# US 11,298,732 B2 · Method for co-processing of waste incineration fly ash and chromium slag in landfill

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- Number: US 11,298,732 B2
- Document ID: US11298732B2
- Status: Granted
- Kind: B2
- Application number: 16/722,818
- Filed: 2019-12-20
- Published: 2021-08-12
- Granted: 2022-04-12
- Earliest claimed: 2017-06-20
- Assignees: Qingdao University of Technology; Qingdao Jiehua Environmental Technology Co., Ltd.
- Applicants: Qingdao University of Technology; Qingdao Jiehua Environmental Technology Co., Ltd.
- Inventors: Dalei Zhang; Jianxue Zhao
- Web page: https://patentgrep.com/patent/US11298732B2

## CPC

- B09B 1/00: Dumping solid waste
- B09B 3/65: Anaerobic treatment
- B09B 3/70: Chemical treatment, e.g. pH adjustment or oxidation (involving an extraction step B09B3/80)
- C02F 1/4672: {by electrooxydation}
- B09B 2101/30: Incineration ashes
- C02F 2001/46185: {only anodic or acidic water, e.g. for oxidizing or sterilizing}
- C02F 2101/22: Chromium or chromium compounds, e.g. chromates
- C02F 2103/06: Contaminated groundwater or leachate
- C02F 2103/16: from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
- C02F 2305/026: Fenton's reagent
- Y02P 10/20: Recycling
- B09B: DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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).

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 6)

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

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 9)

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

### Claim 11 (depends on 9)

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.

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

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

### Claim 14 (depends on 1)

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

### Claim 15 (depends on 1)

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

### Claim 16 (depends on 1)

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.