Method for co-processing of waste incineration fly ash and chromium slag in landfill

Patent metadata

Field	Value
Publication number	US-11298732-B2
Application number	US-201916722818-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Jun 20, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

Disclosed is a method of simultaneously processing fly ash and COPR, which can treat the fly ash and COPR harmlessly during the landfilling process through biochemical and engineering measures. The method includes: transferring the fly ash and COPR to the yard; laying an impervious layer inside the yard; laying a diversion material at a bottom of the yard; laying a mixture layer on the diversion material, where the mixture layer contains a biogas residue, a waste carbon source, ferrous sulfate, a nutritional additive, the waste incineration fly ash and COPR; placing an internal-electrolysis ceramsite layer on the mixture layer; injecting a carbon source solution from an upper portion of the yard and collecting a leachate to a collection device through the diversion material irregularly during the operation; and recirculating the leachate to a top of the yard for spray reinjection.

First claim

What is claimed is:

1. A method for simultaneously processing a waste incineration fly ash and a chromite ore processing residue (COPR) in a landfill, comprising:
laying an impervious layer at inner side walls of a yard;
laying a diversion material at a bottom of the yard;
laying a mixture layer on the diversion material, wherein the mixture layer comprises a biogas residue, a waste carbon source, ferrous sulfate, a nutritional additive, the waste incineration fly ash and COPR;
placing an internal-electrolysis ceramsite layer on the mixture layer;
injecting a carbon source solution from an upper portion of the yard and collecting a leachate to a collection device through the diversion material irregularly; and
recirculating the leachate to a top of the yard for spray reinjection.

2. The method of claim 1 , wherein in the mixture layer, a weight ratio of the waste incineration fly ash to COPR to the biogas residue to the waste carbon source to ferrous sulfate to the nutritional additive is 1:(0.1-10):(0.01-5):(0.01-5):(0.15-3):(0.1-1).

3. The method of claim 1 , wherein the mixture layer has a thickness of 1-8 m; and the internal-electrolysis ceramsite layer has a thickness of 1 m or less.

4. The method of claim 1 , wherein the spray reinjection of the leachate is performed at a time interval of 1-48 h.

5. The method of claim 1 , wherein the step of recirculating the leachate to a top of the yard for spray reinjection comprises adjusting the leachate to pH 2-5.

6. The method of claim 1 , wherein the biogas residue is organic wastewater, solid organic waste or sludge.

7. The method of claim 6 , wherein the biogas residue is an anaerobically-treated solid organic waste.

8. The method of claim 1 , wherein the injection of the carbon source solution is performed once every 1-100 days.

9. The method of claim 1 , wherein the nutritional additive is a nitrogen source, a phosphorus source, a trace element source or a combination thereof.

10. The method of claim 9 , wherein a carbon source is 50% or less by weight of the carbon source solution.

11. The method of claim 9 , wherein the trace element source is selected from the group consisting of boron, zinc, copper, manganese, cobalt and a combination thereof.

12. The method of claim 1 , wherein the carbon source solution is a solution comprising ethanol, methanol, acetic acid or a combination thereof.

13. The method of claim 1 , wherein the carbon source solution is further doped with ferrous sulfate.

14. The method of claim 1 , wherein the waste incineration fly ash is a biochemically-, physically- or chemically-treated fly ash.

15. The method of claim 1 , wherein COPR is a chromium-containing soil or a chromium-containing waste.

16. The method of claim 1 , wherein an internal-electrolysis ceramsite of the internal-electrolysis ceramsite layer is a Fe-C internal-electrolysis ceramsite containing metallic iron and a carbon material.

Assignees

• Univ Qingdao Technology
• Qingdao Jiehua Environmental Tech Co Ltd

Inventors

• Zhang Dalei
• Zhao Jianxue

Classifications

• B09B3/65 Primary

  Anaerobic treatment · CPC title

• B09B3/70

  Chemical treatment, e.g. pH adjustment or oxidation (involving an extraction step B09B3/80) · CPC title

• F23J1/00

  Removing ash, clinker, or slag from combustion chambers ({removing flyash from flue gas F23J15/022;} devices for removal of material from the bed of fluidised bed combustion apparatus F23C10/24) · CPC title

• Y02P10/20

  Recycling · CPC title

• F23J2700/003

  Ash removal means for incinerators · CPC title