氨水循环增强电动力学技术去除土壤中的氟

为了探讨氨水增强电动力学技术修复氟污染土壤的效果及对土壤pH值的影响,在自制的电动力学装置中,1 V/cm电解电压下,以氨水作电解液,采用连续循环的方式进行研究。结果显示,氨水连续循环不仅增大了修复过程中的电流值,且使通过土壤的电流更加稳定,在提高土壤氟迁移效率的同时降低了能耗。在设定的浓度中(0、0.01、0.1和0.2 mol/L),土壤氟的去除率随着氨水浓度的升高而增加,0.2 mol/L氨水具有最大电流值26.8 mA,土壤氟的去除率也达到57.9%,氨水循环增强时两极土壤pH值差异减小。采用氨水循环增强电动力学技术,可有效修复氟污染土壤,土壤中剩余氨还可以提高土壤肥力。

Removing fluorine in soil by using ammonia circulation enhanced electrokinetics

In an attempt to explore the remediation of fluorine polluted soil and the effects on soil pH of ammonia circulation enhanced electrokinetics, an experimental study was carried out in the self-made apparatus. The voltage gradient was set at 1 V/cm and ammonia water was used as electrolyte which circulated in series. The results showed that the continuous circulation of ammonia water not only increased the current in the process of remediation, but made the current through the soil cell more stable, which reduced the energy consumption while improving the fluorine migration. Among the tested ammonia concentrations (0, 0.01, 0.1 and 0.2 mol/L), the removal rate increased with the concentration, and 0.2 mol/L had the highest current (26.8 mA) and the removal rate of fluorine reached 57.9%. With the enhancement of ammonia circulation, the difference between pH values of cathode and anode soil reduced. Ammonia circulation enhanced electrokinetics can effectively remediate the fluorine polluted soil and the residual ammonia in the soil can also improve soil fertility.