# US 8,739,709 B2 · Combined treatment process of domestic garbage and sewage

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- Number: US 8,739,709 B2
- Document ID: US8739709B2
- Status: Granted
- Kind: B2
- Application number: 13/519,269
- Filed: 2011-03-14
- Published: 2013-01-10
- Granted: 2014-06-03
- Earliest claimed: 2010-03-25
- Assignees: Hebei Building Materials Industry Design and Research Institute
- Applicants: Ying Chen
- Inventors: Ying Chen
- Web page: https://patentgrep.com/patent/US8739709B2

## CPC

- F23G 7/001: {for sludges or waste products from water treatment installations (F23G5/008 takes precedence)}
- B03B 9/06: specially adapted for refuse
- B09B 3/35: Shredding, crushing or cutting
- C02F 9/00: Multistage treatment of water, waste water or sewage
- F23G 5/02: with pretreatment
- F23G 5/033: comminuting or crushing
- F23G 5/04: drying
- C02F 1/52: by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)}
- C02F 11/10: by pyrolysis
- C02F 11/12: by de-watering, drying or thickening
- C02F 11/13: by heating
- F23G 2201/601: different calorific values
- F23G 2201/603: recyclable material
- F23G 2201/70: Blending
- F23G 2900/50214: Separating non combustible matters
- Y02E 50/10: Biofuels, e.g. bio-diesel
- Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel
- Y02W 30/52: Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- B03B: SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- 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)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A combined treatment process of domestic garbage and sewage, comprising the following steps: {circle around (1)} sorting iron out of the domestic garbage; {circle around (2)} crushing the domestic garbage in which the iron has been removed; {circle around (3)} feeding the crushed domestic garbage into a sewage treatment tank, adding water and blowing air into the sewage treatment tank, where the domestic garbage is divided into floating substances, suspended substances, and settled substances; {circle around (4)} salvaging, dehydrating and drying the floating substances and then combusting them as fuel; {circle around (5)} collecting, filtering and drying the settled substances, wherein the settled substances having a calorific value of more than 4180 kJ/kg are burnt as fuel, the burnt substances and the settled substances having a calorific value of less than 4180 kJ/kg are used to replace clay material in a cement plant or used for making bricks; {circle around (6)} adding a flocculant into the sewage in which the floating substances and the settled substances have been removed so as to make the suspended substances settle, the suspended substances which have been settled are treated according to step {circle around (5)}; and {circle around (7)} treating the sewage. The process of the present invention effectively combines the domestic garbage treatment and sewage treatment, realizing the comprehensive treatment of domestic garbage and sewage as well as efficient utilization of resources.

## Claims

### Claim 1

A combined treatment process of domestic garbage and sewage, characterized in that the process comprises the following steps:
(1) sorting iron out of the domestic garbage;
(2) crushing the domestic garbage in which the iron has been removed;
(3) feeding the crushed domestic garbage into a sewage treatment tank, adding water and blowing air into the sewage treatment tank, where the domestic garbage is divided into three layers: floating substances, suspended substances and settled substances;
(4) salvaging, dehydrating and drying the floating substances and then combusting them as fuel;
(5) collecting, filtering and drying the settled substances, wherein the settled substances having a calorific value of more than 4180 kJ/kg are burnt as fuel, the burnt substances and the settled substances having a calorific value of less than 4180 kJ/kg are used to replace clay material in a cement plant or used for making bricks;
(6) adding a flocculant into the sewage in which the floating substances and the settled substances have been removed so as to make the suspended substances settle, the suspended substances which have been settled are treated according to step (5);
(7) treating the sewage.

### Claim 2 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that the iron is sorted out by using electromagnetic technology in step (1).

### Claim 3 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that the floating substances in step (4) and the settled substances having a calorific value of more than 4180 kJ/kg in step (5), after being dried, can be burnt as fuel in a cement plant, a thermal power plant, or a combustor having a combusting temperature of more than 1200° C.

### Claim 4 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that at least one sewage treating tank is disposed in step (3).

### Claim 5 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that the dehydrating in step (4) is carried out by pressurized dehydrating, dehydrating by plate and frame filter, or centrifuging dehydrating.

### Claim 6 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that the drying in step (5) is carried out in a drying crusher or a rotary drier.

### Claim 7 (depends on 6)

The combined treatment process of domestic garbage and sewage according to claim 6, characterized in that the drying crusher or the rotary drier uses waste heat from a cement kiln or a thermal power plant for the drying.

### Claim 8 (depends on 1)

The combined treatment process of domestic garbage and sewage according to claim 1, characterized in that the domestic garbage in step (2) is crushed so as to have a particle size of not more than 10 mm.

### Claim 9

a combined treatment process of domestic garbage and sewage, characterized in that the process comprises the following steps:
(1) sorting iron out of domestic garbage;
(2) crushing the domestic garbage in which the iron has been removed;
(3) feeding the crushed domestic garbage into a sewage treatment tank, adding a substance selected from the group consisting of industrial sewage, domestic sewage, or tap water, and blowing air into the sewage treatment tank, where the domestic garbage is divided into three layers: floating substances, suspended substances and settled substances;
(4) salvaging, dehydrating and drying the floating substances and then combusting them as fuel;
(5) collecting, filtering and drying the settled substance, wherein the settled substances having a calorific value of more than 4180 kJ/kg are burnt as fuel, the burnt substances and the settled substances having a calorific value of less than 4180 kJ/kg are used to replace clay material in a cement plant or used for making bricks;
(6) adding a flocculant into the sewage in which the floating substances and the settled substances have been removed so as to make the suspended substances settle, the suspended substances which have been settled are treated according to step (5);
(7) treating the sewage.