地下水污染物在地下環境傳輸過程中常伴隨降解反應，形成原始污染物與其連續降解生成污染物共存的問題。由於各物種具有不同的傳輸與反應特性，僅降低原始污染物濃度未必能有效控制其降解生成污染物。多重滲透性反應牆可藉由設置多個反應區域，使污染物及其降解生成污染物在通過反應區域的過程中逐步受到處理與降解，因此為處理多物種地下水污染之具潛力整治技術。本研究發展考慮平衡與非平衡吸附之多重滲透性反應牆系統多物種污染物傳輸解析解模式，並以含氯溶劑之連續降解途徑進行模式驗證與效能評估。 進一步應用所發展之解析解模式，探討在平衡吸附及不同動力學吸附條件下降解速率常數與分配係數如何影響多物種污染物傳輸行為，並評估第二道反應牆厚度與氯乙烯降解能力對整治效能之影響。結果顯示，較高的降解速率通常可降低下游污染物濃度；在平衡吸附條件下，較大的分配係數可增強污染物遲滯效應。然而，在非平衡吸附條件下，分配係數所能發揮的影響取決於溶解相與吸附相之間的質量交換速率；當吸附速率較慢時，污染物較不易由溶解相轉移至吸附相，因此較高比例的污染物仍以溶解態存在並遷移至下游區域，且此影響於整治初期較為明顯。 在設計分析中，氯乙烯因具致癌性且最大污染物濃度限值較低，成為控制多重滲透性反應牆設計需求的關鍵物種。提高第二道反應牆反應材料所提供的氯乙烯降解能力，比提高第一道反應牆中四氯乙烯的降解能力更能有效控制下游氯乙烯濃度。在平衡吸附條件下，當第二道反應牆對氯乙烯的降解能力提高為2倍及4倍時，所需厚度可分別降低約24%與40%，可望減少反應材料用量及相關施工成本。在非平衡吸附條件下，較慢的質量交換速率會增加第二道反應牆所需厚度，顯示現地吸附動力特性亦應納入反應牆系統設計考量。;Groundwater contaminants often undergo degradation during subsurface transport， producing multiple daughter products with different transport and reaction behaviors. This multispecies condition complicates remediation because controlling the parent compound alone may not adequately address its degradation products. Multi-permeable reactive barrier systems provide a promising approach through sequential attenuation within multiple reactive zones. In this study， analytical models were developed to simulate multispecies transport under equilibrium and nonequilibrium sorption conditions. A sequential degradation pathway for chlorinated solvents was adopted for model verification and performance evaluation. The models were used to evaluate degradation rate constants and distribution coefficients under equilibrium and different kinetic sorption conditions， as well as PRB2 thickness and VC degradation capacity. Faster degradation generally reduced downstream concentrations， while larger distribution coefficients enhanced retardation under equilibrium sorption. However， this benefit depended on sufficiently rapid mass exchange between the dissolved and sorbed phases. Slow sorption maintained higher dissolved concentrations and greater downgradient migration， particularly during the earlier stages of remediation. In the design analysis， VC， a carcinogenic daughter product with a relatively low MCL， was identified as the critical species for compliance. Enhancing the VC degradation capacity of the PRB2 reactive medium was more effective than increasing PCE degradation in PRB1. Under equilibrium sorption， doubling and quadrupling the VC degradation capacity of PRB2 reduced the required thickness by approximately 24% and 40%， respectively， potentially reducing reactive-material demand and construction costs. Under nonequilibrium sorption， slower mass transfer increased the required thickness， indicating that site-specific sorption kinetics should also be considered in PRB design.
