Remediation of PAH spiked soils: concentrated H2O2 treatment/continuous hot water extraction-oxidation.
Artificially contaminated soil with four different polynuclear aromatic hydrocarbons (acenaphthene, phenathrene, anthracene and fluoranthene) has been separately treated by two different processes: (A) concentrated hydrogen peroxide at mild conditions of temperature (343-393 K) and pressure (0.5 MPa) and (B) hot water extraction at relatively high temperature (523-657 K) and pressure (10 MPa). Both methods achieve acceptable PAH removal percentages from soil. Acenaphthene (the most soluble PAH) is completely removed with treatment A regardless of the operating conditions used. Under optimum conditions, the rest of PAHs are also eliminated to a high extent with both technologies. Temperature and hydrogen peroxide amount seem to play a major role in process A. Similarly, temperature and water flowrate are the most influencing parameters in process B. In the latter case, a post-stage for the extracting water cleaning is required.
Rivas
Javier
J
Departamento de Ingeniería Química y Química Física, Facultad de Ciencias, Avenida de Elvas S/N, 06071 Badajoz, Spain. fjrivas@unex.es
Gimeno
Olga
O
de la Calle
Ruth G
RG
Portela
Juan R
JR
de la Ossa
Enrique Martínez
EM
D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D011083:Polycyclic Compounds / Q000302:isolation & purification*; D012989:Soil Pollutants / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry
D011083:Polycyclic Compounds; D012989:Soil Pollutants; D014867:Water; D006861:Hydrogen Peroxide