Decontamination of hydrocarbon contaminated soil

• US 5,039,415 A
• Filed: 04/23/1990
• Issued: 08/13/1991
• Est. Priority Date: 04/23/1990
• Status: Expired due to Term

• Current Assignee: Smith, Alvin J.
• Original Assignee: Smith, Alvin J.
• Inventors: Smith, Alvin J.
• Primary Examiner(s): WYSE, THOMAS G
• Application Number:
  US07/512,474
• Time in Patent Office: 477 Days
• Field of Search: 210/610, 210/611, 210/631, 210/639, 210/747, 210/178, 210/620, 134/40, 435/262, 435/264, 405/128
• US Class Current: 210/611
• CPC Class Codes: B09C 1/10 microbiologically, biologically or by using enzymes
• CPC Class Codes: C02F 3/34 characterised by the microorganisms used

Abstract

The method of treating hydrocarbon contaminated soil that includes forming the soil into a flowing particulate stream; forming an aqueous liquid mixture of water and treating substance that reacts with hydrocarbon to form CO₂ and water; dispersing the liquid mixture into the particulate soil stream to wet the particulate; allowing the substance to react with the wetted soil particulate to thereby form CO₂ and water, whereby the resultant soil is beneficially treated.

Claims

1. The method of treating hydrocarbon contaminated soil that includes:

a) forming the soil into a flowing particulate stream,

b) forming an aqueous liquid mixture of water and treating substance that reacts with hydrocarbon to form CO₂ and water,

c) dispersing said liquid mixture into the particulate soil stream to wet the particulate,

d) allowing said substance to react with the wetted soil particulate to thereby form CO₂ and water, thereby the resultant soil is beneficially treated,

e) said stream being freely projected to dwell at a level and then fall, and said dispersing includes spraying the liquid mixture into the projected stream at said dwell,

f) said substance consisting of natural bacteria, and at a concentration level in the mixture of between 100 to 3,000 PPM of bacteria to water,

g) said soil forming step including impacting the soil to reduce it to particles less than about 3/8 inches in cross dimension,

h) and including forming the wetting particulate into a first layer on a surface to allow said substance to react.

2. The method of claim 1 wherein said soil originates underground, where it has been hydrocarbon contaminated in situ, including removing the in situ soil for subjecting it to said forming step.

3. The method of claim 1 including agitating the soil particles in said layer.

4. The method of claim 1 including providing a moving conveyor surface, and supporting the soil particles on said conveyor surface to be projected to dwell.

5. The method of claim 4 including discharging the wetted soil particles off the conveyor and into the air to aerate and fall, for collection.

6. The method of claim 1 wherein the bacteria are selected from the group consisting of

achromobacter

arthrobacter

aspergillus

bacillus

candida

cladosporium

corynebacterium

myrothecium

nocardia

punicillium

phialophora

pseudomonas

rhodothorula

streptomyces

trichoderma

a blend of anaerobic and facultative organisms.

7. The method of claim 1 wherein, after several hours, said first layer is mixed to form a stream of particulate, and the steps of sub-paragraph e) of claim 1 are repeated to form a second layer.

8. The method of claim 7 wherein after several hours the second layer is mixed to form a stream of particulate, and the steps of sub-paragraph e) of claim 1 are repeated using the second layer to form a third layer.

9. The method of treating hydrocarbon contaminated soil that includes:

a) forming the soil into a flowing particulate stream;

b) forming an aqueous liquid mixture of water and treating substance that reacts with hydrocarbon to form CO₂ and water,

c) dispersing said liquid mixture into the particulate soil stream to wet the particulate,

d) allowing said substance to react with the wetted soil particulate to thereby form CO₂ and water, whereby the resultant soil is beneficially treated,

e) said stream being freely projected to fall, and said dispersing includes spraying the liquid mixture into the projected stream,

f) said substance consisting of natural bacteria, and at a concentration level in the mixture of between 100 to 3,000 PPM of bacteria to water,

g) said soil forming step including impacting the soil to reduce it to particles less than about 3/8 inches in cross dimension,

h) and including forming the wetting particulate into a first layer on a surface to allow said substance to react.