本研究主要在開發一種新的電子工業用磷酸鹽和含銨廢水的處理技術，以生產高純度的鳥糞石。結合來自相同來源的含氨廢水，含磷廢水，加入氯化鎂，以誘導磷酸銨鎂（MgNH4PO4，鳥糞石）沉澱。實驗結果表明，當[PO4-3]：[Mg2+]：[NH4+]的摩爾比為1：1：1和pH 9時，磷酸鹽在初始磷酸鹽濃度為1,000~20,000 mg/L時去除率為80~90％。另外，當初始磷酸鹽濃度增加時，所得產物的形態從棒狀轉變為細顆粒。因此，可以得出結論，初始磷酸鹽濃度是關鍵參數，並且顆粒尺寸和形態之間存在強相關性。通過FESEM、XRD和濕式化學分析證實了在不同反應條件下產生的鳥糞石的形成。用PHREEQC對理論平衡進行建模，並與實驗結果進行比較。我們也設計了由10公升反應器組成的規模放大系統，化學品也採用工業級，我們評估了放大系統在工廠中的潛在應用。但磷酸鹽的回收磷酸鹽，殘餘磷酸濃度超過台灣放流水標準。我們建議採用二階段串聯沉澱裝置，其中加入氯化鈣以誘導磷灰石（Ca5（PO4）3OH）的形成。

The proposed study aims to develop a novel treatment technology for phosphate and ammonium-containing wastewaters from electronics industries to produce high- purity struvite. Combining ammonia-containing wastewater phosphate-containing wastewater from an identical source, it will be dosed with magnesium chloride to induce precipitation of magnesium ammonia phosphate (MgNH4PO4, struvite), a potentially reusable mineral. Experimental results indicated that when molar ratio of [PO4-3]:[Mg2+]:[NH4+] of 1:1:1 and pH 9, phosphate were removed 80~90 % at initial phosphate concentration from 1,000 to 20,000 mg/L. Moreover, when initial phosphate concentration increased, the morphology of the obtained products was shifted from rod-shaped to a fine particle. Therefore, it could be concluded that initial phosphate concentrations was a critical parameter and there was a strong correlation between particle size and morphology. The formation of struvite, as produced under different reaction conditions, were confirmed by FESEM, XRD, and wet chemical analysis. Theoretical equilibria were modeled with PHREEQC and compared with experimental results. A pilot scale system consisting of a 10-dm3 reactor was used. Not only the volume of wastewater was from 500 ml to 10 L, but also industrial grade chemicals were used. The scale-up system was evaluated for potential applications in the factory. However, recovery of phosphate as magnesium phosphate, the effluent cannot meet of effluent standards of Taiwan EPA. To ensure effluent quality, a 2-stage in-series precipitation unit is proposed in which calcium chloride is added to induce the formation of hydroxyapatite (Ca5(PO4)3OH).

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