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Treating highly Phenol and PAHs-contaminated soil using catalystic complexes and peroxide

FirstTech Institutional Repository


[[abstract]]Abstract PAHs (polycyclic aromatic hydrocarbon) frequently appears in the middle of the name list which the US EPA first eliminates they majority of all have the toxicity send mutation and carcinogens Often appears in the pollution soil also because the concentration of contaminant too is high certainly is not suitable the biological way to process but must moreover take out processes by chemistry method By the literature in knew chemical oxidation mean take Heme as the catalyst may process TCP and soil of the PCP pollution the processing result may reach 77%; But take EDTA-Fe as the catalyst may process 3-MCP and soil of processing result the DCP pollution may reach 92% and peroxide were employed as treatment reagents By using different catalysts it was interesting to know whether the free and bound metal making any difference in terms of catalytic effect There were three goals in this study including (1)To identify the most important metallic complexes in PAHs degradation (2)To optimize the treatment conditions for soil PAHs removal (3)To study the PAHs degradation kinetics at the optimal treatment conditions The studied metallic catalysts included heme EDTA+ddH2O EDTA-Fe EDTA-Mg EDTA-Cu Fe2+ Mg2+ and Cu2+ For each treatment 2-gram 1000 ppm PAHs-contaminated soil mixed with a catalyst and H2O2 then reacted for 24 hours before solvent extraction and PAHs quantification For experimental design factorial experiments were used to identify the most important catalyst(s) in PAHs oxidation Response surface methodology (RSM) was used to determine the optimal conditions for PAHs oxidation And a first-order degradation kinetic model was used and its rate coefficients were determined The results showed that: (1)Screens best metal catalyst EDTA-Fe by adding 51μmole–EDTA /2g-soil 54μmole-FeSO4‧7H2O/2g-soil 4mmole-H2O2/2g-soil about 40%PAHswere degraded (2) At 51μmole–EDTA/2g-soil 332μmole-FeSO4‧7H2O / 2g-soil and 4mmole-H2O2/2g-soil the optimal removal of PAHs was close to 65 8% (3) At the optimal doses the rate coefficients of the first-order PAHs degradation were 1 85 hr-1

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