TY - JOUR

T1 - Electrodialytic remediation of suspended soil – Comparison of two different soil fractions

A1 - Sun,Tian Ran

A1 - Ottosen,Lisbeth M.

A1 - Jensen,Pernille Erland

A1 - Kirkelund,Gunvor Marie

AU - Sun,Tian Ran

AU - Ottosen,Lisbeth M.

AU - Jensen,Pernille Erland

AU - Kirkelund,Gunvor Marie

PB - Elsevier BV

PY - 2012

Y1 - 2012

N2 - Electrodialytic remediation (EDR) can be used for removal of heavy metals from suspended soil, which allows for the soil remediation to be a continuous process. The present paper focused on the processing parameters for remediation of a soil polluted with Cu and As from wood preservation. Six electrodialytic treatments lasting from 5 to 22 days with different liquid to solid ratio (L/S) and current intensity were conducted. Among treatments, the highest removal was obtained from the soil fines with 5mA current at L/S 3.5 after 22 days where 96% of Cu and 64% of As were removed. Comparing the removal from the original soil and the soil fines in experiments with identical charge transportation, higher removal efficiency was observed from the soil fines. Constant current with 5mA could be maintained at L/S 3.5 for the soil fines while not for the original soil. Doubling current to 10mA could not be maintained for the soil fines either, and doubling L/S to 7 at 5mA entailed a very fast acidification which impeded the removal. The results showed that a very delicate balancing of current density and L/S must be maintained to obtain the most efficient removal.

AB - Electrodialytic remediation (EDR) can be used for removal of heavy metals from suspended soil, which allows for the soil remediation to be a continuous process. The present paper focused on the processing parameters for remediation of a soil polluted with Cu and As from wood preservation. Six electrodialytic treatments lasting from 5 to 22 days with different liquid to solid ratio (L/S) and current intensity were conducted. Among treatments, the highest removal was obtained from the soil fines with 5mA current at L/S 3.5 after 22 days where 96% of Cu and 64% of As were removed. Comparing the removal from the original soil and the soil fines in experiments with identical charge transportation, higher removal efficiency was observed from the soil fines. Constant current with 5mA could be maintained at L/S 3.5 for the soil fines while not for the original soil. Doubling current to 10mA could not be maintained for the soil fines either, and doubling L/S to 7 at 5mA entailed a very fast acidification which impeded the removal. The results showed that a very delicate balancing of current density and L/S must be maintained to obtain the most efficient removal.

KW - Soil remediation

KW - Original soil

KW - Heavy metals

KW - Soil fines

KW - Electrodialysis

U2 - 10.1016/j.jhazmat.2011.12.006

DO - 10.1016/j.jhazmat.2011.12.006

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

VL - 203-204

SP - 229

EP - 235

ER -