重非水相液體與水相界面面積的二維實驗研究
發(fā)布時間：2018-10-12 12:12
【摘要】：多孔介質(zhì)中重非水相液體(Dense Non-Aqueous Phase Liquid,DNAPL)與水相的界面面積是影響DNAPL在地下水中溶解速率的關(guān)鍵參數(shù)。本文通過二維均質(zhì)砂箱實驗,運用界面分配示蹤法和體積分配示蹤法分別測定DNAPL與水相的界面面積(單位介質(zhì)體積內(nèi)的面積,Anw)和DNAPL飽和度(Sn),并研究兩者之間的相關(guān)關(guān)系。使用C_(18)H_(29)NaO_3S(SDBS)作為界面分配示蹤劑,Alcohol(2,4-Dimethyl-3-Pentanol)作為體積分配示蹤劑,CaBr_2作為保守示蹤劑。利用Fe2+催化的Na_2S_2O_8對DNAPL進行原位氧化修復(fù),改變Anw和Sn。結(jié)果表明,通過定量(用孔隙體積數(shù)PV值衡量)加入Na_2S_2O_8,Anw由206cm~2逐漸降為37cm~2,下降速率約為14cm~2/PV;Sn由1.34%逐漸降為0.33%,下降速率約為0.1%/PV;Anw和Sn之間具有良好的線性關(guān)系(Anw=146×Sn,R2=0.987)。此關(guān)系可用于估算多孔介質(zhì)中DNAPL與水相之間的界面面積。對實驗影響因素的分析表明,孔隙度的增大(變化率為20.7%)使示蹤劑穿透曲線出現(xiàn)肩現(xiàn)象和拖尾現(xiàn)象,導(dǎo)致保守示蹤劑的保留時間增加5.6%,界面面積減小6.8%。
[Abstract]:The interface area between heavy non-aqueous phase liquid (Dense Non-Aqueous Phase Liquid,DNAPL) and water phase in porous media is a key parameter affecting the dissolution rate of DNAPL in groundwater. In this paper, the interface area of DNAPL and water phase (, Anw) and DNAPL saturation (Sn), in unit volume) are measured by using interface distribution tracer method and volume distribution tracer method, respectively, and the correlation between them is studied by using two-dimensional homogeneous sand box experiment. C _ (18) H _ (29) NaO_3S (SDBS) was used as the interfacial tracer, Alcohol (_ 2N _ 4-Dimethyl-3-Pentanol as the volume distribution tracer and CaBr_2 as the conservative tracer. In situ oxidative repair of DNAPL using Na_2S_2O_8 catalyzed by Fe2 to change Anw and Sn. The results show that the quantitative addition of Na_2S_2O_8,Anw (measured by the PV value of pore volume) decreases gradually from 206cm~2 to 37cmmm2, and the decreasing rate is about 14cmm2 / PVSn from 1.34% to 0.33%, and the decreasing rate is about 0.1 / PV-Anw and Sn with a good linear relationship (Anw=146 脳 Sn,R2=0.987). This relationship can be used to estimate the interface area between DNAPL and water phase in porous media. The analysis of experimental factors shows that the increase of porosity (change rate is 20.7%) makes the tracer penetration curve appear shoulder phenomenon and tail phenomenon, leading to the retention time of conservative tracer increased by 5.6%, and the interface area decreased by 6.8%.
【作者單位】： 中國地質(zhì)大學(xué)(北京)水資源與環(huán)境學(xué)院;Department
【基金】：國家自然科學(xué)基金項目(41302179,41372233)
【分類號】：X131.2
，
本文編號：2266065
[Abstract]:The interface area between heavy non-aqueous phase liquid (Dense Non-Aqueous Phase Liquid,DNAPL) and water phase in porous media is a key parameter affecting the dissolution rate of DNAPL in groundwater. In this paper, the interface area of DNAPL and water phase (, Anw) and DNAPL saturation (Sn), in unit volume) are measured by using interface distribution tracer method and volume distribution tracer method, respectively, and the correlation between them is studied by using two-dimensional homogeneous sand box experiment. C _ (18) H _ (29) NaO_3S (SDBS) was used as the interfacial tracer, Alcohol (_ 2N _ 4-Dimethyl-3-Pentanol as the volume distribution tracer and CaBr_2 as the conservative tracer. In situ oxidative repair of DNAPL using Na_2S_2O_8 catalyzed by Fe2 to change Anw and Sn. The results show that the quantitative addition of Na_2S_2O_8,Anw (measured by the PV value of pore volume) decreases gradually from 206cm~2 to 37cmmm2, and the decreasing rate is about 14cmm2 / PVSn from 1.34% to 0.33%, and the decreasing rate is about 0.1 / PV-Anw and Sn with a good linear relationship (Anw=146 脳 Sn,R2=0.987). This relationship can be used to estimate the interface area between DNAPL and water phase in porous media. The analysis of experimental factors shows that the increase of porosity (change rate is 20.7%) makes the tracer penetration curve appear shoulder phenomenon and tail phenomenon, leading to the retention time of conservative tracer increased by 5.6%, and the interface area decreased by 6.8%.
【作者單位】： 中國地質(zhì)大學(xué)(北京)水資源與環(huán)境學(xué)院;Department
【基金】：國家自然科學(xué)基金項目(41302179,41372233)
【分類號】：X131.2
，
本文編號：2266065
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