Treatment of ex-situ soil-washing fluids polluted with petroleum by anodic oxidation, photolysis, sonolysis and combined approaches

被引:60
作者
dos Santos, Elisama Vieira [1 ]
Saez, Cristina [2 ]
Canizares, Pablo [2 ]
da Silva, Djalma Ribeiro [3 ]
Martinez-Huitle, Carlos A. [3 ]
Rodrigo, Manuel A. [2 ]
机构
[1] Univ Fed Rio Grande do Norte, Sch Sci & Technol, Campus Univ, BR-59078970 Natal, RN, Brazil
[2] Dept Chem Engn, Enrique Costa Bldg,Campus Univ S-N, Ciudad Real 13071, Spain
[3] Univ Fed Rio Grande do Norte, Inst Chem, Campus Univ, BR-59078970 Natal, RN, Brazil
关键词
Petroleum; Soil washing; Sonolysis; Photo-electrolysis; Sono-electrolysis; Diamond electrode; DIAMOND ELECTROCHEMICAL OXIDATION; CONTAMINATED SOIL; ORGANIC-COMPOUNDS; REMOVAL; WATER; TECHNOLOGY; DEGRADATION; PHENANTHRENE; ELECTROLYSIS; REMEDIATION;
D O I
10.1016/j.cej.2016.05.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this research, the treatment of soil spiked with petroleum was studied using a surfactant-aided soil washing (SASW) process followed by sonolysis (US), photolysis and boron doped diamond electrolysis (BDD-electrolysis) for washing liquid treatment. Results clearly demonstrate that SASW is a very efficient approach in the treatment of soil, removing completely the petrochemical compounds by using dosages about 5 g of extracting surfactant (sodium dodecyl sulfate (SDS)) per kg of soil. The main characteristics of the effluents produced in this soil remediation technology as well as the efficiency of the treatment (US, photolysis and BDD-electrolysis) depend on the dosage of SDS. Depollution of the effluents (degradation and mineralization of the organic matter) is related to the reduction in size of micelles formed by SDS and petroleum, and it depends on the treatment used. US and photolysis were inefficient decontamination processes, while BDD-electrolysis favors the complete depletion of micelles. However, the intensification of the efficiency was attained by synergic degradation effects when UV light irradiation and US were coupled with BDD-electrolysis, US/BDD-electrolysis and photo/BDD-electrolysis, respectively. Sulfate (coming from SDS) ions play an important role during the BDD-electrolysis, US/BDD-electrolysis and photo/BDD-electrolysis because persulfate and persulfate radicals are produced (by sulfate activation, applying US or photolysis), improving the efficiency of the processes. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:581 / 588
页数:8
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