The more and more nitro aromatic compounds have been detected in the environment

and one of the most popular compounds was p-nitrophenol. To improve the removal effect of p-nitrophenol using soil aquifer system (SAT)

the system was innovated with iron-oxide coated sand as the aquifer media. Characterization of the iron coated SAT shows that surface of the oxidized iron film was flocculent or lamellar without fixed shape. Ironoxide coated sand has pore structure and makes the specific surface increased 2 times to 4 times. Study of absorption kinetics indicated that the absorption kinetics were governed by the Freundlich model of chemical adsorption

and the absorption capacity was much enhanced. The diffusion model study demonstrated the pore diffusion was higher than sufficient diffusion. The results of the mini-column break through show that the adsorption is closely related to the residence time of the solute in the medium

so the flow rate should be appropriately controlled during the SAT operation.