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Supersonic wave reinforcement sludge anaerobic digestion gas production method

An anaerobic digestion and ultrasonic technology, applied in biological sludge treatment, waste fuel and other directions, to achieve the effect of low energy consumption, promoting the utilization of sludge resources and increasing the total amount

Inactive Publication Date: 2007-08-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems existing in the present situation of sludge disposal, and proposes a technique of using ultrasonic waves to strengthen anaerobic digestion of sludge to produce gas

Method used

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  • Supersonic wave reinforcement sludge anaerobic digestion gas production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An urban sewage treatment plant in Shenzhen adopts the activated sludge method for treatment, and the properties of the concentrated sludge are as follows:

[0026]

[0027] After all the sludge entering the anaerobic digestion tank is treated with 80kHz, 0.075W / ml ultrasonic waves, the final gas production of the sludge is as follows:

[0028] time / s

[0029] Through the large-scale application of the sewage treatment plant, the ultrasonic wave can significantly promote the gas production of the anaerobic digestion of the sludge, and it can also control the foam effect of the sludge very well, which has the prospect of large-scale application.

Embodiment 2

[0031] An urban sewage treatment plant in Harbin adopts the activated sludge method for treatment, and the properties of the concentrated sludge are as follows:

[0032]

Moisture content (%)

pH value

suspended solids

(mg / L)

Volatile Suspended Solids

(mg / L)

dissolved organic matter

(mg / L)

96.97

6.72

5206

4117

1840

[0033] 80% of the sludge entering the anaerobic digestion tank is subjected to 40kHz, 1.000W / ml ultrasonic treatment, and then mixed with the remaining sludge for anaerobic digestion. The final gas production is as follows:

[0034] time / s

Embodiment 3

[0036] An urban sewage treatment plant in Beijing adopts the activated sludge method for treatment, and the properties of the concentrated sludge are as follows:

[0037]

Moisture content (%)

pH value

suspended solids

(mg / L)

Volatile Suspended Solids

(mg / L)

dissolved organic matter

(mg / L)

97.03

6.69

5074

4001

1769

[0038] 50% of the sludge entering the anaerobic digestion tank is mixed with the remaining sludge for anaerobic digestion after applying 25kHz, 1.500W / ml ultrasonic treatment, and the final gas production is as follows:

[0039] time / s

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Abstract

The invention discloses a manufacturing method through hypersonic reinforced sludge anaerobic digestive method, which is characterized by the following: condensing sludge; breaking cell wall structure through extreme condition of cavitation effect; increasing sobule organic material; pumping sludge through sludge pump after a while; digesting under anaerobic condition; purifying methane; making digestive sludge into sludge dehydrating system to obtain dried sludge to do terminal disposal.

Description

technical field [0001] The invention relates to a method for improving the properties of solid waste and utilizing the solid waste for energy recovery and utilization, and belongs to the technical field of solid waste treatment. Background technique [0002] Sludge from urban domestic sewage plants is composed of organic debris, bacterial cells, colloids, various microorganisms, and organic and inorganic particles. It contains 90% to 99% of water, and 1% to 10% of solid content, of which The content is 50% to 60%. Sludge contains a large amount of perishable substances, nutrients such as nitrogen and phosphorus, and a small amount of heavy metals such as cadmium, copper, and mercury. It must be properly disposed of, otherwise it will cause serious pollution to the environment. With the improvement of urban domestic sewage treatment rate, its sludge output is also increasing day by day. At present, the sludge discharge of urban sewage treatment plants in my country is about ...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 蒋建国张群芳杜雪娟
Owner TSINGHUA UNIV
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