A laboratory feasibility study on a new electrokinetic nutrient injection pattern and bioremediation of phenanthrene in a clayey soil

作者：Xu Wei; Wang Cuiping; Liu Haibin; Zhang Zhiyuan; Sun Hongwen^*

来源：Journal of Hazardous Materials, 2010, 184(1-3): 798-804.

DOI：10.1016/j.jhazmat.2010.08.111

• Bioremediation
• Electrokinetic
• Ion injection
• Nutrients
• Phenanthrene

Electrokinetic (EK) injection has recently been proposed to supply nutrients and electron acceptors in bioremediation of low permeable soils. However, effective pH control and uniform injection of inorganic ions have yet to be developed. The present study investigated a new EK injection pattern, which combined electrolyte circulation and electrode polarity reversal on a clayey soil. Soil pH could be controlled ranging from 7.0 to 7.6 by circulating the mixed electrolyte at a suitable rate (800 mL/h in this study) without any buffer. Ammonium and nitrate ions were distributed more uniformly in soil by electrode polarity reversal. The developed electrokinetic injection technology was applied primarily in bioremediation of phenanthrene contaminated soil. Over 80% of the initial 200 mg/kg phenanthrene in soil could be removed in 20d. and greater phenanthrene removal was achieved using electrode polarity reversal. Hence, the present study provides a promising electrokinetic injection technology for bioremediation of contaminated soils.

• 出版日期2010-12-15
• 单位南开大学