有鑑於台灣TFT-LCD廠排放高濃度含磷廢水，本研究利用人工配製模擬之含磷廢水，建立流體化床均質顆粒化技術，以亞鐵回收廢水中之磷酸鹽。
本研究使用Fe^(2+)作為反應的藥劑，先以瓶杯實驗進行化學沉澱實驗，藉由pH值、磷酸初始濃度、雙氧水添加濃度，去了解微溶物系之pH沉澱區間。在瓶杯實驗的基礎上，利用流體化床反應器製造均質顆粒，並以均質顆粒於流體化床中處理濃度為5 mM (150mg-P/L)之含磷溶液，探討pH值、鐵磷進料莫爾、雙氧水濃度及截面積負荷對於回收磷酸的影響。最後，再將流體化床反應器中所產生的均質顆粒取出，進行SEM、EDS、TGA及XRD的檢測。
於雙氧水及亞鐵除磷系統中，在pH值小於4.2的溶液中，添加雙氧水有助於提高亞鐵除磷的效果。在化學沉澱實驗中，pH值會影響除磷的效果。最佳操作pH值=2.5，除磷率為92.84%，磷酸濃度為0.35 mM（11 mg-P/L）。在流體化床除磷實驗中，出流水pH值會影響反應器之截面積負荷極限。最佳操作條件為：截面負荷=0.89 Kg-P/(m2hr)、H2O2/Fe2+進料莫爾比=0.6、pH值= 2.6、Fe/P進料莫爾比= 1.2，去除率可達94.8 %，顆粒化率達85.8 %。流體化床均質顆粒經過6小時鍛燒後，經資料庫比對，發現顆粒為Rodolicoite及Grattarolait晶型的混合物。均質顆粒溶於王水經ICP分析後，確認其Fe/P莫爾比例為1.01。
於亞鐵除磷系統，在化學沉澱實驗中，最佳操作pH值為6.13，此時，除磷率為92.75%，磷酸濃度為0.27mM（8.35 mg-P/L），殘餘溶解性鐵以亞鐵為主。在流體化床除磷實驗中，最佳操作條件為：截面負荷=0.96 Kg-P/(m2 hr)、pH值=5.6、Fe/P=1.5，除磷率為61.1%，顆粒化率為52%。經6小時鍛燒後，經資料庫比對，可得知流體化床均質顆粒為Rodolicoite及Grattarolait晶型之混合物。均質顆粒溶於王水經ICP分析後，確認其Fe/P莫爾比例為1.35。

The objective of this study was to focus on the recovery of phosphorus-containing wastewater from TFT-LCD factory by using Fluidized-bed Homogeneous Granulation Technology. In this study, synthesis phosphorus-containing wastewater was prepared in the laboratory.
In the first stage, ferrous cation was used as the coagulant to carry out the chemical precipitation. The optimal conditions for precipitating the metallic phosphate could be determined by the assessment of experimental parameters, including pH, initial concentration of phosphate hydrogen peroxide. Secondly, on the basis of results in chemical precipitation, parameters of FBHG were designed, including pH of effluent, molar ratio of ferric cation to phosphate, concentration of hydrogen peroxide and cross section loading for determining the optimal operating condition. The pellets from FBHG were determined by SEM, XRD and TGA.
In ferrous and hydrogen peroxide system, removal of phosphate was improved in the presence of hydrogen peroxide. In the chemical precipitation stage, the optimal pH was 2.50 and the phosphate removal was 92.8%. In FBHG stage, for a feed level of 5 mM-P (150 mg-P/L),the optimal parameters were loading =0.89 Kg-P/(m^2∙hr), H2O2/Fe2 molar ratio=0.6, pH_e = 2.6, Fe/P molar ratio= 1.2, 85.8 % of granulation ratio and 94.8 % of removal efficiency were achieved. After annealing, the XRD patterns indicated that pellets from FBHG were composed of the mixtures of Rodolicoite and Grattarolait.
In the chemical precipitation stage of ferrous system, the optimal pH was 6.13 and the phosphate removal was 92.7 %. In FBHG stage, for a feed level of 4 mM-P (120 mg-P/L),the optimal parameters were loading =0.96 Kg-P/(m^2∙hr), pH_e = 5.6, Fe/P molar ratio= 1.5, 52 % of granulation ratio and 61 % of removal efficiency were achieved. After annealing, the XRD patterns indicated that pellets from FBHG composed of the mixtures of Rodolicoite and Grattarolait.

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