Removal of oxyfluorfen from ex-situ soil washing fluids using electrolysis with diamond anodes

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:171

Article

dos Santos, Elisama Vieira¹  Saez, Cristina²  Martinez-Huitle, Carlos Alberto¹  Canizares, Pablo²  Andres Rodrigo, Manuel² 

[1] Univ Fed Rio Grande do Norte, Inst Chem, BR-59078970 Natal, RN, Brazil

[2] Univ Castilla La Mancha, Dept Chem Engn, Enrique Costa Bldg,Campus Univ S-N, E-13071 Ciudad Real, Spain

关键词: Oxyfluorfen;    Electrolysis;    Soil remediation;    Soil washing;    Boron doped diamond;   

DOI  :  10.1016/j.jenvman.2016.01.027

来源: Elsevier

【 摘 要 】

In this research, firstly, the treatment of soil spiked with oxyfluorfen was studied using a surfactant-aided soil-washing (SASW) process. After that, the electrochemical treatment of the washing liquid using boron doped diamond (BDD) anodes was performed. Results clearly demonstrate that SASW is a very efficient approach in the treatment of soil, removing the pesticide completely by using dosages below 5 g of sodium dodecyl sulfate (SDS) per Kg of soil. After that, complete mineralization of organic matter (oxyflourfen, SDS and by-products) was attained (100% of total organic carbon and chemical oxygen demand removals) when the washing liquids were electrolyzed using BDD anodes, but the removal rate depends on the size of the particles in solution. Electrolysis of soil washing fluids occurs via the reduction in size of micelles until their complete depletion. Lower concentrations of intermediates are produced (sulfate, chlorine, 4-(trifluoromethyl)-phenol and ortho-nitrophenol) during BDD-electrolyzes. Finally, it is important to indicate that, sulfate (coming from SDS) and chlorine (coming from oxyfluorfen) ions play an important role during the electrochemical organic matter removal. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free