Three reaction media(zero valent iron,activated carbon and zeolite) were used to design five kinds of permeable reactive barriers(PRB) to study the feasibility and the efficiency of the PRB technology in the remediation of leachate-polluted groundwater.The designs of the reactors considered the relation of the permeability of the reactor and the permeability of the aquifer.The result indicated that the COD removal rates in the two reactors with zero valent iron and activated carbon were 89% and 90% respecti...