重非水相液体与水相界面面积的二维实验研究
发布时间：2018-10-12 12:12
【摘要】：多孔介质中重非水相液体(Dense Non-Aqueous Phase Liquid,DNAPL)与水相的界面面积是影响DNAPL在地下水中溶解速率的关键参数。本文通过二维均质砂箱实验,运用界面分配示踪法和体积分配示踪法分别测定DNAPL与水相的界面面积(单位介质体积内的面积,Anw)和DNAPL饱和度(Sn),并研究两者之间的相关关系。使用C_(18)H_(29)NaO_3S(SDBS)作为界面分配示踪剂,Alcohol(2,4-Dimethyl-3-Pentanol)作为体积分配示踪剂,CaBr_2作为保守示踪剂。利用Fe2+催化的Na_2S_2O_8对DNAPL进行原位氧化修复,改变Anw和Sn。结果表明,通过定量(用孔隙体积数PV值衡量)加入Na_2S_2O_8,Anw由206cm~2逐渐降为37cm~2,下降速率约为14cm~2/PV;Sn由1.34%逐渐降为0.33%,下降速率约为0.1%/PV;Anw和Sn之间具有良好的线性关系(Anw=146×Sn,R2=0.987)。此关系可用于估算多孔介质中DNAPL与水相之间的界面面积。对实验影响因素的分析表明,孔隙度的增大(变化率为20.7%)使示踪剂穿透曲线出现肩现象和拖尾现象,导致保守示踪剂的保留时间增加5.6%,界面面积减小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%.
【作者单位】： 中国地质大学(北京)水资源与环境学院;Department
【基金】：国家自然科学基金项目(41302179,41372233)
【分类号】：X131.2
，
本文编号：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%.
【作者单位】： 中国地质大学(北京)水资源与环境学院;Department
【基金】：国家自然科学基金项目(41302179,41372233)
【分类号】：X131.2
，
本文编号：2266065
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