Abstract
Studies on the intensification of water solubility for polycyclic aromatic hydrocarbons (PAHs) including phenanthrene and pyrene using individual surfactant and dissolved organic matter (DOM) fractionated from pig wastewater or mixed surfactant–DOM solutions were conducted. Excess surfactant dosages producing critical micelle concentration (CMC) dramatically enhance the solubility of phenanthrene and pyrene in the contaminated soil. The synergetic effect from non-ionic surfactants such as polyoxyethylene sorbitan fatty acid ester, and Tween 80, and DOM on the solubility of PAHs was also evaluated using batch experiments. The current study shows that the solubility of PAHs is respectively increased with an increase in the concentrations of Tween 80 or DOM, especially in the dosage of CMC or high hydrophobic property of DOM. Furthermore, an increase in the solubility of PAHs strengthened by the coexistence of Tween 80 and DOM was strongly affected by the concentration of Tween 80. It proves that the selection of optimal surfactant dosage is the key factor while the way is possibly applied into the remediation technologies in the on-site soil region with pollution.
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