Fluidized bed reactor for fluoride removal

被引：80

作者：

Aldaco, R ^{[1
]}

Irabien, A ^{[1
]}

Luis, P ^{[1
]}

机构：

[1] Univ Cantabria, ETSII & T, Dept Quim Inorgan & Ingn Quim, E-39005 Santander, Spain

来源：

CHEMICAL ENGINEERING JOURNAL | 2005年 / 107卷 / 1-3期

关键词：

fluidized bed reactor; crystallization; precipitation; fluoride removal;

D O I：

10.1016/j.cej.2004.12.017

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The common methods for fluoride removal from industrial wastewater involve chemical precipitation. This process generates large amounts of a water rich sludge requiring disposal with increasing costs. Due to the high water content and the low quality of the sludge, reuse of fluoride is not an economical option. The crystallization in a fluidized bed reactor offers an alternative to the conventional precipitation. The influence of the supersaturation and recycling conditions in order to control the efficiency of the process was studied. A high supersaturation level decreases the fluoride removal efficiency due to the formation of small particles (fines). The main mechanism concerning the precipitation of calcium fluoride in a fluidized bed was established. Fines were produced by nucleation in liquid phase (homogeneous and secondary nucleation) in the reactor and the dilute fluoride tank, in order to decrease the amount of fines it is very important the control of the supersaturation. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：113 / 117

页数：5

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