為提升處理效率，合成有機高分子凝聚劑在自來水淨水程序中之使用日益普遍，主要作為混凝時之助凝劑，以提高水中懸浮性顆粒之去除率。但是由於高分子聚合物本身的不純物及其可能的反應性，使得其安全性仍受到相當程度之質疑。本研究之目的即為探討高分子凝聚劑應用於自來水處理程序中時之行為變化與影響因子。以三種不同特性之黏土顆粒（高嶺土、鈣-蒙特土、伊萊石）模擬原水中之濁度來源，並選取國內常用之陰離子性、陽離子性與非離子性等高分子凝聚劑，在實驗室中模擬自來水之混凝、加氯程序，以了解其在飲用水處理程序中可能產生之效應，同時並探討其與原水中有機污染物間之交互行為。結果指出，高分子凝聚劑在混凝程序中會吸附至黏土表面，形成高分子凝聚劑/黏土凝聚複合物，改變黏土之表面特性，除可產生凝聚、沈降作用，提升膠體顆粒之去除效果外；同時可經由分佈作用吸附水中非離子性疏水有機化合物，而達到與濁度一併去除之效果。但在超過最佳劑量後，由於顆粒的再穩定化與過剩溶解性高分子凝聚劑之增溶作用，濁度與非離子性疏水有機污染物之去除效率均會降低。研究中同時發現，構成濁度之黏土表面具有催化特性，可促進高分子凝聚劑之氯化作用，導致加氯副產物大量生成。黏土之催化特性與其表面帶有之金屬陽離子種類相關，具較高價數之過渡金屬具有較強之催化能力，研究中採用黏土之催化能力大小依序為鈦-蒙特土＞鐵-蒙特土＞銅-蒙特土＞錳-蒙特土＞鈣-蒙特土＞鈉-蒙特土。形成之加氯副產物以鹵化甲烷類與芳香族為主，產量較大者包括氯仿、二氯甲烷、苯和甲苯等。添加兩種配位基於系統中後發現，由於黏土表面之金屬陽離子與配位基結合形成錯合物，催化效果受到明顯的抑制。

Synthetic organic polymers used to purify drinking water are severely limited in that their impurities and by-products harm human health. In this study, the behavior of organic polymer in drinking water purification processes was investigated. In the simulated drinking water purification processes, three kinds of commercial synthetic organic polymers were used as coagulant aids, and pure clays were used as the suspended solids sources. Experimental results indicated that adding organic polymers to the coagulation systems resulted in more extensive remove of nonionic organic compounds (NOCs) and turbidity. In coagulation and flocculation processes, the formation of clay/polymer complexes can facilitate the removal of NOCs in contaminated water. But when added polymer exceeded an optimum-dosage, the restabilization and solubility-enhancement decreased the removal rates of particles and NOCs. On the other hand, the suspended solids, which are composed of natural clays, could possibly provided a powerful reactive medium in which the reactions between adsorbed polymers and disinfectants (chlorine) could occur. The catalysis ability was influenced by the characteristics of clay surface, clays with transition metal catalyzed the reactions between the organic polymer coagulants and disinfectants (chlorine), and then formed a larger number of volatile organic compounds (VOCs) than those with non-transition metals. The major formatted products included halogenated methanes and aromatic compounds. The total formation potential of DBPs was depending upon the electron donated by the clay, very little is related for the BET surface area, following the order : Ti-montmorillonite ＞ Fe-montmorillonite ＞ Cu-montmorillonite ＞ Mn-montmorillonite ＞ Ca-montmorillonite ＞ Na-montmorillonite ＞ Talc. The source of exchangeable ion also played an important role on the catalytic ability of clay. When a strong chelating agent such as o-phenanthrolin or ethlenediamine was added, the formation of VOCs was strongly inhibited, demonstrating the important function of transition metal on the clay.

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