Selection of anodic material for the combined electrochemical-biological treatment of lindane polluted soil washing effluents

JOURNAL OF HAZARDOUS MATERIALS

卷:384

Article

Belen Carboneras, Maria¹  Villasenor, Jose¹  Jesus Fernandez, Francisco¹  Andres Rodrigo, Manuel²  Canizares, Pablo² 

[1] Univ Castilla La Mancha, Res Inst Chem & Environm Technol ITQUIMA, Chem Engn Dept, Ciudad Real 13071, Spain

[2] Univ Castilla La Mancha, Fac Chem Sci & Technol, Chem Engn Dept, Ciudad Real 13071, Spain

关键词: Lindane;    Soil washing effluent;    Anodic oxidation;    Biodegradability;    Toxicity;   

DOI  :  10.1016/j.jhazmat.2019.121237

来源: Elsevier

【 摘 要 】

This paper focuses on the removal of lindane from soil washing effluents (SWEs) using combined electrochemical -biological processes. In particular, it has been evaluated the influence of the anodic material used in the electrolysis of the SWE on the biodegradability and toxicity of the effluents. Four anode materials were tested: Boron Doped Diamond (BDD), Carbon Felt (CF), and Mixed Metal Oxides Anodes with iridium and ruthenium (MMO-Ir and MMO-Ru). These materials were tested at different current densities and electric current charges applied. Lindane, TOC, sulphate, and chlorine species concentrations were monitored during electrochemical experiments, showing important differences in their evolution during the treatment. In spite of reaching a good removal of lindane with all the materials tested, results showed that Boron Doped Diamond working at 15 mA cm(-2) achieved the best biodegradability results in the electrolyzed effluents, because the ratio BOD5/COD increased from 0.2 to 0.5, followed by Carbon Felt anode. Regarding toxicity, Carbon Felt decreased toxicity by 80%. Opposite to what it was expected, MMO anodes did not achieve biodegradability improvement and they only showed reduction in toxicity at high electrical charges.

【 授权许可】

Free