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Biogas residue thermal cracking solid product and application method thereof

A thermal cracking and biogas residue technology, applied in waste fuel, fermentation, etc., can solve the problems of difficult disposal, high sludge moisture content, limited application, etc., reduce the harm of ammonia nitrogen and organic acid poisoning, and improve anaerobic digestion Efficiency, the effect of improving growth metabolic rate

Inactive Publication Date: 2016-04-20
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high water content and organic matter content of sludge, it is easy to rot and smell, which makes the sludge treatment cost high and difficult to dispose of.
In 2010, the output of wet sludge from urban sewage treatment in the country was more than 20 million tons. However, only about 20% of the sludge was harmlessly treated and utilized as a resource. A large amount of sludge was not properly treated, which endangered the ecology. surroundings
However, the traditional combined anaerobic digestion process has a long reaction cycle, and there are also unfavorable factors such as high organic acid and high ammonia nitrogen, which inhibit anaerobic digestion and cause low methane conversion rate, which limits the application of combined anaerobic digestion technology in sludge. Disposing of applications
In order to improve the efficiency of sludge anaerobic digestion, invention patent application CN104529106A and invention patent application CN102838262A proposed a method for promoting the addition of copper sulfate or ferrate production waste liquid, and invention patent application CN104261644A disclosed electrolytic pretreatment of circulating sludge and raw However, these methods are not conducive to large-scale application in production due to the disadvantages of high cost or high energy consumption

Method used

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  • Biogas residue thermal cracking solid product and application method thereof
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  • Biogas residue thermal cracking solid product and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The sludge obtained from a sewage plant and the collected garden waste (thatched grass) were combined anaerobic digestion at 35°C, and part of the biogas residue produced was dehydrated by pressure filtration. Under hydrothermal conditions (200°C, 1.1MPa, 1 hour) The material precursor is prepared under high temperature, followed by thermal cracking under the condition of 500°C with limited oxygen, and the obtained solid product is pulverized and sieved, and the particle size is controlled between 0.2-5mm. The remaining sludge from anaerobic digestion was used as inoculum sludge.

[0037] Analyze the specific surface area and porosity of the thermally cracked solid product, and observe the microstructure through the scanning electron microscope image of the thermally cracked solid product, such as figure 1 Shown; Determination of the Fourier transform infrared spectrum of the thermally cracked solid product, such as figure 2 shown.

[0038] From figure 1 It can be s...

Embodiment 2

[0042] The solid product of biogas residue pyrolysis obtained in Example 1 was mixed with the inoculation sludge at a mass ratio of 1:2, and cultured at 35°C for 24 hours to enhance the activity of inoculation microorganisms to prepare enhanced inoculation sludge for future use.

[0043] Put the sludge and garden waste into the anaerobic digestion reactor, and at the same time add the solid product of biogas residue pyrolysis obtained in Example 1, and inoculate the enhanced inoculation sludge, and carry out anaerobic digestion under medium temperature conditions (35°C). The solid product of biogas residue pyrolysis accounted for 1% of the total solid content in the anaerobic digestion system, and the enhanced inoculated sludge accounted for 2% of the total solid content in the anaerobic digestion system. The experimental results showed that compared with the anaerobic digestion system only inoculated with conventional inoculated sludge, the introduction of solid products from ...

Embodiment 3

[0045] The solid product of biogas residue pyrolysis obtained in Example 1 was mixed with the inoculated sludge at a mass ratio of 1:1, and cultured at 35°C for 24 hours to enhance the activity of inoculated microorganisms to prepare enhanced inoculated sludge for future use.

[0046] Put the sludge and garden waste into the anaerobic digestion reactor, and at the same time add the solid product of biogas residue pyrolysis obtained in Example 1, and inoculate the enhanced inoculation sludge, and carry out anaerobic digestion under medium temperature conditions (35°C). The solid products of biogas residue pyrolysis accounted for 2% of the total solid content in the anaerobic digestion system, and the enhanced inoculated sludge accounted for 2% of the total solid content in the anaerobic digestion system. The experimental results showed that compared with the anaerobic digestion system only inoculated with conventional inoculated sludge, the introduction of solid products from bi...

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Abstract

The invention relates to a biogas residue thermal cracking solid product and an application method thereof. The application method comprises the steps that combined anaerobic digestion treatment is performed on sludge and garden waste, and part of obtained biogas residues are treated through press-filter dewatering and then prepared into material precursors under the hydrothermal condition; thermal cracking is performed on the material precursors, and products are smashed and screened through a sieve to obtain particles; the particles are mixed with inoculating sludge, the activity of inoculated microorganisms is enhanced, enhanced-type inoculating sludge is prepared, and the obtained enhanced-type inoculating sludge and the particles obtained through smashing and screening are reused in the anaerobic digestion treatment process. Accordingly, the methane generating efficiency in the combined anaerobic digestion process of the sludge and the garden waste is improved, the anaerobic digestion time is shortened, the waste treatment efficiency is improved, the waste utilization value is increased, and a green and environment-friendly novel municipal solid waste treatment and reclamation method is achieved.

Description

technical field [0001] The invention relates to the field of urban organic solid waste disposal and resource utilization, in particular to a solid product of biogas residue pyrolysis and an application method thereof. Background technique [0002] With the substantial increase in the number of urban sewage plants and the volume of sewage treatment in my country, the output of sludge has also increased. Due to the high water content and organic matter content of sludge, it is easy to rot and smell, which makes the sludge treatment cost high and difficult to dispose of. In 2010, the output of wet sludge from urban sewage treatment in the country was more than 20 million tons. However, only about 20% of the sludge was harmlessly treated and utilized as a resource. A large amount of sludge was not properly treated, which endangered the ecology. environment. [0003] Among the various disposal methods of sludge, anaerobic digestion technology plays an increasingly important rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 张又弛孙健蔡超
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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