Method for treating soil contaminated with hydrocarbons, in particular with polycyclic aromatic hydrocarbons
A method for treating soil contaminated with hydrocarbons, in particular with polycyclic aromatic hydrocarbons, includes working the soil with, by weight of soil from 0.1 to 12% of activated carbon; and from 0.1 to 10% of hydraulic binder, the total content of activated carbon and of hydraulic binder in particular ranging between 0.5 and 15%.
1 . A method for treating a soil containing 3 to 50% by weight water, said soil being-contaminated with hydrocarbons, and said method comprising at least one step of working the soil with, by weight of soil:
from 0.1 to 12% activated carbon to adsorb hydrocarbons from the soil; and
from 0.1 to 10% hydraulic binder to encapsulate the activated carbon and to prevent the release of adsorbed hydrocarbons,
wherein the hydraulic binder comprises calcium aluminate cement, and
wherein the hydraulic binder/activated carbon ratio is comprised between 0.2 and 1.
2 . The method according to claim 1 , wherein the activated carbon has a specific surface area greater than 100 m 2 /g.
3 . The method according to claim 1 , wherein the hydraulic binder further comprises a Portland cement chosen from a CEM I, CEM II, CEM III, CEM IV, CEM V as defined in standard NF EN 197-1 of April 2012 or a sulfoaluminate cement.
4 . The method according to claim 1 , wherein the hydraulic binder and the activated carbon are added simultaneously to the soil.
5 . The method according to claim 1 , wherein the activated carbon and the hydraulic binder are added separately to the soil.
6 . The method according to claim 1 , wherein the soil is contaminated with polycyclic aromatic hydrocarbons.
7 . The method according to claim 1 , wherein the total content of activated carbon and hydraulic binder is between 0.5% and 15%.
8 . The method according to claim 2 , wherein the activated carbon has a specific surface area greater than 400 m 2 /g.
9 . The method according to claim 2 , wherein the activated carbon is grafted with additional chemical functions.
10 . The method according to claim 5 , wherein the activated carbon is added first.
11 . The method according to claim 1 , wherein the activated carbon comprises a D50 between 5 and 100 μm.
12 . The method according to claim 1 , wherein the activated carbon has a specific surface area greater than 500 m 2 /g.
13 . The method according to claim 7 , wherein the total content of activated carbon and hydraulic binder is between 2% and 5%.
14 . The method according to claim 3 , wherein the hydraulic binder further comprises a Portland cement chosen from a CEM II, CEM III, CEM IV, CEM V as defined in standard NF EN 197-1 of April 2012 or a sulfoaluminate cement.
15 . A method for the treatment of soil contaminated by hydrocarbons comprising a step of contacting the soil with a composition comprising in % by weight: between 70 to 80% of a hydraulic binder for encapsulating the activated carbon after adsorption of hydrocarbons in the soil, and
between 20 and 30% of activated carbon,
wherein the hydraulic binder comprises calcium aluminate cement, and
wherein the hydraulic binder/activated carbon ratio is comprised between 0.2 and 1.
16 . The method according to claim 15 , wherein the hydrocarbons are polycyclic aromatic hydrocarbons.