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Method for mixed fermentation of sludge disintegrated by low-strength ultrasonic wave and crop straws pretreated by fermentation broth and application of method

A technology of crop straw and mixed fermentation, which is applied in the direction of biological sludge treatment, fermentation, waste fuel, etc., can solve the problems of increased construction and operation costs, long hydraulic retention time, and large volume of sludge digestion structures, so as to shorten the anaerobic Effects of digestion time, increased disposal levels, and improved mesophilic anaerobic digestion performance

Active Publication Date: 2013-11-27
TIANJIN UNIV
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  • Summary
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  • Claims
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Problems solved by technology

However, since the cellulose contained in the straw is a refractory organic matter, and the cell wall in the sludge protects the cells from osmotic lysis, the anaerobic digestion of the mixed straw and sludge requires a long hydraulic retention time, generally 20-30 days ( d, 24 hours a day), which resulted in a huge volume of sludge digestion structures, increasing construction and operating costs

Method used

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  • Method for mixed fermentation of sludge disintegrated by low-strength ultrasonic wave and crop straws pretreated by fermentation broth and application of method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh the corn stalk powder, pass it through a 20-mesh sieve, and fully mix the corn stalk powder and fermentation liquid according to the solid-liquid ratio of 1:10 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treated in the straw pretreatment pool for 8h. TCOD in the liquid phase increased by 3000mg / L after pretreatment

[0020] The sludge with a solid content of 2wt% is transported by a sludge pump to a multi-probe ultrasonic processor (6) for cracking. The frequency of the ultrasonic reactor is 20kHz, the diameter of the probe is 20mm, and the acoustic energy density is 0.5kW / m 3 , the cracking time is 3 minutes. After cracking, the TCOD in the sludge liquid phase increased by 2000mg / L.

[0021] 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 is fed into the hydrolysis acidification, the hydraulic retention time is 24h, and the ...

Embodiment 2

[0023] Weigh the wheat straw powder, pass it through a 30-mesh sieve, and fully mix the wheat straw powder and fermentation liquid according to the solid-liquid ratio of 1:15 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treat in the straw pretreatment pool for 36h. After pretreatment, TCOD in the liquid phase increased by 10000mg / L

[0024] 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 2.5%, and the cracking time is 10 minutes. After cracking, the TCOD in the sludge liquid phase increased by 5000mg / L.

[0025] After the pretreatment, the wet wheat straw and the sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:1.8), and the mixture is fed into hydrolytic acidification, the hydraulic retent...

Embodiment 3

[0027] The rice straw powder is weighed, passed through a 30-mesh sieve, and the rice straw powder and fermentation liquid are fully mixed according to a solid-to-liquid ratio of 1:20 (mass ratio), so as to ensure that the straw is soaked in the acidic fermentation liquid. Treat in the straw pretreatment pool for 15h. TCOD in the liquid phase increased by 5483mg / L after pretreatment

[0028] The sludge is transported by the sludge pump to the multi-probe ultrasonic processor for cracking. The frequency of the ultrasonic reactor is 40kHz, the diameter of the probe is 30mm, and the sound energy density is 0.78kW / m 3 , the solid content of the sludge is 4%, and the cracking time is 8 minutes. After cracking, the TCOD in the sludge liquid phase increased by 3780mg / L.

[0029] After pretreatment, the wet rice straw and sludge enter the mixing tank to be fully mixed (the mixing mass ratio is 1:2.1), and the mixture is fed into the hydrolysis acidification, the hydraulic retention ...

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Abstract

The invention discloses a method for mixed fermentation of sludge disintegrated by low-strength ultrasonic wave and crop straws pretreated by fermentation broth and application of the method in improving mesophilic two-phase anaerobic digestion. The method comprises the following steps: mixing the sludge and the straw to perform hydrolytic acidification, wherein the sludge is pretreated by the low-strength ultrasonic wave; refluxing the straws with the hydrolytic acidified fermentation broth after the sludge and the straw are mixed; and mixing the straws treated by the fermentation broth with the sludge again, and performing hydrolytic acidification. The method provided by the invention improves mesophilic two-phase anaerobic digestion performance of the sludge, increases the gas yield and stability of the sludge, and shortens the anaerobic digestion time.

Description

technical field [0001] The invention belongs to the field of sludge treatment and disposal and biomass energy utilization, more specifically, relates to a sludge treatment and disposal method and crop straw energy utilization technology, in particular to a low-intensity ultrasonic cracked sludge and fermentation liquid pretreatment The invention discloses a method for processing crop stalks for mixed fermentation. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 王芬季民王拓
Owner TIANJIN UNIV
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