Study on remediation of chromium contaminated soil by an improved electrokinetic extraction device with auxiliary liquid chamber
2024; Elsevier BV; Volume: 482; Linguagem: Inglês
10.1016/j.cej.2024.148814
ISSN1873-3212
AutoresJunnian Wu, Zihuang Lin, Changze Wang, Yupeng Fu, Jiang Li, Yinliu Li, Chang Chen,
Tópico(s)Geophysical and Geoelectrical Methods
ResumoThe focusing effect and total chromium removal of electrokinetic remediation of chromium-contaminated soil are always difficult problems. An electrokinetic extraction system improved with an auxiliary liquid chamber (ALC) located in the middle part of the soil chamber is designed. The results show that the ALC can regulate the soil pH and collect Cr. Compared with electrokinetic extraction without the ALC, the average current of the system may be increased by 5.12 %, the soil conductivity may be increased by 27.12 %, and the total Cr collection amount may be increased by 3.45 %, while with different soil buffering capacity. When combined with oxalate-potassium oxalate solution in the ALC, the total chromium removal efficiency of 54.63 % can be achieved. Additionally, the combination of the exchangeable electrode and the ALC can alleviate the focusing effect of chromium accumulation in the middle of the soil chamber. The amount of chromium collected in the ALC (78.25 mg/kg to 93.11 mg/kg) and it in the cathode chamber (69.58 mg/kg to 188.21 mg/kg) are increased when ALC coupled with electrode exchange, the ALC with potassium permanganate may significantly improve the removal efficiency of total chromium (70.06 %) and Cr(III) (75.38 %). The system with ALC is new feasible technical route of promoting application prospects.
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