為因應循環經濟發展趨勢，本研究針對氯鹼工業副產物——鹽泥之再利用前處理流程進行最佳化探討。實驗中採用自行設計之簡易壓濾設備進行操作，探討不同水洗程序參數下鹽泥中氯離子之溶出行為，藉以評估各操作條件對脫氯效率之影響。
本研究在固定水洗次數為4次的前提下，針對不同固液比與水洗時間對鹽泥脫氯效果進行系統性探討。結果顯示，雖然高固液比(S/L=1：9)於單次水洗下具備良好去除效果，但透過採用中等固液比(S/L=1：3)並配合分段水洗方式，同樣能達到相近的氯離子去除效率，顯示以較低用水量達成等效處理成效的可行性，有助於節約水資源並提升操作效率。而水洗時間方面，短時間(2至5分鐘)不利於氯鹽完全溶出，效率偏低；延長至30分鐘則提升有限，顯示出反應已趨於飽和，因此10分鐘為兼顧效率與成本之最適水洗時間。
在確定最佳水洗參數下(固液比為1：3、水洗時間10分鐘)，研究亦延伸探討水洗回流水的再利用效益。實驗結果指出，即使在回流水中仍含微量氯離子的情況下，氯離子總去除率依然高達97%，顯示水洗效率並未受到明顯影響。進一步透過XRD分析發現，處理後鹽泥中原有的氯鹽結晶訊號已消失，而可再利用之碳酸鈣與氫氧化鎂依然明確存在，證實回流水不僅不會影響脫氯效果，也不會損害鹽泥中可資源化成分的保留，展現本研究所建立水洗程序的穩定性與永續應用潛力。

With the rapid development of global technology and civilization, daily life has become more convenient, but this has also led to increased waste generation. As environmental awareness rises, the concept of “zero waste” is seen as an ideal solution.

This study examined how chloride salts leach from salt sludge through a four-step water washing process, focusing on the effect of different solid-to-liquid (S/L) ratios under a fixed washing time. Results showed that a lower S/L ratio of 1:3 with multiple washing steps achieved similar chloride removal efficiency as a single wash at a higher S/L ratio of 1:9. This suggests that using less water with multi-step washing can improve water use efficiency.
Further tests using an S/L ratio of 1:3 and four washing steps explored how washing time affects chloride removal. Short durations of 2 and 5 minutes led to poor results, and while extending to 30 minutes slightly improved initial removal, the overall effect was limited, indicating a saturation point. A 10-minute washing time was found to be optimal for balancing performance and efficiency.

After identifying the best conditions, the study explored reusing rinse water from later washing steps, which had lower chloride levels. With an S/L ratio of 1:3 and 10-minute washing time, chloride removal efficiency remained high at 97%. XRD analysis confirmed that the treated salt sludge still showed clear peaks of CaCO₃ and Mg(OH)₂, while chloride salt peaks disappeared, proving that rinse water reuse is both effective and stable without compromising the retention of valuable components in the salt sludge.

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