本研究中以不同純度之PACl混凝劑進行腐植酸混凝移除效能評 估，試驗中並以FTIR、Solid-state 27Al NMR及Wet SEM分析混凝後形 成膠羽，以了解參與混凝反應之腐植酸官能基、鋁水解物種及膠羽構 造型態等。彙整上述研究結果，結論條列如下:
1. 在不控制pH條件下，PACl-Al13混凝去除腐植酸所需之加藥量較 PACl-1 少，且最適加藥量之操作區間較寬。
2. 在酸性時(pH 4~6)均有利於PACl-1 及PACl-Al13混凝處理腐植酸。
在pH 6 時，PACl-Al13對有機物之混凝機制以螯合鍵結及電性中和 為主，去除DOC所需之加藥量較少，而以膠體鋁為主成 份之 PACl-1，以沉澱掃除機制為主，去除DOC所需之加藥量較多。
3. PACl-1 及PACl-Al13混凝腐植酸所形成之膠羽經Solid-state 27Al NMR分析結果顯示，PACl-1 及PACl-Al13中部份Al13會腐植酸反 應，並被裂解成寡聚體鋁。
4. PACl-1 及PACl-Al13混凝腐植酸所形成之膠羽經FTIR分析結果顯 示，在pH 6 時，PACl-1 及PACl-Al13對腐植酸之混凝移除效果佳，
此時鋁物種主要與腐植酸之羧基反應；在pH 8 時，酚基開始與鋁 物種作用，此時需增加PACl-Al13加藥量，才可有效地去除腐植酸。
5. PACl-1 及PACl-Al13混凝腐植酸所形成之膠羽經濕式SEM觀察發 現，在pH 6 時，PACl-1 混凝形成之膠羽呈長鏈狀，而PACl-Al13混 凝形成之膠羽較捲曲。在pH 8 時，高PACl-Al13混凝劑量下所形成 之膠羽結構更為密實且趨近球狀。
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