研究报告
何宝南,何江涛,王菲,连玉倩.纳米乳化油缓解多孔介质渗透性损失的实验研究[J].环境科学学报,2018,38(1):267-274
纳米乳化油缓解多孔介质渗透性损失的实验研究
- Nano emulsified oil alleviating the permeability loss in porous media
- 基金项目：中央高校基本科研业务专项（No.35732015189）
- 作者
- 单位
- 何宝南
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 何江涛
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 王菲
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 连玉倩
- 中国地质大学(北京)水资源与环境工程北京市重点实验室, 北京 100083
- 摘要：为有效缓解乳化油在原位修复地下水污染过程中所产生的堵塞及修复效率降低的问题，采用升温相转变技术手段，制备纳米乳化油.并采用一维柱实验，开展微米及纳米乳化油在多孔介质中的迁移研究，对比分析微米及纳米乳化油造成多孔介质的渗透性损失、在多孔介质中的截留比率及迁移距离等问题，探究纳米乳化油缓解多孔介质渗透性损失的效果.实验结果显示，微米及纳米乳化油所导致的中砂介质渗透性损失分别为20.40%和3.20%，乳化油截留比率分别为28.51%和20.15%.由此可见，乳化油截留是多孔介质渗透性损失的重要原因，减小乳化油粒径可有效缓解多孔介质的渗透性损失.与微米乳化油相比，纳米乳化油有效降低中、细砂介质渗透性损失84.3%和47.5%.此外，乳化油截留对多孔介质渗透性损失的影响在一定程度上也影响到其在多孔介质中的迁移距离，微米及纳米乳化油在中砂介质中的迁移距离分别为6.53 m和8.19 m.相比之下，纳米乳化油所导致的细砂介质渗透性损失为10.70%，截留比率为25.71%，迁移距离为7.36 m，说明纳米乳化油迁移效果更佳，可适用介质范围更广.
- Abstract：To effectively solve the problem of clogging and the decrease of remediation efficiency in the process of emulsified oil in situ remediation groundwater pollution. Heating phase transformation technology was used for the preparation of nano emulsified oil. One-dimensional column experiment was carried out to study micro and nano emulsified oil migration in porous media, analyze the problem of porous media permeability loss, intercept ratio and migration distance. And explore the effect of nano emulsified oil on the relief of permeability loss of porous media. Results show that medium sand permeability loss caused by micro and nano emulsified oil were 20.40% and 3.20%, respectively. Emulsified oil intercept ratio were 28.51% and 20.15%, respectively. Obviously, emulsified oil entrapment is one of the important reasons for porous media permeability loss.Reducing particle size can effectively alleviate porous media permeability loss. Compared with micro emulsified oil, nano emulsified oil effectively easing medium and fine sand permeability loss were 84.3% and 47.5%, respectively. Besides, permeability loss caused by emulsified oil entrapment on porous media can also affect its migration distance in porous media. Micro and nano emulsified oil migration distance were 6.53 m and 8.19 m in medium sand, respectively. Nano emulsified oil caused fine sand permeability loss 10.70%, intercept ratio 25.71%, and 7.36 m migration distance, which means nano emulsified oil had better migration ability and wide application range.
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