本研究係利用鈣系化學過氧沉澱法在室溫下處理高濃度含硼廢水([B] = 1000 ppm)，並比較開放與密閉系統之間的差異性以推斷其反應機制。化學過氧沉澱法藉由雙氧水將水中的硼轉變為易於沉澱的過硼酸陰離子，使其在室溫下即可與作為鹼土金屬之沉澱劑產生難溶性鹽類，進而有效地去除水中的硼。研究結果發現在開放系統中，由於操作在鹼性條件下，空氣中的二氧化碳易隨著時間逐漸溶入溶液中形成碳酸根，進而與鈣產生具有共混凝效果的碳酸鈣，故相較於密閉系統，鈣系化學過氧沉澱法於開放系統中可以得到較好的去除效果，開放系統操作在最佳反應條件下(CB,0 = 1000 ppm, [H2O2]/[B] = 3, [Ca]/[B] = 1, pHr = 11, pHp = 10.5, timep = 15 min.)，可將硼濃度自1000 ppm降至30 ppm，去除率達97 %，而密閉系統僅能將硼濃度降至60 ppm。然而研究發現，在開放系統中溶液中的碳酸根濃度會隨著空氣中二氧化碳的溶入而上升，其會開始與過硼酸陰離子競爭作為沉澱劑的鈣離子，造成硼濃度的回升，因此空氣中的二氧化碳對於開放系統鈣系化學過氧沉澱法具有非常重大的影響力。

This work investigated the comparison of boron removal from simulated wastewater by calcium-based chemical oxo-precipitation (COP) in open and closed system. In a calcium-based COP process, H2O2 is applied to precondition the boric acid in solution to yield various species of perborate anions, which can be efficiently precipitated as calcium perborate by using calcium chloride. By comparing two system, different reaction behaviors were observed during the reaction. The higher efficiency of boron removal was attained in open system, attributed to the dissolution of carbon dioxide. Nevertheless, as the reaction time increased, the dissolving carbonate would compete with perborate in consuming calcium by formation of calcium carbonate, leading to the decreasing efficiency of COP. Without the interference of carbon dioxide, it would produce calcium peroxide instead in closed system. Therefore, the dissolution of carbon dioxide from atmosphere was very critical to calcium-based COP process. In an open system, at specific conditions: [H2O2]/[B] = 3, [Ca]/[B] = 1, pHp = 10.5, timep = 15 min, pHr = 11, more than 97 % of boron could be reduced from 1000 ppm to lower than 30 ppm within 30 minutes; whereas in a closed system, at specific conditions: [H2O2]/[B] = 3, [Ca]/[B] = 1.25, pHp = 10.5, timep = 15 min, pHr = 10.5, the boron level could be reduced to 60 ppm. The precipitates from two system were all amorphous by XRD and Raman microscopy indicated that calcium perborates were mainly Ca(B(OH)3OOH)2 in both system.

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