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Method for enhancing co-digestion of kitchen waste and activated sludge to produce acid through freezing/temperature pretreatment

A technology for kitchen waste and activated sludge, which is applied in the direction of temperature control sludge treatment, biological sludge treatment, fermentation, etc., can solve the problems of ecological pollution and large-scale discharge of kitchen waste.

Pending Publication Date: 2022-07-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This invention is a method to increase the content of VFA, which can be used as a carbon source in the subsequent sewage treatment process or for the production of pHA, which solves serious problems such as large-scale discharge of kitchen waste and ecological pollution, and has certain research significance

Method used

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  • Method for enhancing co-digestion of kitchen waste and activated sludge to produce acid through freezing/temperature pretreatment
  • Method for enhancing co-digestion of kitchen waste and activated sludge to produce acid through freezing/temperature pretreatment
  • Method for enhancing co-digestion of kitchen waste and activated sludge to produce acid through freezing/temperature pretreatment

Examples

Experimental program
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Effect test

example 1

[0030] (1) Pulverization and mixing of kitchen waste and activated sludge: First, screen the kitchen waste to remove bones, paper and plastic, and then use an electric mixer to pulverize to a kitchen waste slurry with a particle size of less than 2 mm; Dilute to a total solid content of 10%; dilute the activated sludge from the sewage biological treatment system to a total solid content of 10%; divide the above-mentioned treated kitchen waste slurry and activated sludge according to volume 1:

[0031] 1 Mix evenly;

[0032] (2) Pretreatment of the mixed solution: the mixed solution of the above-mentioned kitchen waste slurry and activated sludge was frozen at -20°C for 24 hours, and returned to room temperature of 20°C after freezing; 2 The air at the top of the mixed solution was blown off for 10 minutes, and the original air in the device was exhausted; the mixed solution after the above treatment was placed at 35°C for anaerobic fermentation for 18 days.

[0033] (3) Take 20...

example 2

[0039] (1) Pulverization and mixing of kitchen waste and activated sludge: First, screen the kitchen waste to remove bones, paper and plastic, and then use an electric mixer to pulverize to a kitchen waste slurry with a particle size of less than 2 mm; Dilute to a total solid content of 10%; dilute the activated sludge from the sewage biological treatment system to a total solid content of 10%; divide the above-mentioned treated kitchen waste slurry and activated sludge according to volume 1:

[0040] 1 Mix evenly;

[0041] (2) Pretreatment of the mixed solution: the mixed solution of the above-mentioned kitchen waste slurry and activated sludge was frozen at -20°C for 24 hours, and returned to room temperature of 20°C after freezing; 2 The air at the top of the mixed solution was blown off for 10 min, and the original air in the device was exhausted; the mixed solution after the above treatment was placed at 55 °C for anaerobic fermentation for 18 d.

[0042] (3) Take 20ml o...

example 3

[0047] (1) Pulverization and mixing of kitchen waste and activated sludge: First, screen the kitchen waste to remove bones, paper and plastic, and then use an electric mixer to pulverize to a kitchen waste slurry with a particle size of less than 2 mm; Dilute to a total solid content of 10%; dilute the activated sludge from the sewage biological treatment system to a total solid content of 10%; divide the above-mentioned treated kitchen waste slurry and activated sludge according to volume 1:

[0048] 1 Mix evenly;

[0049] (2) Pretreatment of the mixed solution: The mixed solution of the above-mentioned kitchen waste slurry and activated sludge was frozen at -20°C for 36 hours, and returned to room temperature of 20°C after freezing; 2 The air at the top of the mixed solution was blown off for 10 minutes, and the original air in the device was exhausted; the mixed solution after the above treatment was placed at 35°C for anaerobic fermentation for 18 days.

[0050] (3) Take ...

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Abstract

The invention discloses a method for enhancing co-digestion of kitchen waste and activated sludge to produce acid through freezing / temperature pretreatment, and belongs to the field of organic solid waste resource utilization. The method can be used for the subsequent treatment process of domestic sewage and industrial wastewater. The invention provides a method for enhancing co-digestion acid production of kitchen waste and activated sludge by utilizing freezing temperature pretreatment for the first time. The activity among microorganisms in the fermentation process can be improved by selecting a proper temperature, and the sludge fermentation efficiency is improved. The EPS structure can be cracked at high temperature to release more organic matters into a liquid phase, but the high temperature can kill more digestive bacteria to influence the activity of enzymes in microorganisms, so that the sludge fermentation process is inhibited. The fermentation under the high-temperature condition belongs to butyric acid type fermentation and is mainly used for generating more butyric acid; compared with the prior art, the medium-temperature condition is more beneficial to sludge fermentation and acid production, most fermentation microorganisms are suitable for survival under the medium-temperature condition, the medium-temperature condition can accelerate the process of converting butyric acid into other acids, and the fermentation under the medium-temperature condition belongs to mixed acid type fermentation so as to mainly generate mixed acid.

Description

technical field [0001] The invention relates to a method for strengthening the co-digestion of kitchen waste and activated sludge to produce acid by freezing / temperature pretreatment, belongs to the field of resource utilization of organic solid waste, and can be used in the subsequent treatment process of domestic sewage and industrial waste water. Background technique [0002] With the continuous advancement of science and technology, the population continues to increase, and a large amount of fossil fuels are used in the field of power generation, which will cause resource shortages. Although fossil fuels have brought certain benefits to human beings, they have increased global greenhouse gas emissions. Therefore, renewable energy has become one of the main topics of concern. In 2020, the European Union (EU) adopted a new circular economy action plan, which aims to prepare the European economy for a green future. The value of waste is an important aspect in the concept ...

Claims

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Application Information

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IPC IPC(8): C12P7/52C12P7/54C12P7/40C12P7/625C02F11/04C02F11/20
CPCC12P7/52C12P7/54C12P7/40C12P7/625C02F11/04C02F11/20
Inventor 曾薇刘炳成苗豪豪彭永臻
Owner BEIJING UNIV OF TECH
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