Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR)
碩士 === 國立成功大學 === 化學工程學系碩博士班 === 100 === This work explores a novel homogeneous nucleation and crystallization technology using a Fluidized-bed reactor (FBR) for phosphate removal. Meanwhile, a support-free metallic phosphate orb with high purity and low water content can be generated. First, Ba2+...
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ndltd-TW-100NCKU50630732015-10-13T21:33:37Z http://ndltd.ncl.edu.tw/handle/29987162874346271166 Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) 以流體化床反應器開發均相成核與結晶之新穎除磷技術 Hua-ChiangChang 張華強 碩士 國立成功大學 化學工程學系碩博士班 100 This work explores a novel homogeneous nucleation and crystallization technology using a Fluidized-bed reactor (FBR) for phosphate removal. Meanwhile, a support-free metallic phosphate orb with high purity and low water content can be generated. First, Ba2+ and Sr2+ cations were used as the coagulant reagent to carry out the chemical precipitation. The optimal conditions for precipitating the metallic phosphate sludge could be determined by the assessment of experimental parameters, including pH and molar ratios of metal to phosphate (Ba/P、Sr/P). Second, on the basis of the optimal conditions in chemical precipitation process, the hydraulic system (up-flow speed and cross-section loading) and effluent pH in FBR were further discussed to obtain the metallic phosphate orb through the homogeneous nucleation and crystallization mechanism. The homogeneous nucleation and crystallization process has proven to successfully solve the problems of producing large amounts of sludge in conventional chemical precipitation method. In chemical precipitation stage, the phosphate removal and the components of sludge would strongly depend on the pH and Ba/P molar ratio. The precipitates could be BaHPO¬4 and Ba5(PO4)3OH by pH condition at the corresponding values. On the other hand, the majority of precipitates using Sr2+ is Sr5(PO4)3(OH) and SrHPO4, and the efficiency of phosphate removal is affected by the Sr/P molar ratio. In homogeneous nucleation and crystallization stage, the hydraulic condition did not affect the total phosphate removal (TP%) and crystallization ratio of phosphate (CP%). Besides, the extent of supersaturation by controlling the effluent pH played an important role on the particle size distribution of metallic phosphate orb. Finally, the homogeneous nucleation and crystallization process was undertaken using Ca2+, Mg2+, Mn2+ and Cu2+ cations to in turn experience the phosphate removal by the careful examination of hydraulic conditions. Yao-Hui Huang 黃耀輝 2012 學位論文 ; thesis 107 zh-TW |
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碩士 === 國立成功大學 === 化學工程學系碩博士班 === 100 === This work explores a novel homogeneous nucleation and crystallization technology using a Fluidized-bed reactor (FBR) for phosphate removal. Meanwhile, a support-free metallic phosphate orb with high purity and low water content can be generated. First, Ba2+ and Sr2+ cations were used as the coagulant reagent to carry out the chemical precipitation. The optimal conditions for precipitating the metallic phosphate sludge could be determined by the assessment of experimental parameters, including pH and molar ratios of metal to phosphate (Ba/P、Sr/P). Second, on the basis of the optimal conditions in chemical precipitation process, the hydraulic system (up-flow speed and cross-section loading) and effluent pH in FBR were further discussed to obtain the metallic phosphate orb through the homogeneous nucleation and crystallization mechanism. The homogeneous nucleation and crystallization process has proven to successfully solve the problems of producing large amounts of sludge in conventional chemical precipitation method.
In chemical precipitation stage, the phosphate removal and the components of sludge would strongly depend on the pH and Ba/P molar ratio. The precipitates could be BaHPO¬4 and Ba5(PO4)3OH by pH condition at the corresponding values. On the other hand, the majority of precipitates using Sr2+ is Sr5(PO4)3(OH) and SrHPO4, and the efficiency of phosphate removal is affected by the Sr/P molar ratio.
In homogeneous nucleation and crystallization stage, the hydraulic condition did not affect the total phosphate removal (TP%) and crystallization ratio of phosphate (CP%). Besides, the extent of supersaturation by controlling the effluent pH played an important role on the particle size distribution of metallic phosphate orb. Finally, the homogeneous nucleation and crystallization process was undertaken using Ca2+, Mg2+, Mn2+ and Cu2+ cations to in turn experience the phosphate removal by the careful examination of hydraulic conditions.
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author2 |
Yao-Hui Huang |
author_facet |
Yao-Hui Huang Hua-ChiangChang 張華強 |
author |
Hua-ChiangChang 張華強 |
spellingShingle |
Hua-ChiangChang 張華強 Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
author_sort |
Hua-ChiangChang |
title |
Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
title_short |
Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
title_full |
Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
title_fullStr |
Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
title_full_unstemmed |
Development of Novel Phosphate Removal Technology by Homogeneous Nucleation and Crystallization in Fluidized-Bed Reactor (FBR) |
title_sort |
development of novel phosphate removal technology by homogeneous nucleation and crystallization in fluidized-bed reactor (fbr) |
publishDate |
2012 |
url |
http://ndltd.ncl.edu.tw/handle/29987162874346271166 |
work_keys_str_mv |
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