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題名 | 臺中市垃圾掩埋場滲出水傳輸研究 |
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作者 | 陳鴻烈; 鄭慧玲; | 書刊名 | 農林學報 |
卷期 | 44:3 1995.09[民84.09] |
頁次 | 頁17-28 |
分類號 | 445.2596 |
關鍵詞 | 滲出水污染柱; 有機物傳輸模式; 參數鑑定; Leachate plume; Organic matters transport model; Parameter identification; |
語文 | 中文(Chinese) |
中文摘要 | 台中市近郊山坡地之衛生掩埋場下游觀測井,發現已遭到垃圾滲出水之 污染,故本研究欲以模式來探討受污染地下水中有機物(以COD為指標)在飽和含 水層(saturated aquifer)中傳輸之特性,以作為將來管理及污染防治時之有效輔助 工具。研究並將進行延散度(dispersivity)、遲滯係數(retardation)及衰減係數(dacay coefficient)等參數鑑定工作。研究使用有限元素法(finite element method)數值傳輸 模式進行傳輸模擬。模式傳輸的機制包括平流(convection)、延散(dispersion)、遲 滯(retardation)及衰減(decay)等四個機制。經以模擬現地條件來進行批次及連續式 土柱室內實驗。結果顯示氯鹽及氯化汞可分別作為延散度與遲滯係數的參數鑑定 工具;此外,發見土壤吸附有機物的平衡時間甚快,平衡吸附模式較接近非線性 吸附模式。由實驗並求出土柱之延散度介於1.17~0.35公分,遲滯係數平均值為2.05, 化生需氧量的半衰期在46天左右。研究亦顯示SEFTRAN模式可適用於垃圾滲流 水中有機物之傳輸模擬.而未經參數鑑定之模擬結果,可能只是參數組合之巧 合,並不具實際意義。在敏感度分析中則發現本實驗達西流速(darcy's velocity)是 一個最敏感的參數。 |
英文摘要 | There are many organic pollutants in the monitoring well at TAICHUNG's sanitary landfills. This objects of this study were to understand the leachate transpart phenomena in thesaturated ground water and to apply a proper transport mathematical model to be an effectiveaid for the underground pollution management and contaminant control in this specific site.This study simulates the mathematical transport model of organic matters of leachate plume insaturated aquifer by SEFTRAN. The model uses the Garlerkin's finite element method and itsmechanism includes convection, dispersion, retardation and decay. Consequently this study investigates not only on the parameters of convection but also on the parameters of dispersivity, retardation, and decay. In the laboratory, we did several significant pre-tests and filter selectionsto standardize the testing process. The results show chloride is a nice tracer and mecuric chloride is an excellent inhibitor for decay study in this case. The equilibrium time of soil organicmatter's adsorption is less than 12 hours. The half life of chemical oxygen damand formethane phase leachate is 46 days. In lysimeters, the experiments simulates the field conditionssuch as soil characteristics, groundwater temperature etc. The results show as follow: the meanof retardation coefficient is 2.05. The dispersivity of column is between 0.17cm to 0.35cm. Inaddition to the sensitivity study, the parameter comparsion is made to show Darcy's velocity isthe most senstive parameter. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。