本研究取澄清湖原水，並以明礬及氯化鐵兩種混凝劑進行瓶杯
試驗，經快混、慢混及靜置後，取上澄液分析非氣提性溶解性有機物
(non-purgeable dissolved organic carbon) 及濁度之濃度，再計算其去除
率，並藉由兩種混凝劑之水化平衡方程式，分析兩參數在不同pH 及混
凝劑量被去除之機制。結果顯示，鐵鹽對溶解性有機物之去除效果，較
鋁鹽為佳，至於兩種混凝劑對濁度去除能力明顯優於溶解性有機物；兩
種混凝劑在沉降區，較高金屬離子濃度及低pH 值 (鋁鹽為5-6，鐵鹽為
4-7)之範圍對溶解性有機物之去除明顯較更高pH 為佳，另低pH 值時，
兩種金屬混凝劑對濁度之去除效果明顯受水中溶解性有機物被去除量
所影響。

In this research, pH-log[M] diagrams of coagulant, including
alum and ferric chloride, were selected to elucidate the mechanisms of the
removal for non-purgeable dissolved organic carbon (NPDOC) and turbidity
in coagulation process that simulated by jar test. Based on those results
conducted, it showed that NPDOC removal by iron salt was superior to that
by aluminum salt. Turbidity removal by both metal salts was higher than
that of NPDOC. In the settling zone, the removal of organic matter in low
pH was superior to that in the high pH. Regarding the settling zone with low
pH value, it revealed that turbidity removals by both metal salts were
apparently interfered by the amount of NPDOC removal in coagulation
process.