System and method for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge

Patent metadata

Field	Value
Publication number	US-10611653-B2
Application number	US-201816046214-A
Country	US
Kind code	B2
Filing date	Jul 26, 2018
Priority date	Feb 11, 2018
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A system and method for combined microorganism degradation and air sparging-soil vapor extraction (AS-AVE) of oil-containing sludge can include a microorganism-adding unit, an AS-SVE unit, a metering-feeding layer, a mixing layer, a material discharging layer and a crawler-type conveyor. In some embodiments the microorganism-adding unit and the AS-SVE unit can include a microorganism storage tank and an AS-SVE storage tank. In some embodiments, the metering-feeding layer can include a valve, a pressure gauge, a flowmeter, a feeding chamber. In some embodiments, the mixing layer can include pipeline connectors and a stirrer. In some embodiments, the material discharging layer is mainly for transporting the treated soil away. The system can remove petroleum, petroleum hydrocarbons, volatile organic compounds (VOCs), and degradable and extractable contaminants from oil-containing sludge by a method combining microorganism degradation, mechanical stirring, AS-AVE and the like, thereby achieving soil remediation and automatic treatment in a large scale.

First claim

What is claimed is:

1. A system for combined microorganism degradation and air sparging-soil vapor extraction (AS-SVE) of an oil-containing sludge comprising:
(a) a microorganism-adding unit;
(b) an AS-SVE unit;
(c) a container for combined treatments comprising
(i) a feed inlet;
(ii) a stirrer; and
(iii) discharge outlet;

(d) a gas/liquid porous converter;
wherein said microorganism-adding unit is used for introducing a microorganism-containing liquid into said container to degrade said oil-containing sludge with a microorganism,
wherein said AS-SVE unit is used for introducing a gas for air sparging into said container to air sparge said oil-containing sludge and to remove an off gas from said oil-containing sludge in the container in an extraction manner,
wherein said stirrer is used for stirring said oil-containing sludge in said container, and
wherein said gas/liquid porous converter is annular and is disposed in a middle of said container, and comprises a plurality of peripherally distributed openings in communication with a plurality of channels, said plurality of channels being alternatively in communication with a transport pipeline of said microorganism-adding unit and an air sparging pipeline of said AS-SVE unit respectively, so as to introduce said microorganism-containing liquid and said gas for air sparging into said container respectively.

2. The system according to claim 1 , wherein said system comprises the following multiple layers from top to bottom:
(A) a microorganism-AS-SVE unit layer comprising
(i) said microorganism-adding unit; and
(ii) said AS-SVE unit, positioned in a top layer of the system;

(B) a metering-feeding layer comprising
(i) said feed inlet of said container;
(ii) said transport pipeline of said microorganism-adding unit;
(iii) said air sparging pipeline of said AS-SVE unit; and
(iv) a metering unit disposed within said container;

(C) a mixing layer comprising
(i) said stirrer; and
(ii) said gas/liquid porous converter disposed on the container; and

(D) a material discharging layer comprising
(i) the discharge outlet of the container.

3. The system according to claim 2 , wherein a sampling unit is configured on an extraction pipeline of the AS-SVE unit to indirectly determine a removal effect of soil contaminants.

4. The system according to claim 1 , wherein said AS-SVE unit comprises an air sparging chamber and an extraction chamber disposed in one receptacle and separated from each other with a separating plate.

5. The system according to claim 1 , wherein said AS-SVE unit comprises an extraction pipeline connected to the container, wherein said connected region is above the gas/liquid porous converter, so as to facilitate a removal of an off gas from said oil-containing sludge.

6. The system according to claim 1 , wherein said system further comprises:
(e) a crawler;
(f) a closed feeding box used for feeding
(g) an automatic stirrer; and
(h) an automatic discharging unit.

7. The system according to claim 1 , wherein said discharge outlet of said container is disposed in a vehicle travelling room, capable of directly self-discharging a material into a vehicle.

8. The system according to claim 1 , wherein said gas/liquid porous converter is annular and configured at a connection region between said stirrer and a feed bin of the container, wherein said gas/liquid porous converter comprises a plurality of holes evenly distributed thereon, and the sizes of said holes are matched with said transport pipeline, wherein said transport pipeline of said microorganism-adding unit and said air-sparging pipelines are disposed alternatively, and wherein a diameter and a material of said transport pipeline and said air-sparging pipeline are determined according to a field scale and types of a plurality of contaminants.

9. A method for treating an oil-containing sludge using said system according to claim 1 , comprising the following steps:
(a) determining a number of said systems, a diameter and a height of a microorganism storage tank of said microorganism-adding unit and a storage tank of said AS-SVE unit according to a field size and an actual total amount of a plurality of contaminants to be treated;
(b) determining a plurality of materials of said transport pipeline and said air-sparging pipeline according to types of a plurality of main contaminants obtained from an on-site preliminary experiment;
(c) mounting and/or adjusting said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge;
(d) determining an amount of microorganism(s) to be added, a mixing amount of said oil-containing sludge, an air sparging time and content, an extraction time and rate, a temperature and a pH parameter by a plurality of experiments;
(e) determining an optimal solution through detecting a plurality of contaminant contents in an extracted gas; and
(f) treating said oil-containing sludge by using said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge.

10. A method for treating an oil-containing sludge using said system according to claim 2 , comprising the following steps:
(a) determining a number of said systems, a diameter and a height of a microorganism storage tank of said microorganism-adding unit and a storage tank of said AS-SVE unit according to a field size and an actual total amount of a plurality of contaminants to be treated;
(b) determining a plurality of materials of said transport pipeline and said air-sparging pipeline according to types of a plurality of main contaminants obtained from an on-site preliminary experiment;
(c) mounting and/or adjusting said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge;
(d) determining an amount of microorganism(s) to be added, a mixing amount of said oil-containing sludge, an air sparging time and content, an extraction time and rate, a temperature and a pH parameter by a plurality of experiments;
(e) determining an optimal solution through detecting a plurality of contaminant contents in extracted gas; and
(f) treating said oil-containing sludge by using said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge.

11. A method for treating an oil-containing sludge using said system according to claim 3 , comprising the following steps:
(a) determining a number of said systems, a diameter and a height of a microorganism storage tank of said microorganism-adding unit and a storage tank of said AS-SVE unit according to a field size and an actual total amount of a plurality of contaminants to be treated;
(b) determining a plurality of materials of said transport pipeline and said air-sparging pipeline according to types of a plurality of main contaminants obtained from an on-site preliminary experiment;
(c) mounting and/or adjusting said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge;
(d) determining an amount of microorganism(s) to be added, a mixing amount of said oil-containing sludge, an air sparging time and content, an extraction time and rate, a temperature and a pH parameter by a plurality of experiments;
(e) determining an optimal solution through detecting a plurality of contaminant contents in an extracted gas; and
(f) treating said oil-containing sludge by using said system for combined microorganism degradation and air sparging-soil vapor extraction of oil-containing sludge.

12. A method for treating an oil-containing sludge using the system accordi

Assignees

• Chinese Res Acad Env Sciences

Inventors

• Li Juan
• Xi Beidou
• Zhao Chuanjun
• Wang Yang
• Tang Jun
• Su Jing
• Chen Lei
• Yang Yang

Classifications

• C02F3/1284 Primary

  Mixing devices · CPC title

• B09C1/005

  Extraction of vapours or gases using vacuum or venting · CPC title

• B09C1/10 Primary

  microbiologically, {biologically} or by using enzymes · CPC title

• C02F3/22

  using circulation pipes · CPC title

• C02F2101/322

  Volatile compounds, e.g. benzene · CPC title