Modified rice husk hydrochars enhanced surfactant leaching remediation of phenanthrene pyrene contaminated soil

Abstract The adsorption capacity of soil itself makes it difficult to efficiently remove phenanthrene and pyrene from soil by direct leaching. In this article, hydrochar was introduced into the leaching process after modification, and the enhanced leaching effect of hydrothermal carbon was explored under various influencing factors. The experimental results show that the modified hydrochar competes with the soil for adsorption during the leaching process, promotes the desorption of pollutants and adsorbs some pollutants in the leaching solution, which greatly enhances the leaching effect. The elution of phenanthrene increased from 64.06% to 91.08% and of pyrene from 70.26% to 91.13% under the optimum enhanced drenching conditions. This work provides some new ideas for the removal of PAHs from the natural soil environment.