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Method for performing mixed fermentation on low-intensity ultrasonically disintegrated sludge and crop straws and application of method in improving mesophilic anaerobic digestion

A crop straw and mixed fermentation technology, applied in sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problems of large volume of sludge digestion structures, long hydraulic retention time, increased construction and operation costs, etc. Achieve significant social and economic benefits, improve disposal levels, and reduce sludge production

Inactive Publication Date: 2012-07-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cell wall in the sludge protects the cells from osmotic lysis, resulting in a longer hydraulic retention time for mixed anaerobic digestion of sludge, generally 20-30d days (d, 24h a day), which results in sludge digestion structures Huge volume increases construction and operating costs

Method used

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  • Method for performing mixed fermentation on low-intensity ultrasonically disintegrated sludge and crop straws and application of method in improving mesophilic anaerobic digestion
  • Method for performing mixed fermentation on low-intensity ultrasonically disintegrated sludge and crop straws and application of method in improving mesophilic anaerobic digestion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh the corn stalk powder, pass through a 50-mesh sieve, fully mix the corn stalk powder and tap water according to the solid-to-liquid ratio of 1:10 (mass ratio), to ensure that the straw is soaked in the tap water. Treat in the straw pretreatment pool for 12h. TCOD in the liquid phase increased by 2000mg / L after pretreatment

[0019] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 20kHz, the diameter of the probe is 20mm, and the sound energy density is 0.2kW / m 3 , the solid content of the sludge is 2.3%, and the cracking time is 3 minutes. After cracking, the TCOD in the sludge liquid phase increased by 1000mg / L.

[0020] After pretreatment, the wet corn stalks and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.4), and the mixture enters the mesophilic anaerobic digestion tank for reaction, and the hydraulic retention time is 200h. The ...

Embodiment 2

[0022] Weigh the wheat straw powder, pass through a 20-mesh sieve, fully mix the wheat straw powder and tap water according to the solid-to-liquid ratio of 1:12 (mass ratio), to ensure that the straw is soaked in the tap water. Treat in the straw pretreatment pool for 20h. After pretreatment, TCOD in the liquid phase increased by 2511mg / L

[0023] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 28kHz, the diameter of the probe is 25mm, and the sound energy density is 0.5kW / m 3 , the solid content of the sludge is 2.1%, and the cracking time is 8 minutes. After cracking, TCOD in the sludge liquid phase increased by 1742mg / L.

[0024] After pretreatment, the wet wheat straw and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.6), and the mixture enters the mesophilic anaerobic digestion tank for reaction, and the hydraulic retention time is 216h. The c...

Embodiment 3

[0026] The sorghum straw powder was weighed, passed through a 20-mesh sieve, and the sorghum straw powder was fully mixed with tap water at a solid-to-liquid ratio of 1:15 (mass ratio) to ensure that the straw was soaked in the tap water. Treat in the straw pretreatment pool for 40h. After pretreatment, TCOD in the liquid phase increased by 3217mg / L

[0027] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 28kHz, the diameter of the probe is 25mm, and the sound energy density is 0.8kW / m 3 , the solid content of the sludge is 2.4%, and the cracking time is 10 minutes. After cracking, TCOD in the sludge liquid phase increased by 2327mg / L.

[0028] After pretreatment, wet sorghum stalks and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.8), and the mixture enters the mesophilic anaerobic digester for reaction, and the hydraulic retention time is 288h. ...

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Abstract

The invention discloses a method for performing mixed fermentation on low-intensity ultrasonically disintegrated sludge and crop straws and application of the method in improving mesophilic anaerobic digestion. The mixed fermentation is performed on the sludge and the crop straws, wherein the sludge is pretreated by low-intensity ultrasonic waves, and the straws are soaked by tap water in a pretreatment pool. The technical scheme provided by the invention is that the mesophilic anaerobic digestion performance of the sludge is improved, the gas output and the stability of the sludge are increased, and the anaerobic digestion time is shortened.

Description

technical field [0001] The invention belongs to the field of sludge treatment and disposal and utilization of biomass energy, more specifically relates to a sludge treatment and disposal method and crop straw energy utilization technology, in particular to a mixed fermentation of sludge and crop straw after low-intensity ultrasonic cracking A method for improving the effect of mesophilic anaerobic digestion. Background technique [0002] As a biological treatment process, activated sludge treatment of sewage is widely used in urban sewage plants and industrial sewage plants. In recent years, the number of urban sewage plants has been increasing, and the excess sludge produced in the process of activated sludge treatment of sewage has grown rapidly. In 2010 alone, more than 6 million tons of dry sludge were produced. If the sludge is not effectively treated and disposed of, it will lead to a series of environmental problems. The sludge disposal in our country is still in a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/00
CPCY02E50/343Y02E50/30
Inventor 王芬季民王拓
Owner TIANJIN UNIV
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