Univ Philippines, Coll Engn, Environm Engn Grad Program
    Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
    Natl Cheng Kung Univ, Sustainable Environm Res Ctr, Dept Chem Engn
    關鍵字: Fluidized-bed reactor
    Phosphate homogeneous crystallization
    Water treatment technologies
    Granulation process
    Phosphate removal
    日期: 2018-02
    上傳時間: 2019-11-15 15:44:52 (UTC+8)
    摘要: Phosphate recovery from wastewaters is one of the major engineering challenges to securing the worldwide food production. Fluidized-bed heterogeneous crystallization of struvite has been one of the most considered technologies. Nevertheless, the recovery of other phosphate products could be of the major interest at industrial level. Thus, in this work we present the recovery of calcium phosphate salts as brushite by a novel fluidized-bed homogeneous crystallization (FBHC) process. The no requirement of seeds in FBHC reactor allows obtaining high-purity crystals. The operational parameters of the FBHC process have been optimized in order to achieve the higher degree of granulation and to obtain the most homogeneous distribution of granules sizes. Thus, the treatment of 1500 mg/L of phosphate at pH 9.0 with a ratio of 1.2:1.0 of [Ca2+]:[PO43-](T) leads to the obtaining of ca. 90% of granulation with crystals of 0.5 mm of diameter. The influence of electrolytes typically found in TFT-LCD industry has been further considered. The characterization of the spheroidal crystals obtained allowed identifying brushite (calcium hydrogenphosphate salt) as unique crystal phase. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
    Appears in Collections:[環境資源管理系(所)] 期刊論文

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