高純度聚氯化鋁混凝劑之製備及應用

Abstract

聚氯化鋁混凝劑之純度對混凝處理效能影響甚巨。本研究之目的主要探討高純度聚氯化鋁之混凝機制及其應用特性。第一年研究中以化學法製備不同純度聚氯化鋁(如不同含量之聚鋁物種)，及以Ferron法及NMR分析其鋁型態分佈，以評估高純度聚氯化鋁對濁度之混凝效能。此外，利用小角度靜態光散射儀及液態掃描式電子顯微鏡設備分析及觀察混凝之膠羽特性。同時，以原子力顯微鏡於液相中量測高純度聚氯化鋁之分子結構與其混凝顆粒與顆粒間之作用力。第二年研究主要探討高純度聚氯化鋁混凝有機物之作用機製，首先以不同樹脂將天然有機物分離為不同分子量及親疏水性部分後，再評估高純度聚氯化鋁對不同有機物之混凝效能及膠羽結構分析。第三年研究將高純度聚氯化鋁混凝之特性，應用於淨水場原水混凝，將模廠管柱快混反應器與水廠現場快混操作比較，並搭配光纖膠羽偵測儀之使用，以評估水廠原水應用高純度聚氯化鋁混凝之顆粒聚集動力。

The purity of PACl has a profound effect on coagulation performance. The aim of this study is to investigate the coagulation mechanisms of high-purity PACl and its practice. In the first year, the different purity of PACl (e.g., the percentage of polyaluminum species) will be prepared by chemical method and analyzed by Ferron as well as NMR method to evaluate its effects on the coagulation efficiency of turbidity. In addition, a small angle static light scattering and wet SEM will be used to analysis and observe the properties of floc. Meanwhile, atomic force microscope is applied to measure the dimension structure of PACl as well as the interparticle reaction forces. In the second year, the coagulation mechanism of high-purity PACl in removing organic matter will be evaluated. The characteristics of natural organic matter (NOM) will be analyzed by different resins to fractionate their molecular weights as well as their hydrophobic ability. After that, the coagulation efficiency of organic matter by relatively pure PACl will be examined and then floc structure will be analyzed. In the third year, the high-purity PACl will be applied on the coagulation of raw water in-situ. The efficiency of instantaneous flash mixer (IFM) and real rapid mixing in water treatment plant will be compared. By using the photometric dispersion analyzer (PDA), the aggregation kinetic of particles can be estimated.