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By adjusting the pH value of electrokinetic remediation cathode and adding enhancers, the total removal rate of Cr from the contaminated soil by electrokinetic remediation technology was increased. Then, the change of energy consumption and law of Cr migration and distribution during the electrokinetic remediation project were explored. The results show that EDTA, citric acid and hydrochloric acid can significantly enhance the total Cr removal rate during the electrokinetic remediation process. The total removal rates of Cr were 24.47% and 23.24% respectively after 7 days of electrokinetic remediation without adjusting the pH value of the cathode, by adding EDTA and citric acid into the soil. The pH value of the cathode isn't adjusted, which results in an obvious polarization effect. In contrast, the total removal rates of Cr were 44.20% (4.9 times as much as the blank) and 36.80%, respectively, after 7 days of electrokinetic remediation with the pH value of the cathode controlled, by adding hydrochloric acid and citric acid to the soil, respectively. Controlling the pH value of the cathode can effectively prevent the precipitation of Cr in the cathode region, thus enhancing the removal rate of Cr, but won't significantly increase the energy consumption of the electrokinetic remediation process. This method can greatly increase the total removal rate of Cr in contaminated soil by electrokinetic remediation, which is of significance in guiding the remediation of heavy metal contaminated soil.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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