Process for the rehabilitation of soils contaminated by hydrocarbons and other biodegradable substances
AssigneeCeca S.A.
InventorChristian Schulz
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Abstract
The contaminated soil is first treated by spreading a nutrient for aerobic microbial flora of the N/P type in oleophilic form, then by the addition of straw and of a hydrophilic nutrient of the N/P/K type which are buried by mechanical mixing. A biological process takes place which brings the hydrocarbon content below 500 mg/kg of soil after some months. The oleophilic nutrient N/P is preferably a microemulsion of a solution of N/P salts in a fat-soluble hydrocarbon solvent.
Claims10
Process for the rehabilitation of soils polluted by hydrocarbons in which the activity of an endogenous microbial flora suited to the degradation of hydrocarbons is fostered through the addition of nutrients that are scarce in relation to an ideal ratio for bacterial development of 100/20/1, characterized in that one applies to the soil to be treated:
- a nutrient of the nitrogen/phosphorous type, in the oleophilic form of a microemulsion of solution of nitrogen/phosphorous salts in a fat-soluble hydrocarbon solvent,
- a nutrient of the nitrogen/phosphorous/potassium type, in the hydrophilic form of granules of nitrogen/phosphorous/potassium salts, and
- a texturing agent for aeration.
Process for the rehabilitation of soils polluted by hydrocarbons in which the activity of an endogenous microbial flora suited to the degradation of hydrocarbons is fostered through the addition of nutrients that are scarce in relation to an ideal ratio for bacterial development carbon/nitrogen/phosphorous of 100/20/1, characterized in that one applies to the soil to be treated:
- a nutrient of the nitrogen/phosphorous type in oleophilic form, wherein said nutrient is a microemulsion of the type:
- solution of nitrogen/phosphorous salts in a fat-soluble hydrocarbon solvent and
- a nutrient of the nitrogen/phosphorous/potassium type in hydrophilic form.
Dependencies are inferred from the claim text.