This study was conducted to find proper operational parameters for electrokinetic(EK) process of polycyclic aromatic hydrocarbons (PAHs)- contaminated soil. Bench-scale reactors were used for this research. The soil used for this research was sandy soil. Phenanthrene and pyrene, having different num...
This study was conducted to find proper operational parameters for electrokinetic(EK) process of polycyclic aromatic hydrocarbons (PAHs)- contaminated soil. Bench-scale reactors were used for this research. The soil used for this research was sandy soil. Phenanthrene and pyrene, having different number of benzene rings, were selected as target PAHs compounds. Triton X- 100 (non-ionic surfactant) and SDS (sodium dodecyl sulfate, anionic surfactant) was used as surfactants. Phenanthrene and pyrene were spiked at 1,000 mg/kg of dry soil. The target compounds were analyzed by a gas chromatograph (Hewlett Packard Model 5890 Series II) equipped with an integrator (Hewlett Packard Model 3395) and a flame ionization detector. The electokinetic systems consisted of column reactor, anode and cathode assembly, power supply, peristaltic pump, and et. al. The reactor was transparent acrylic column with an inner diameter of 50 mm and length of 100 mm. Electrolyte and surfactant were fed to the anode chamber by a peristaltic pump. In order to evaluate PAHs removal efficiency, soil flushing technology was compared with electrokinetic process. The PAHs removal efficiency of electrokinetics was 83.6 %, while it was 59.5% for soil flushing. The PAHs removal efficiency of electrokinetics was 24.1 % higher than that of soil flushing. The operational conditions to obtain maximum PAHs removal efficiency were evaluated in terms of surfactant type and concentration, operational period, and voltage of power supply. As a result of surfactant, 2 % Triton X-100 removed phenanthrene and pyrene efficiently. The removal efficiencies of 1% and 2% SDS surfantants were below 20%. In case of 1% Triton X-100, approximately 35% was removed for phenanthrene and pyrene. However, 2% Triton X-100 increased the removal efficiencies for phenanthrene and pyrene up to about 80% significantly. Comparing electrolyte with surfactant, surfactant showed the high removal efficiency, which was 21.5% higher than that of electrolyte. After 192 hours of operation, effluent was not discharged. So it was evaluated that PAHs was almost removed within 192 hours. When the voltage of power supply was increase from 15V to 30V, the removal efficiency was increased from 86% to 93% for phenanthrene and from 81% to 89% for pyrene, respectively. As the results of all electrokinetic operational parameters, phenanthrene, having 3 benzene rings, was removed more effectively than pyrene of 4 benzene.
This study was conducted to find proper operational parameters for electrokinetic(EK) process of polycyclic aromatic hydrocarbons (PAHs)- contaminated soil. Bench-scale reactors were used for this research. The soil used for this research was sandy soil. Phenanthrene and pyrene, having different number of benzene rings, were selected as target PAHs compounds. Triton X- 100 (non-ionic surfactant) and SDS (sodium dodecyl sulfate, anionic surfactant) was used as surfactants. Phenanthrene and pyrene were spiked at 1,000 mg/kg of dry soil. The target compounds were analyzed by a gas chromatograph (Hewlett Packard Model 5890 Series II) equipped with an integrator (Hewlett Packard Model 3395) and a flame ionization detector. The electokinetic systems consisted of column reactor, anode and cathode assembly, power supply, peristaltic pump, and et. al. The reactor was transparent acrylic column with an inner diameter of 50 mm and length of 100 mm. Electrolyte and surfactant were fed to the anode chamber by a peristaltic pump. In order to evaluate PAHs removal efficiency, soil flushing technology was compared with electrokinetic process. The PAHs removal efficiency of electrokinetics was 83.6 %, while it was 59.5% for soil flushing. The PAHs removal efficiency of electrokinetics was 24.1 % higher than that of soil flushing. The operational conditions to obtain maximum PAHs removal efficiency were evaluated in terms of surfactant type and concentration, operational period, and voltage of power supply. As a result of surfactant, 2 % Triton X-100 removed phenanthrene and pyrene efficiently. The removal efficiencies of 1% and 2% SDS surfantants were below 20%. In case of 1% Triton X-100, approximately 35% was removed for phenanthrene and pyrene. However, 2% Triton X-100 increased the removal efficiencies for phenanthrene and pyrene up to about 80% significantly. Comparing electrolyte with surfactant, surfactant showed the high removal efficiency, which was 21.5% higher than that of electrolyte. After 192 hours of operation, effluent was not discharged. So it was evaluated that PAHs was almost removed within 192 hours. When the voltage of power supply was increase from 15V to 30V, the removal efficiency was increased from 86% to 93% for phenanthrene and from 81% to 89% for pyrene, respectively. As the results of all electrokinetic operational parameters, phenanthrene, having 3 benzene rings, was removed more effectively than pyrene of 4 benzene.
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#Electrokinetic process PAHs 오염토양 정화 환경공학
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