Method for treating soil contaminated with hydrocarbons, in particular with polycyclic aromatic hydrocarbons

Patent metadata

Field	Value
Publication number	US-2022410232-A1
Application number	US-202017763040-A
Country	US
Kind code	A1
Filing date	Oct 7, 2020
Priority date	Oct 7, 2019
Publication date	Dec 29, 2022
Grant date	—

Abstract

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%.

First claim

1 . A method for treating a soil containing 3 to 50% by weight of water, said sol 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 from 0.1 to 10% hydraulic binder.

2 . The method according to claim 1 , wherein the hydraulic binder/activated carbon mass ratio is comprised between 0.2 and 9.

3 . The method according to claim 1 , wherein the activated carbon has a specific surface area greater than 100 m 2 /g.

4 . The method according to claim 1 , wherein the binder is a Portland cement defined in standard NF EN 197-1 of April 2012, a CEM III cement comprising between 30% and 90% by weight of ground blast furnace slag, a sulfoaluminate cement or a calcium aluminate cement.

5 . The method according to claim 1 , wherein the hydraulic binder and the activated carbon are added simultaneously to the soil.

6 . The method according to claim 1 , wherein the activated carbon and the hydraulic binder are added separately to the soil.

7 . A product obtained from the method according to claim 1 , comprising a soil, a hardened binder and activated carbon.

8 . A composition for the treatment of soil contaminated by hydrocarbons, comprising in % by weight:
between 10 and 80% of a hydraulic binder, between 10 and 80% of activated carbon.

9 . The composition according to claim 8 , wherein the hydraulic binder is a Portland cement such as defined in standard NF EN 197-1 of April 2012, a CEM III cement comprising between 30% and 90% by weight of ground blast furnace slag, a sulfoaluminate cement or a calcium aluminate cement.

10 . A method for the treatment of soil contaminated by hydrocarbons comprising a step of contacting the soil with the composition defined in claim 8 .

11 . The method according to claim 1 , wherein the soil is contaminated with polycyclic aromatic hydrocarbons.

12 . The method according to claim 1 , wherein the total content of activated carbon and hydraulic binder is comprised between 0.5% and 15%.

13 . The method according to claim 2 , wherein the hydraulic binder/activated carbon mass ratio is comprised between 0.5 and 9.

14 . The method according to claim 2 , wherein the hydraulic binder/activated carbon mass ratio is comprised between 1 and 4.

15 . The method according to claim 3 , wherein the activated carbon has a specific surface area greater than 400 m 2 /g.

16 . The method according to claim 3 , wherein the activated carbon is grafted with additional chemical functions.

17 . The method according to claim 6 , wherein the activated carbon is added first.

18 . The composition according to claim 8 for the treatment of soil contaminated by polycyclic aromatic hydrocarbons.

19 . The composition according to claim 9 , wherein the hydraulic binder is a CEM III cement comprising between 30% and 90% by weight of ground blast furnace slag.

20 . The method according to claim 10 , for the treatment of soil contaminated by polycyclic aromatic hydrocarbons.

Assignees

• Holcim Technology Ltd

Inventors

• Hoang Le-Chien
• Tapsoba Nouffou
• Serclerat Ivan

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B28/065

  Calcium aluminosulfate cements, e.g. cements hydrating into ettringite · CPC title

• C04B2111/00767

  for waste stabilisation purposes · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title