Abstract:

Eleven kinds of chemical reagents were chosen to modify peat to improve its ability of absorbing TPH. The results show that after it was modified by HCl,NaOH,CH₃COOH,Mg²⁺, sodium citrate, PO^3-₄, the ability of absorbing TPH of peat is reduced, but after modified with Ca²⁺,Fe³⁺ ,Cu²⁺,EDTA,humic acid, it is improved. After modified with 0.100 mol/L Ca²⁺, the remove rate of TPH is as high as 92.26%. The adsorption of it for TPH conforms with the Langmuir isothermal adsorption equation and the maximum adsorption in theory is 2.04 g/g. Its adsorption kinetics model conforms with the secondorder kinetics, and 60 min later, the adsorption reaches dynamic equilibrium. Observed results before and after adsorption show that there are both physical and chemical adsorptions in the process of peat for petroleum.

Key words:  , peat； petroleum contaminated； groundwater； permeable reactive barrier (PRB) repair； chemical reagent