Method for rendering waste substances harmless
First Claim
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1. A method for the treatment of hydrocarbon-contaminated soil by at least on of chemical hydrolysis and oxidation of said hydrocarbons in said hydrocarbon-contaminated soil, said method comprising:
- a) treating lime with a fatty acid hydrophobizing agent, said fatty-acid having of from about 6 to about 12 carbon atoms therein, and preheating said treated lime to a temperature of about 50°
C. to about 80°
C. thereby to provide conditioned lime;
b) intimately blending said conditioned lime, in a ratio of from about 1;
16 to about 1;
1, with physically-preconditioned moist, hydrocarbon-contaminated soil, under conditions of high shear, the degree of blending being at least near microscopic level, thereby providing blended, conditioned lime/soil;
c) conveying a charge of said blended conditioned lime/soil to an enclosed reaction vessel and carrying out hydration of said lime in said blended conditioned lime/soil charge;
d) retaining the heat of said hydration reaction within said vessel, whereby hydrolysis of at least one of said fatty acid hydrophobizing agent and hydrocarbon contaminants in said soil is initiated;
e) substantially simultaneously introducing at least one of air, and oxygen-enriched air, into said reaction vessel together with at least one of steam and water, thereby to effect a flameless, intermediate-temperature oxidation of at least one of said hydrocarbons and hydrolysed degradation products of said hydrocarbons;
f) contacting organic constituents and residues of incomplete oxidation as the products of step (e) with said conditioned lime/soil charge at a progressively increasing temperature;
g) discharging decontaminated soil product from said reaction vessel by passing said decontaminated soil product, in dry, dusty, hydrophobic form through a zone where it may be sprayed with a surfactant, thereby to provide treated decontaminated soil product; and
h) passing said treated decontaminated soil product from step g) to a blender, where it is mixed with water in an amount ranging from about 5% to about 25, based on the quantity of said treated decontaminated soil product, thereby to provide a substantially dust-free product.
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Abstract
A method is provided for the treatment of hydrocarbon-contaminated soil by chemical hydrolysis and/or oxidation of the hydrocarbons in the hydrocarbon-contaminated soil. The method includes conditioning lime with a fatty acid hydrophobizing agent. The fatty acid treated lime is preheated to a temperature of about 50° C. to about 80° C. to provide conditioned lime.
25 Citations
21 Claims
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1. A method for the treatment of hydrocarbon-contaminated soil by at least on of chemical hydrolysis and oxidation of said hydrocarbons in said hydrocarbon-contaminated soil, said method comprising:
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a) treating lime with a fatty acid hydrophobizing agent, said fatty-acid having of from about 6 to about 12 carbon atoms therein, and preheating said treated lime to a temperature of about 50°
C. to about 80°
C. thereby to provide conditioned lime;b) intimately blending said conditioned lime, in a ratio of from about 1;
16 to about 1;
1, with physically-preconditioned moist, hydrocarbon-contaminated soil, under conditions of high shear, the degree of blending being at least near microscopic level, thereby providing blended, conditioned lime/soil;c) conveying a charge of said blended conditioned lime/soil to an enclosed reaction vessel and carrying out hydration of said lime in said blended conditioned lime/soil charge; d) retaining the heat of said hydration reaction within said vessel, whereby hydrolysis of at least one of said fatty acid hydrophobizing agent and hydrocarbon contaminants in said soil is initiated; e) substantially simultaneously introducing at least one of air, and oxygen-enriched air, into said reaction vessel together with at least one of steam and water, thereby to effect a flameless, intermediate-temperature oxidation of at least one of said hydrocarbons and hydrolysed degradation products of said hydrocarbons; f) contacting organic constituents and residues of incomplete oxidation as the products of step (e) with said conditioned lime/soil charge at a progressively increasing temperature; g) discharging decontaminated soil product from said reaction vessel by passing said decontaminated soil product, in dry, dusty, hydrophobic form through a zone where it may be sprayed with a surfactant, thereby to provide treated decontaminated soil product; and h) passing said treated decontaminated soil product from step g) to a blender, where it is mixed with water in an amount ranging from about 5% to about 25, based on the quantity of said treated decontaminated soil product, thereby to provide a substantially dust-free product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Current AssigneeThe Ani Corporation Ltd.
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Original AssigneeRobert A. Ritter
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InventorsRitter, Robert A.
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Primary Examiner(s)BRUNSMAN, DAVID M
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Application NumberUS08/229,672Time in Patent Office385 DaysField of Search106/244, 106/250, 106/266, 588/226US Class Current588/317CPC Class CodesB09C 1/08 chemicallyC09K 17/00 Soil-conditioning materials...C09K 17/40 containing mixtures of inor...C09K 3/32 for absorbing liquids to re...Y02W 10/40 Valorisation of by-products...
