Scale-up of electrokinetic permeable reactive barriers for the removal of organochlorine herbicide from spiked soils

JOURNAL OF HAZARDOUS MATERIALS

卷:417

Article

Maldonado, S.¹  Lopez-Vizcaino, R.²  Rodrigo, M. A.³  Canizares, P.³  Navarro, V²  Roa, G.¹  Barrera, C.¹  Saez, C.³ 

[1] Autonomous Univ State Mexico, Coll Chem, Dept Environm Chem, Toluca De Lerdo 50120, Mexico

[2] Univ Castilla La Mancha, Geoenvironm Grp, Avda Camilo Jose Cela S-N, Ciudad Real 13071, Spain

[3] Univ Castilla La Mancha, Coll Chem Sci & Technol, Dept Chem Engn, Campus Univ S-N, Ciudad Real 13071, Spain

关键词: Electro-remediation;    Soil remediation;    Clopyralid;    Granular activated carbon;    Zero valent iron;    Permeable reactive barrier;   

DOI  :  10.1016/j.jhazmat.2021.126078

来源: Elsevier

【 摘 要 】

This work aims to shed light on the scale-up a combined electrokinetic soil flushing process (EKSF) with permeable reactive barriers (PRB) for the treatment of soil spiked with clopyralid. To do this, remediation tests at lab (3.45 L), bench (175 L) and pilot (1400 L) scales have been carried out. The PRB selected was made of soil merged with particles of zero valent iron (ZVI) and granular activated carbon (GAC). Results show that PRB-EKSF involved electrokinetic transport and dehalogenation as the main mechanisms, while adsorption on GAC was not as relevant as initially expected. Clopyralid was not detected in the electrolyte wells and only in the pilot scale, significant amounts of clopyralid remained in the soil after 600 h of operation. Picolinic acid was the main dehalogenated product detected in the soil after treatment and mobilized by electro-osmosis, mostly to the cathodic well. The transport of volatile compounds into the atmosphere was promoted at pilot scale because of the larger soil surface exposed to the atmosphere and the electrical heating caused by ohmic losses and the larger interelectrode gap.

【 授权许可】

Free