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Removal and degradation of phenol in a saturated flow by in-situ electrokinetic remediation and Fenton-like process

机译:通过原位电动修复和类Fenton工艺去除和降解饱和流中的苯酚

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In this laboratory study, a sandy loam soil saturated with phenol solution was treated by in-situ electrokinetics-Fenton process incorporated with a permeable reactive wall of scrap iron powder (SIP). The soil was contaminated and saturated with aqueous phenol solution of 90-ll5 mg/kg in concentration. It was then placed in a soil cell. The soil cell was assembled with an anode reservoir and a cathode reservoir at its ends. A bed of SIP (l.05-32.69 g) was inserted in the soil cell at a distance of 5 cm from the anode reservoir compartment. For the test runs, 0.3/100 H_2O_2 was used as the anode reservoir fluid, whereas de-ionized water was used as the cathode reservoir fluid. An electric gradient of l V/cm was applied to enhance the saturated flow in the soil cell for a period of l0 days. Experimental results have shown that the electroosmotic (EO) flow quantity decreased as the amount of SIP increased. This phenomenon was in good agreement with the results showing the value of EO permeability increased with a decreasing amount of SIP. Results also showed that throughout the test period the cumulative, consumed mass of H_2O_2 in the anode reservoir increased as the amount of SIP decreased. On the other hand, the cumulative, increased mass of phenol in the cathode reservoir was found to increase with a decreasing amount of SIP. Meanwhile, the residual phenol concentration in the soil cell was found to decrease with a decreasing amount of SIP. When l.05 g scrap iron powder was used, an overall removal and destruction efficiency of phenol of 99.7/100 was obtained. Therefore, it is evident that an in-situ combined technology of electrokinetic remediation and Fenton-like process is capable of simulta- neously removing and degrading the phenol in a saturated flow. Science B.V. All rights reserved.
机译:在该实验室研究中,通过原位电动-芬顿法结合废铁粉(SIP)的可渗透反应性壁,处理了用酚溶液饱和的砂壤土。土壤被浓度为90-115 mg / kg的苯酚水溶液污染并饱和。然后将其放入土壤池中。将土壤池在其端部组装有阳极池和阴极池。将SIP床(1.05-32.69 g)插入土壤池中,距阳极储液室5 cm。对于测试运行,将0.3 / 100 H_2O_2用作阳极储液,而将去离子水用作阴极储液。施加l V / cm的电梯度以增强土壤池中的饱和流量持续10天。实验结果表明,电渗(EO)流量随着SIP量的增加而减少。这种现象与结果表明,随着SIP量的减少,EO渗透率值增加,这与结果非常一致。结果还表明,在整个测试期间,随着SIP数量的减少,阳极储层中H_2O_2的累积消耗质量增加。另一方面,发现随着SIP量的减少,阴极槽中苯酚的累积增加质量会增加。同时,发现土壤细胞中残留的苯酚浓度随着SIP含量的降低而降低。当使用1.05克废铁粉时,苯酚的总去除和破坏效率为99.7 / 100。因此,很明显,电动修复和类Fenton工艺的原位结合技术能够同时去除和降解饱和物流中的苯酚。 Science B.V.保留所有权利。

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