Magnesium phosphate crystallization in a fluidized-bed reactor: Effects of pH, Mg:P molar ratio and seed

doi:10.1016/j.seppur.2014.01.019

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Periodical Articles > Item 310902800/28618

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/28618

Title:	Magnesium phosphate crystallization in a fluidized-bed reactor: Effects of pH, Mg:P molar ratio and seed
Authors:	Su, Chia-Chi Dulfo, Lorenz Docena Dalida, Maria Lourdes P. Lu, Ming-Chun
Contributors:	環境資源管理系
Keywords:	Phosphate Fluidized-bed reactor Crystallization Recovery Characterization Morphology
Date:	2014-04
Issue Date:	2015-05-06 21:22:42 (UTC+8)
Publisher:	Elsevier Science Bv
Abstract:	The effects of influent pH, the magnesium:phosphate (Mg:P) molar ratio, seed type and inorganic ions (F-, SO42- and NO3-) on phosphate removal were investigated in a fluidized-bed reactor (FBR). Environmental scanning electron microscopy (ESEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) were used to characterize the products collected from the FBR. Experimental results show that pH and the Mg:P molar ratio played significant roles in phosphate removal. Increasing the influent solution pH from 10 to 12 increased the final phosphate removal from 55% to around 100%. At influent solution pH of 8, increasing the Mg:P molar ratio from 1 to 1.5, and 2 raised the phosphate removal as well to 17%, 28% and 34%, respectively. The seed used and its presence had an effect on the initial phosphate removal rate. Phosphate removal efficiencies were 86%, 88% and 93% for the unseeded FBR, the FBR seeded with calcium phosphate and the FBR seeded with magnesium phosphate, respectively. The inorganic ions in simulated thin film transistors-liquid crystal display (TFT-LCD) wastewater did not significantly impact the phosphate removal. The XRD analysis confirmed that several magnesium phosphate species formed in all FBR experiments. (C) 2014 Elsevier B.V. All rights reserved.
Relation:	Separation and Purification Technology, v.125, pp.90-96
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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