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Phosphate recovery as vivianite using a flow-electrode capacitive desalination (FCDI) and fluidized bed crystallization (FBC) coupled system
Water Research ( IF 11.4 ) Pub Date : 2021-02-18 , DOI: 10.1016/j.watres.2021.116939
Changyong Zhang , Xiang Cheng , Min Wang , Jinxing Ma , Richard Collins , Andrew Kinsela , Ying Zhang , T. David Waite

It is critical to both effectively remove and recover phosphate (P) from wastewater given the wide-ranging environmental (i.e., preventing eutrophication and restoring water quality) and economic (i.e., overcoming P resource scarcity) benefits. More recently, considerable academic effort has been devoted towards harvesting P as vivianite, which can be used as a potential slow-release fertilizer and possible reagent for the manufacture of lithium iron phosphate (LiFePO4), the precursor in fabricating Li-ion secondary batteries. In this study, we propose an innovative P recovery process, in which P is first preconcentrated via a flow-electrode capacitive deionization (FCDI) device followed by immobilization as vivianite crystals in a fluidized bed crystallization (FBC) column. The effects of different operational parameters on FCDI P preconcentration performance and energy consumption are investigated. Results show that 63% of P can be removed and concentrated in the flow-electrode chamber with a reasonable energy requirement under optimal operating conditions. The FBC system resulted in immobilization of ~80% of P as triangular or quadrangular pellets, which were verified to be high-purity vivianite crystals by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and extended X-ray absorption fine structure (EXAFS) spectroscopy. This study provides a pathway for efficient recovery of P as a value-added product (i.e., vivianite) from P-rich wastewaters.



中文翻译:

使用流电极电容脱盐(FCDI)和流化床结晶(FBC)耦合系统将磷矿回收为堇青石

考虑到广泛的环境(即,防止富营养化和恢复水质)和经济(即,克服磷资源的匮乏)的好处,有效地从废水中去除和回收磷酸盐(P)至关重要。最近,人们投入了相当多的学术努力来收获磷(如堇青石),它可以用作潜在的缓释肥料和生产磷酸铁锂的潜在试剂(LiFePO 4),是制造锂离子二次电池的前身。在这项研究中,我们提出了一种创新的P回收工艺,其中P首先通过流电极电容去离子(FCDI)装置进行预浓缩,然后固定为流化床结晶(FBC)柱中的Vivianite晶体。研究了不同操作参数对FCDI P预浓缩性能和能耗的影响。结果表明,在最佳操作条件下,可以以合理的能量要求将63%的P去除并富集在流电极室中。FBC系统将约80%的P固定为三角形或四边形小球,通过扫描电子显微镜,能量色散X射线能谱(SEM-EDX)和扩展X射线吸收精细结构(EXAFS)光谱被证实是高纯度的堇青石晶体。这项研究提供了一条途径,可从富含磷的废水中有效回收作为增值产品(即,云母石)的磷。

更新日期:2021-02-26
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