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標題: 緩釋過硫酸鈉蠟燭之製備及其釋放行為探討
Preparation of Sustained-Release Sodium Persulfate Candle and Evaluation of Its Releasing Behavior
作者: 陳正于
Chen, Cheng-Yu
關鍵字: 緩釋系統
Sustained release system
Sodium persulfate
Soil and groundwater remediation
In situ chemical oxidation
出版社: 環境工程學系所
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摘要: 現地化學氧化法係藉由將氧化劑注入地下含水層之方式,以處理土壤及地下水污染,然而受到含水層地質異質性之影響,注入之氧化劑溶液傳輸至土壤滲透性較低之區域時(細質地土壤,例如:坋土(Silt)),傳統注入氧化劑之方式會造成氧化劑傳輸上的限制,使氧化劑無法有效接觸污染物。因此,緩釋技術之應用藉由緩慢釋放氧化劑之方式,使氧化劑擁有足夠的時間,緩慢且均勻滲透入細質地土壤中,可達到有效之現地化學氧化處理。本研究嘗試製備緩釋過硫酸鈉(Sodium persulfate, SPS)蠟燭(SPS candle),並探討SPS candle之釋放特性(批次、管柱及砂箱試驗)以及結合釋放模式之模擬,用以推估SPS candle於土壤及地下水整治之應用。 實驗選用基質擴散系統(Matrix diffusion controlled system)利用乾式熱熔包覆法將石蠟(Paraffin wax)與過硫酸鈉粉末均勻混合,製備成緩釋過硫酸鈉蠟燭,過硫酸鈉與石蠟之重量比6/1為最適比例,具有較佳之分散性與穩定度。石蠟與過硫酸鈉交互反應試驗中,高濃度(100 g/L)及低濃度(1 g/L) SPS之試驗組及控制組中,過硫酸鈉濃度變化幅度皆在5%以內,無顯著之吸附或是氧化劑自身降解之反應發生,可知SPS並不會與石蠟產生反應。批次與砂箱釋放試驗結果顯示,於釋放後之過硫酸鈉因密度較水為大,SPS於水體中之分佈向下沉降,呈現水平分層之現象,額外注入氣泡擾動則可打破過硫酸鈉濃度分層之現象。批次釋放試驗模式推估可知Sinclair and Peppas方程式具有較佳之相符趨勢。管柱釋放試驗中,結合擴散傳輸釋放模式計算,求得SPS於石蠟中平均有效擴散係數值介於2x10-6到3x10-6 cm2/s之間,以此範圍可推估不同半徑之SPS candle其SPS最少釋放天數。當另外使用不同尺寸之緩釋過硫酸鈉蠟燭推估實際釋放情形,結果顯示其釋放天數符合模式的推估釋放時間範圍。
In situ chemical oxidation (ISCO) is a subsurface remediation technique which can be operated by injecting chemical oxidant into the aquifer and treating soil and groundwater contamination in situ. However, the geological heterogeneity of aquifer (e.g., finer textured soils (silt formation)) may hinder transport of oxidant injected by conventional liquid injection method. Therefore, sustained-release of oxidant may allow oxidant be able to efficiently transport within low permeable soils. The objectives of this study was set to prepare sustained-release sodium persulfate candle (SPS candle), investigate its releasing behavior in batch, column and sand tank experiments and develop releasing models. In accordance with the matrix diffusion controlled system, the SPS candle was successfully prepared by heating and mixing SPS and paraffin wax with an optimum mass ratio of 6/1. The results of oxidant and paraffin wax interaction experiments showed that either high or low persulfate concentration (100 g/L and 1 g/L) and control tests with less than 5% losses of SPS exhibited no absorption or interaction between SPS and wax. SPS candle releases in batch and sand tank experiments indicated that the SPS concentration was higher at the bottom of the solution due to a higher density of SPS solution than water. However, this uneven SPS distribution phenomenon can be overcome by aeration. Batch SPS candle releasing behavior can be well simulated by Sinclair and Peppas empirical equation. In order to estimate the SPS candle minimum releasing time, the diffusion-transport releasing model was developed and the matrix effective diffusion coefficient (De) was then determined. Mean De values obtained based on the data of column releasing experiments ranged from 2x10-6 to 3x10-6 cm2/s. An additional SPS candle releasing experiment with a larger diameter of SPS candle was conducted and the releasing time fit well with the developed model for determining its minimum releasing time.
其他識別: U0005-2506201316115000
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