本研究之重點在於探討不同混凝劑對自然原水中溶解性有機物(NOM)之去除。原水取自鳳山及路竹兩淨水廠之進流原水，其分別來自不同之水庫。以明礬及氯化鐵為混凝劑，進行混凝瓶杯試驗。對原水及混凝後之上澄液，除分析溶解性有機碳(NPDOC)、UV254、比UV吸光值(SUVA)等與有機物有關之參數外，另外更利用高效能粒徑排除層析儀(high performance size exclusion chromatography, HPSEC)串聯UV-VIS、螢光及DOC三種偵測器，及螢光激發/發散陣列光譜儀(excitation/emission matrixs spectrofluorometer, EEMs)，將原水中NOM依其分子量大小及特性分成不同之族群，以觀察不同混凝劑對NOM中不同族群之去除狀況。
實驗結果顯示鳳山原水中所含NOM，以來自生物源之大分子生物聚合物及小分子酸為主，而路竹原水則以來自陸源之腐植質為主。明礬較之氯化鐵對鳳山原水之NPDOC有較高之去除率，反之，氯化鐵對路竹原水之NPDOC有較高之去除率。根據HPSEC及EEMs之分析，可知其原因在於明礬對生物聚合物有較佳之去除率，而氯化鐵則對腐植質有較佳之去除率。

The object of this research focuses on the NOM removal from natural water by different coagulants. Two kinds of raw water, which were the influent of the Feng-Shan (FS) and Lu-Jhu (LJ) Water Treatment Plant, respectively, were collected and studied. Conventional jar tests were conducted, with alum and ferric chloride as coagulant. Comprehensive dissolved organic analyses were performed for both raw water and the supernatants from jar test. In addition to the gross dissolved organic parameters, such as non-purgeable dissolved organic carbon (NPDOC), UV254, and specific UV absorbance (SUVA), the NOM were also characterized by both high-pressure size exclusion chromatography (HPSEC), which consisted of a high-performance liquid chromatography with UV-VIS, fluorescence, and on-line DOC detectors in series, and fluorescence excitation-emission matrix (EEM) spectrometry.The purpose is to look into the effect of different coagulants on the removal of various organic fractions.
The results show that the NOM in the source water from FS were dominated by microorganism-related extracellular polymer substance and low molecular weight acids, while that from LJ were dominated by humic substance, probably from the terrestrial source. Based on the results from jar tests, alum was found to have higher DOC removal on source water from FS than ferric chloride, while ferric chloride was superior to alum for source water from LJ. Based on the results from HPSEC and EEMs, these can be explained by the higher removal efficiency of microorganism- related extracellular polymer substance by alum, while ferric chloride has higher efficiency for humic substance removal.

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