本文關(guān)鍵詞：表面活性劑強(qiáng)化曝氣修復(fù)MTBE污染飽和砂土室內(nèi)試驗(yàn)研究　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地下水曝氣 飽和砂土 表面活性劑 模型試驗(yàn) 氣相運(yùn)動(dòng)規(guī)律 揮發(fā)性有機(jī)物 多相流模型 SDBS MTBE

【摘要】：地下水原位曝氣是一種經(jīng)濟(jì)、有效的飽和帶揮發(fā)性有機(jī)物污染修復(fù)技術(shù),但常規(guī)曝氣條件下受污染物特性及場(chǎng)地地質(zhì)條件限制,導(dǎo)致曝氣影響范圍小、污染物去除效果不佳。因此,開(kāi)展實(shí)用有效的強(qiáng)化曝氣修復(fù)方法機(jī)理與效果研究具有重要的科學(xué)和工程意義。本文以國(guó)家自然科學(xué)基金項(xiàng)目(41330641,41272311)為依托,針對(duì)揮發(fā)性有機(jī)物甲基叔丁基醚(MTBE)污染飽和砂土,基于地下水曝氣修復(fù)物理化學(xué)機(jī)制及一維與二維模型試驗(yàn),對(duì)十二烷基苯磺酸鈉(SDBS)表面活性劑強(qiáng)化曝氣修復(fù)機(jī)理、氣相運(yùn)動(dòng)規(guī)律與修復(fù)效果進(jìn)行了系統(tǒng)的研究。取得了以下主要研究成果：1) 通過(guò)表面活性劑強(qiáng)化曝氣修復(fù)的物理化學(xué)機(jī)理試驗(yàn),研究了地下水pH值及鹽度對(duì)SDBS溶液表面張力影響以及SDBS對(duì)MTBE的增溶與解吸附作用規(guī)律。結(jié)果表明,當(dāng)SDBS濃度低于臨界膠束濃度時(shí),表面張力隨溶液pH值增大略有升高;在較低鹽度時(shí)(小于15‰),SDBS溶液的表面張力隨鹽度增大明顯減��；SDBS濃度較低時(shí),對(duì)于有機(jī)污染物MTBE的增溶和解吸附作用都不明顯,當(dāng)SDBS濃度分別達(dá)到200 mg/L和500 mg/L后其增溶和解吸附特性才開(kāi)始發(fā)揮作用。2) 通過(guò)一維與二維室內(nèi)模型試驗(yàn),對(duì)表面活性劑強(qiáng)化地下水曝氣過(guò)程氣相運(yùn)動(dòng)規(guī)律包括壓力流量關(guān)系、氣相飽和度、氣流形態(tài)、影響半徑、通道數(shù)目等進(jìn)行了系統(tǒng)研究。結(jié)果表明,表面活性劑的引入降低了最小曝氣壓力；相同曝氣壓力下泡沫化表面活性劑曝氣流量較常規(guī)曝氣和表面活性劑預(yù)飽和曝氣��；表面活性劑的引入能顯著增大曝氣過(guò)程中的氣相飽和度和影響半徑,氣流通道數(shù)量也有一定程度增加,并且以上強(qiáng)化效果粗顆粒砂土(2.0-4.0mm)優(yōu)于細(xì)顆粒砂土(0.5-1.0mm)；表面活性劑引入對(duì)氣流形態(tài)基本沒(méi)有影響,但2.0-4.0 mm砂土中氣泡的尺寸有所減小,且出現(xiàn)較多微型氣泡；表面活性劑溶液預(yù)飽和方式氣相運(yùn)動(dòng)規(guī)律較泡沫化表面活性劑方式好,但后者更適于現(xiàn)場(chǎng)應(yīng)用。3) 通過(guò)表面活性劑SDBS強(qiáng)化曝氣修復(fù)MTBE污染飽和砂土室內(nèi)模型試驗(yàn),研究了污染物的去除規(guī)律與效果。結(jié)果表明,一維和二維模型試驗(yàn)條件下,泡沫化表面活性劑曝氣較常規(guī)曝氣對(duì)污染物的去除速率均有明顯提高;表面活性劑強(qiáng)化修復(fù)效果粗顆粒砂土(2.0-4.0 mm)優(yōu)于細(xì)顆粒砂土(0.5-1.0 mm)；一維模型試驗(yàn)條件下,無(wú)論何種曝氣方式模型柱從底部到頂部各點(diǎn)的集總參數(shù)KLa均逐漸減小,泡沫化SDBS曝氣情況下相同位置表面活性劑影響區(qū)KLa值高于常規(guī)曝氣法；在二維模型試驗(yàn)條件下,由于單井曝氣影響范圍有限以及空氣注入對(duì)地下水的擾動(dòng)作用,可引起MTBE污染物向周圍未污染區(qū)的擴(kuò)散。4) 基于多相流理論,考慮表面活性劑強(qiáng)化作用,利用TOUGH2軟件對(duì)污染物苯的泄漏遷移與地下水污染曝氣修復(fù)過(guò)程進(jìn)行了數(shù)值模擬。研究表明,表面張力的減小將增大曝氣影響半徑、氣相飽和度及污染物去除速率,使得污染物苯的去除率得到顯著提高。
[Abstract]:In situ groundwater aeration is a kind of economy, saturated with volatile organic compounds pollution remediation technology, but the conventional aeration conditions restricted pollutant characteristics and geological conditions of the site, resulting in aeration influence area, the pollutant removal effect. Therefore, it has important scientific and engineering significance to research the mechanism and effect of strengthening the practical and effective method to repair the aeration in this paper the project of National Natural Science Fund (4133064141272311) as the basis, the volatile organic compounds of methyl tert butyl ether (MTBE) contamination of saturated sand, groundwater aeration repair the physical and chemical mechanism and 1D and 2D model test based on twelve sodium dodecyl benzene sulfonate (SDBS) surfactant enhanced air sparging mechanism, gas motion and the repair effect was studied. The main results are as follows: 1) by surfactant enhanced air sparging Test the physical and chemical mechanism, study the adsorption law of groundwater pH value and salinity on surface tension of SDBS solution and SDBS MTBE on the solubilization and solution. The results show that when the SDBS concentration is lower than the critical micelle concentration, surface tension with the pH value of the solution increased slightly increased; in the low salinity (less than 15 per thousand) the surface tension of SDBS solution, with the increase of salinity decreases; when the SDBS concentration is relatively low, is not obvious for the solubilization of organic pollutants MTBE settlement adsorption, when the concentration of SDBS was 200 mg/L and 500 mg/L after the solubilization and desorption properties began to play a role in.2) by 1D and 2D model test, movement the law of groundwater aeration process including gas pressure flow relationship enhancement of surfactant, gas saturation, airflow pattern, radius of influence, the number of channels were studied. The results show that the surface active agent The introduction of reduced minimum aeration pressure; pressure activated aeration bubbles of the same surfactant aeration volume than conventional aeration and surfactant saturated aeration; introducing surfactant can significantly increase the aeration process in gas phase saturation and radius of influence, the number of flow channel also increased to some degree, and the above strengthening effect coarse sand (2.0-4.0mm) is better than that of fine sand (0.5-1.0mm); the introduction of surfactant has no effect on the air bubbles form, but 2.0-4.0 mm in sand size decreased, and the more micro bubble; surfactant solution saturated vapor movement is active mode of bubble surface agent mode, but the latter more suitable for field application of.3) by surfactant SDBS aeration MTBE contaminated sand model test, studied the pollutant removal efficiency and the law Results. The results show that a two-dimensional model under the experimental conditions, the activity of bubble surface aeration agent than conventional aeration on pollutant removal rate were significantly improved; surfactant enhanced remediation effect of coarse sand (2.0-4.0 mm) is better than that of fine sand (0.5-1.0 mm); test condition of one-dimensional model, no matter what kind of aeration model column from the bottom to the top of the lumped parameter KLa are reduced gradually. The effect of SDBS foam under the same aeration position of surfactant KLa value is higher than that of the conventional aeration method; in the 2D model under the experimental conditions, due to the limited scope of the single well aeration and air injection on groundwater disturbance, pollutants can cause MTBE to spread around.4 not polluted area) based on the multiphase flow theory, considering the effect of surfactant enhanced migration and underground water pollution, leakage of pollutants benzene exposure by using TOUGH2 software Numerical simulation of gas recovery process shows that decreasing the surface tension will increase the influence radius of aeration, gas phase saturation and pollutant removal rate, and increase the removal rate of benzene.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU441

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