METHOD FOR TREATMENT OF OIL-BASED SLUDGE USING THERMAL DESORPTION

Abstract

A method for the treatment of oil-based sludge by thermal desorption, characterized in that it comprises a step of conditioning of the sludge to be treated which includes the conditioning of the oil-based sludge with rice husk in a 1:2 ratio, before entering the TDU, increasing the technical and economic viability and cost relation of the thermal desorption for oil-based sludge treatment, showing better performance, and making possible the treatment of sludge on an industrial scale with effective rates of 28.6 m3/day, oil recovery of 54%, with a volumetric increase of 19%, compared to the original volume, and a fuel consumption adjusted to the historical data of the TDU from the economic point of view, which allows to have a high amount of rice husk, reducing the costs associated with the elimination of this agro-industrial waste.

Claims

1. A method for treating oil-based sludge by thermal desorption, comprising an oil-based sludge conditioning stage in which rice husk is added before a sludge enters to a rotary kiln of a Thermal Desorption Unit (TDU).

2. The method of treating oil-based sludge by thermal desorption of claim 1, wherein said method is a high temperature indirect thermal desorption method.

3. A method of treating oil-based sludge by thermal desorption comprising the following steps: (a) Conditioning the oil-based sludge by adding rice husk; (b) Putting the mixture in a rotary kiln that transfers the heat from the combustion of a fossil fuel to the mixture; (c) Heating the mixture to generate desorption of the water and the organic components from the solid matrix; (d) Passing the vapors generated in stage (c) through condensers that, through heat exchange, return said vapors to liquid state; (e) Transporting the liquid to oil and water recovery tanks; and (f) Transferring the treated solid to a pit.

4. The method of treating oil-based sludge by thermal desorption of claim 3, further comprising a stage prior to addition of rice husk in which the sludge is initially characterized to be treated by a retort process.

5. The method of treating oil-base sludge by thermal desorption of according to claim 3, wherein the volumetric increase of the oil-based sludge, once the oil scale is added rice is 5% to 35% with respect to the initial volume of oil-base sludge.

6. The method of treating oil-base sludge by thermal desorption of according to claim 3, wherein the ratio of oil-based sludge and rice husk is 1:1 to 1:1.5.

7. The method of treating oil-based sludge by thermal desorption of claim 3, wherein the ratio of oil-based sludge and rice husk is 1:1.5 to 1:1.3.

8. The method of treating oil-based sludge by thermal desorption of claim 3, wherein the ratio of oil-based sludge and rice husk is 1:1.2.

9. The method of treating oil-based sludge by thermal desorption of claim 3, wherein the heating that occurs in the stage (c) is carried out at temperatures ranging from 500° C. to 700° C.

10. The method of treating oil-based sludge by thermal desorption of claim 3, further comprising a step (g) of oven cleaning, in which the oven is cooled to a temperature of 250° C. to 300° C., followed by increasing the temperatures between 550° C. and 600° C. while the unit is rotated to fracture and shed the crusts that form on the oven walls.

Description

DESCRIPTION OF THE FIGURE

[0031] For a better understanding of the invention, the following figures are included:

[0032] FIG. 1: Comparison of physical appearance between original residue and residue mixed with rice husk.

[0033] FIG. 2: Phase separation in analysis of sludge mixture with rice husk.

[0034] FIG. 3: Preparation of oil-based sludge and rice husk mixture to industrial scale

[0035] FIG. 4: Stability results in oven temperatures of the TDU for days 1, 2, 3 and 4 of tests.

[0036] FIG. 5: Stability results in oven temperatures of the TDU for days 5, 6, 7 and 8 of tests.

[0037] FIG. 6: Photograph of the formation of crusts of refractory material inside from the TDU oven.