Synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste

Patent metadata

Field	Value
Publication number	US-12515976-B2
Application number	US-202318229829-A
Country	US
Kind code	B2
Filing date	Aug 3, 2023
Priority date	Aug 3, 2023
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste is provided, and relates to the technical field of kitchen waste treatment. Main structures of the synergistic device include a pretreatment system, a centrifuge, a flocculation/flotation tank, an anaerobic fermentation tank, an anaerobic ammoniation system, an OAO system and an electrocatalytic ozone synergistic treatment system which are connected in sequence.

First claim

What is claimed is:

1 . A synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste, comprising a pretreatment system, a centrifuge, a flocculation/flotation tank, an anaerobic fermentation tank, an anaerobic ammoniation system, an OAO (Oxic Anoxic Oxic) system and an electrocatalytic ozone synergistic treatment system which are communicated in sequence,
wherein the pretreatment system is used for carrying out sorting, crushing, dewatering and solid-liquid separation of kitchen waste; the centrifuge is used for further separating liquid treated by the pretreatment system: the flocculation/flotation tank is used for removing suspended matters and microbubbles from the liquid treated by the centrifuge: the anaerobic fermentation tank is used for removing organic matters in the liquid: the anaerobic ammoniation system is used for removing ammonia nitrogen and total nitrogen in the liquid: the OAO system is used for removing COD (Chemical Oxygen Demand) in the liquid and carrying out denitrification and sludge-water separation; and the electrocatalytic ozone synergistic treatment system is used for rapidly degrading the organic matters in the liquid and removing the COD so as to enable waste water to reach a discharge standard.

2 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 1 , wherein the pretreatment system comprises a receiving hopper, a sorting machine, a crushing filter press and a three-phase separator which are connected in sequence: the receiving hopper is used for receiving the kitchen waste, the sorting machine is used for carrying out coarse sorting of the kitchen waste, the crushing filter press is used for crushing and dewatering the kitchen waste, and the three-phase separator is used for separating water, grease and solid matters from the kitchen waste; and a water outlet of the three-phase separator is communicated with the centrifuge.

3 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 2 , further comprising an aerobic degradation tank, and a filter residue outlet of the crushing filter press and a solid matter outlet of the three-phase separator are respectively communicated with the aerobic degradation tank.

4 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 3 , wherein a biogas outlet of the anaerobic fermentation tank is communicated with a biogas purification system, a filter residue outlet of the anaerobic fermentation tank is communicated with a biogas residue dehydrator, the biogas residue dehydrator is communicated with the aerobic degradation tank, and a filtrate outlet of the biogas residue dehydrator is communicated with the anaerobic ammoniation system.

5 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 4 , wherein a slag outlet of the biogas purification system is communicated with the receiving hopper.

6 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 4 , wherein the biogas purification system comprises a two-stage desulfurization equipment having a wet desulfurization equipment and a dry desulfurization equipment connected in series, the wet desulfurization equipment adopts processes of alkali spray and biological reaction recovery, and the dry desulfurization equipment adopts an iron oxide process for desulfurization: in case sulfur content is high, the sulfur content is reduced by the wet desulfurization equipment, and then desulfurization effect and stability are ensured by the dry desulfurization equipment; and in case the sulfur content is low, the dry desulfurization equipment is adopted without adopting the wet desulfurization equipment.

7 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 4 , wherein the anaerobic fermentation tank is a mechanically stirred CSTR (Continuous Stirred Tank Reactor) anaerobic reactor.

8 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 1 , wherein the anaerobic ammoniation system comprises an anaerobic ammonia oxidation tank and a primary sedimentation tank which are communicated in sequence, the anaerobic ammonia oxidation tank is communicated with the anaerobic fermentation tank, and the primary sedimentation tank is communicated with the OAO system.

9 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 1 , wherein the OAO system comprises an aeration tank, a secondary sedimentation tank, an A/O (Anoxic/Oxic) tank and a tertiary sedimentation tank which are arranged in sequence; the aeration tank is communicated with the anaerobic ammoniation system, and the tertiary sedimentation tank is communicated with the electrocatalytic ozone synergistic treatment system.

10 . The synergistic device for resource and energy recovery, pollution reduction and carbon reduction of kitchen waste according to claim 1 , further comprising a grease storage tank, wherein the grease storage tank is used for collecting grease separated by the pretreatment system and the centrifuge.

Assignees

• Univ Beijing Jiaotong

Inventors

• Yao Hong
• Cheng Shuqi
• Sun Shaobin

Classifications

• C02F9/00

  Multistage treatment of water, waste water or sewage · CPC title

• C02F1/78

  with ozone {(C02F1/4672 takes precedence)} · CPC title

• C02F1/463

  by electrocoagulation · CPC title

• C02F2303/24

  Separation of coarse particles, e.g. by using sieves or screens · CPC title

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title