離島水庫水質優養化程度高，藻類釋出蛋白質及胺基酸、水淺陽光直射使底泥腐植質釋出、集水區雨水逕流帶出黃酸和腐植酸，再加上水庫缺乏循環活化，上述濃度高且來源複雜的天然有機物（Natural Organic Matter, NOM）長時間累積於水體，使離島水庫構成特殊之「優養-高有機碳」水質特性，水中總有機碳（Total Organic Carbon, TOC）濃度幾乎無法符合飲用水水源水質標準。澎湖成功水庫夏、秋兩季（豐水期）TOC濃度介於6-10 mg/L，冬、春季（枯水期）介於9-14mg/L，水庫高TOC濃度增加處理成本與消毒副產物生成風險。
複合濾料水質淨化系統(Multi-Soil-Layering, MSL)是一種源自日本的土壤滲濾改良工法，其將土壤與鐵、碳粉及有機質等複合濾料包覆在磚型土工包內強化土壤功能，再透過土工包層與沸石或礫石構成的透水層之成層磚砌結構改善阻塞與短流。因此，相較於傳統土壤處理工法，MSL具有進流水濃度接受範圍寬，面積負荷率高，且能強化土壤對懸浮物、營養鹽及有機物淨化功能之優點。本研究於澎湖成功水庫旁設置最大處理量40 CMD的MSL試驗模場(4槽MSL獨立操作、4個MSL槽的土工包分別以不同比例的複合濾料混合現地土壤調配而成、面積負荷率為500-3000 L/m2/day)，進流水取自水庫，先通過工研院專利生物網膜系統(BioNet)前處理後再進入MSL單元。利用現地模場能處理季節性變動原水水質之優勢，本研究完整評析MSL在動態水質變化下，對TOC的去除效果，並以逐步集群分析法建立水庫原水水質參數、環境因子等連續性變數與TOC去除率關係之模型，同時結合螢光激發/發射陣列光譜、平均螢光強度分析與平行因子分析方法解析水庫原水NOM成分及其在模場淨水程序（BioNet及MSL）中的變化，探討原水中NOM可能的來源與特性，並進一步討論NOM去除機制。
試驗期間BioNet在進流量為15–40 CMD，HRT為1.4–3 hr的操作條件下，對TOC之平均去除率僅6–18%，且出流水無法符合飲用水水源水質標準。MSL對TOC去除率有明顯季節性變化，去除率介於20–60%，夏、秋季時，在HLR為1000–2000 L/m2/d的操作條件下，出流水TOC濃度可符合飲用水水源水質標準，冬、春季時，進流水濃度高且MSL去除率不佳，僅於春季時，在進流原水TOC濃度低於10 mg/L且HLR低於1000 L/m2/d的條件下，出流水TOC濃度可符合飲用水水源水質標準，顯見HLR及水溫為影響TOC去除率的重要因子，由SCI模型結果亦得MSL對TOC的去除主要由水溫、HLR、進流水TOC控制。
由PARAFAC分析結果可得，進流原水包含三個主要NOM成分，分別為類黃酸物質、類腐植酸物質與類蛋白物質。進流原水所含類蛋白物質比例由第一試程的20%逐步增加至第五試程的37%，表示水中約60–80%的有機物難以為生物分解，為BioNet對TOC去除率不佳的可能原因。由AFI及PARAFAC分析結果可得，經MSL處理後NOM成分比例變化有限，夏、秋季MSL對生物易分解之NOM去除率較佳，推測因水溫較高，生物活性佳。冬、春季MSL對生物易分解及不易分解之NOM去除率相當，除了第五試程因生物易分解之NOM比例較高，故生物分解比例高。冬季MSL對各NOM成分去除率相當，且在相同操作條件下皆低於其它試程，故推測水溫低除了會降低生物分解效果，亦會使類黃酸及類腐植酸等疏水性NOM吸附效果不佳，由此可知，水溫為影響TOC去除率的重要因素。此外，由NOM成分分析結果推測生物在好氧條件下將類蛋白物質分解為CO2，因進流水pH較高，CO2較易溶入水中，故使得MSL出流水pH下降。

Outlying reservoirs have high degree of eutrophication. The total organic carbon (TOC) of the water can hardly meet the water quality standard of drinking water source. The TOC concentration of Chenggong Reservoir in summer and autumn (wet season) is between 6-10 mg/L, and winter and spring (dry season) is between 9-14 mg/L. Multi-Soil-Layering (MSL) is an improved method of soil infiltration originated from Japan. MSL wraps the composite filter materials such as soil, iron, charcoal and organics in a brick-like bag called Soil Mixture Bricks(SMB) to strengthen soil function, and then use the brick-like layer pattern with soil mixture layer and permeable layer composed of zeolite or gravel to improve the clogging and short-circuit. a MSL system(pilot scale) with a maximum treating capacity of 40 CMD and four treatment tanks which are operated independently and have SMBs that consist of different ratio of filter materials is set up aside Chenggong Reservoir. The influent water is taken from the reservoir, and then pumped into the MSL unit after pretreating by BioNet. This study fully evaluates the effect of MSL on TOC removal under dynamic change of water quality by the advantage of pilot study. Additionally, Stepwise Cluster Analysis is used to establish a model of the relationship between continual variables such as water quality parameters of raw water, environmental factors, and TOC removal rate by MSL. Combine Fluorescence Excitation Emission Matrix, Average Fluorescence Intensity and Parallel Factor Analysis method to analyze the composition of NOM in raw water and its change in the purification process(BioNet+MSL) and discuss the removal mechanism of NOM.

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