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首页> 外文会议>Sixth International in Situ and On-Site Bioremediation Symposium, 6th, Jun 4-7, 2001, San Diego, California >ELECTROKINETIC MOVEMENT OF BIOLOGICAL AMENDMENTS THROUGH NATURAL SOILS TO ENHANCE IN-SITU BIOREMEDIATION
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ELECTROKINETIC MOVEMENT OF BIOLOGICAL AMENDMENTS THROUGH NATURAL SOILS TO ENHANCE IN-SITU BIOREMEDIATION

机译：天然土壤中生物修正物的电动运动，以增强原位生物修复

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Electrokinetics is an in-situ electrochemical process capable of transporting ions through sand as well as low permeable soils. Ionic nutrients can be amended near each electrode and transported into the soil by ion migration and electroosmosis. This study investigated and demonstrated the feasibility of nutrient and carbon source transport in soils by electrokinetic for potential in-situ bioremediation. A series of bench scale column studies were conducted to assess the migration of acetate and nitrate amendments in a simulated in-situ environment. Electrolysis reactions at the electrodes result in changes in hydrogen and hydroxide ion concentrations. Strategies for managing shifts in pH using acid and base solutions at the cathode and anode in the subsurface were investigated. Experimental variables included two current densities, three soil types, and two amendments at varying concentrations. The hydraulic conductivity of the sand, silt, and clay were 43.2 m/day (5x10~(-2) cm/s), 8.2xl0~(-5) m/day (9.5xl0~(-8) cm/s), and 8.4xl0~(-7) m/day (1xl0~(-9) cm/s) respectively. The linear transport rates of amendments in the sand were between 60-80 m/day. The linear transport rates of amendments in the silt and clay were between 1.1-2.5 m/day and 0.9-2.5 m/day respectively. The results indicate that electrokinetic induced ion migration can be used to enhance amendment flux relative to hydraulic flow characteristics though various subsurface soils in substantial concentrations. This study demonstrated that electrokinetics has the potential to increase the availability of amendments in soil pore water and groundwater systems where traditional injection techniques have been incomplete or ineffective.
机译：电动动力学是一种原位电化学过程，能够通过沙子和低渗透性土壤传输离子。离子养分可以在每个电极附近进行修正，并通过离子迁移和电渗作用而运入土壤。这项研究调查并证明了通过电动进行土壤中养分和碳源运输的潜在原位生物修复的可行性。进行了一系列台式规模的柱研究，以评估模拟的原位环境中乙酸盐和硝酸盐改性剂的迁移。电极上的电解反应导致氢和氢氧根离子浓度的变化。研究了在地下阴极和阳极使用酸和碱溶液管理pH值变化的策略。实验变量包括两种电流密度，三种土壤类型和两种浓度不同的改良剂。沙，淤泥和粘土的水力传导率为43.2 m / day（5x10〜（-2）cm / s），8.2xl0〜（-5）m / day（9.5xl0〜（-8）cm / s） ，分别为8.4xl0〜（-7）m / day（1xl0〜（-9）cm / s）。砂中修正剂的线性传输速率为60-80 m / day。淤泥和黏土中改性剂的线性传输速率分别在1.1-2.5 m / day和0.9-2.5 m / day之间。结果表明，电动势引起的离子迁移可用于通过大量浓度的地下土壤来提高相对于水力流动特性的修正通量。这项研究表明，电动势有可能增加土壤孔隙水和地下水系统中改良剂的利用率，而传统的注入技术还不完善或无效。

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