Remediation of phenanthrene from contaminated kaolinite by electroremediation-Fenton technology.
Polycyclic aromatic hydrocarbons (PAHs) cause a high environmental impact when released into the environment. The objective of this study was to evaluate the capacity to decontaminate polluted soils with phenanthrene as a model PAH using a combination of two technologies: electrokinetic remediation and Fenton process. Kaolinite was used as a model sample that was artificially polluted at the laboratory at an initial concentration of phenanthrene of 500 mg kg(-1) of dried kaolinite. The standard electrokinetic process resulted in negligible removal of phenanthrene from the kaolinite sample. Faster and more efficient degradation of this compound can be promoted by introduction of a strong oxidant into the soil such as hydroxyl radicals. For this reason, the Fenton reactions have been induced in several experiments in which H(2)O(2) (10%) was used as flushing solution, and kaolinite polluted with iron was used. When anode and cathode chambers were filled with H(2)O(2) (10%), the kaolinite pH is maintained at an acid value around 3.5 without pH control and an overall removal and destruction efficiency of phenanthrene of 99% was obtained in 14 days by applying a voltage gradient of 3 V cm(-1). Therefore, it is evident that a combined technology of electrokinetic remediation and Fenton reaction is capable of simultaneously removing and degrading of PAHs in polluted model samples with kaolinite.
Department of Chemical Engineering, University of Vigo, Vigo, Spain.
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Alcantara
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Pazos
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Gouveia
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Cameselle
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Sanroman
D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D052918:Environmental Restoration and Remediation; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007616:Kaolin / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry* / Q000302:isolation & purification; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000302:isolation & purification; D012989:Soil Pollutants / Q000737:chemistry / Q000302:isolation & purification
D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D007616:Kaolin; C031181:phenanthrene; D006861:Hydrogen Peroxide