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Method for promoting anaerobic digestion of municipal sludge with high solid content to produce methane by using zero-valent iron

An anaerobic digestion, zero-valent iron technology, applied in biological sludge treatment and other directions, can solve the problems of decreased gas production, system stability damage, excessive organic load, etc., and achieves simple operation, low operating cost, and low energy demand. Effect

Inactive Publication Date: 2020-05-05
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is also prone to excessive organic load in the anaerobic system, the reproduction rate of acid-producing bacteria exceeds that of methanogenic bacteria, a large amount of organic acid produced in a short period of time is difficult to be consumed by methanogenic bacteria, acid-base imbalance in anaerobic system, and system stability damage , a sharp drop in gas production, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The sludge is taken from the sludge of the secondary settling tank of the sewage plant (solid content rate is 1.5%, pH is 7.0, temperature is 4°C), and a low-speed centrifuge is used to remove part of the water in the sludge, and water is added to adjust the solid content of the sludge to 3% into a 500mL anaerobic reaction bottle, and then add 10mL of seed sludge and 1500mg / L of zero-valent iron powder with a particle size of 38μm in the anaerobic reaction bottle. 2 After blowing off for 5 minutes, the oxygen in the reaction bottle was evacuated and then sealed into the air collection bag. The anaerobic reaction bottle was placed in a constant temperature water bath shaker, the shaker speed was set to 120r / min, the water bath temperature was 35°C, and the reaction was carried out for 16 days. Samples were taken every two days, and the concentration of methane in the gas phase was determined by gas chromatography. The gas chromatograph uses a TCD detector, and the opera...

Embodiment 2

[0031] The sludge is taken from the sludge of the secondary settling tank of the sewage plant (solid content rate is 1.5%, pH is 7.0, temperature is 4°C), and a low-speed centrifuge is used to remove part of the water in the sludge, and water is added to adjust the solid content of the sludge to 5% into an anaerobic reaction bottle with a specification of 500mL, and then add 10mL of seed sludge and 1500mg / L of zero-valent iron powder with a particle size of 38μm in the anaerobic reaction bottle. 2 After blowing off for 5 minutes, the oxygen in the reaction bottle was evacuated and then sealed into the air collection bag. The anaerobic reaction bottle was placed in a constant temperature water bath shaker, the shaker speed was set to 120r / min, the water bath temperature was 35°C, and the reaction was carried out for 16 days. Samples were taken every two days, and the concentration of methane in the gas phase was determined by gas chromatography. The gas chromatograph uses a TC...

Embodiment 3

[0034] The sludge is taken from the sludge of the secondary settling tank of the sewage plant (solid content rate is 1.5%, pH is 7.00, temperature is 4°C), and a low-speed centrifuge is used to remove part of the water in the sludge, and water is added to adjust the solid content of the sludge to 7% into an anaerobic reaction bottle with a specification of 500mL, and then add 10mL of seed sludge and 1500mg / L of zero-valent iron powder with a particle size of 38μm in the anaerobic reaction bottle. 2 After blowing off for 5 minutes, the oxygen in the reaction bottle was evacuated and then sealed into the air collection bag. The anaerobic reaction bottle was placed in a constant temperature water bath shaker, the shaker speed was set to 120r / min, the water bath temperature was 55°C, and the anaerobic digestion reaction was carried out for 16 days. Samples were taken every two days, and the concentration of methane in the gas phase was determined by gas chromatography. The gas ch...

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Abstract

The invention belongs to the technical field of solid waste treatment and disposal, and discloses a method for promoting anaerobic digestion of municipal sludge with high solid content to produce methane by using zero-valent iron. Specifically, after the solid content of sludge is adjusted, the sludge is mixed with an inoculum and zero-valent iron to obtain a mixture, and then the mixture is placed in an oxygen-free environment to be subjected to a digestion reaction to generate gas. Zero-valent iron is added into an anaerobic digestion system and can be used as an electron donor to enhance the fracture of unsaturated chemical bonds of organic matters and promote hydrolytic acidification of sludge; and hydrogen can be generated through reaction with hydrogen ions, excessive accumulation oforganic acid is avoided, and acid-base balance of the system can be effectively maintained. Besides, ferrous ions dissolved out of the zero-valent iron are important elements required by anaerobic microorganisms, are also important components of enzymes, and can stimulate and improve the activity of the anaerobic microorganisms. The method is low in energy demand, low in biogas residue yield, easy in treatment, simple to operate, low in operation cost and free of secondary pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and disposal, and particularly relates to a method for zero-valent iron to promote anaerobic digestion of high-solid urban sludge to produce methane. Background technique [0002] Currently, more than 80% of the world's energy consumption depends on fossil energy. Excessive dependence on it will not only cause the rapid depletion of non-renewable natural resources, but also bring about environmental problems such as air pollution and global warming. Therefore, the development of second-generation biomass energy using organic waste such as municipal sludge as raw materials has gradually become a research hotspot. [0003] Anaerobic digestion refers to the conversion of biodegradable organic matter in waste into CH under the action of anaerobic microorganisms 4 , CO 2 It has the characteristics of greatly reducing organic matter and generating renewable energy. It has been widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04
Inventor 石明岩吴佳玲王绍铸黎明辉尹梓菁刘建宏
Owner GUANGZHOU UNIVERSITY
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