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Method for producing methane in anaerobic digestion by pretreating sludge through steam explosion

An anaerobic digestion and pretreatment technology, which is applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problem that sludge pretreatment cannot be directly applied, municipal sludge has complex components, and pretreatment is difficult and other issues, to achieve the effect of improving biodegradability, improving utilization rate, and broad economic significance

Inactive Publication Date: 2013-06-26
BIOGAS SCI RES INST MIN OF AGRI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, steam explosion technology is mainly used for the treatment of solid materials with low water content, while the water content of conventional municipal sludge is 95%-99%. If steam explosion technology is used for treatment, the main energy consumption is in the heating of water, so the existing Steam explosion method cannot be directly applied to sludge pretreatment
However, the dehydrated municipal sludge has complex components, and the pretreatment is very difficult, so there is no report on the use of steam explosion as a pretreatment method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method of anaerobic digestion of steam explosion pretreatment sludge is to add 5‰ SDS (sodium dodecylsulfonate) to the dewatered sludge with a moisture content of 76.2% according to the mass ratio and mix it evenly, and then fill it with gas In the explosion tank, the saturated water vapor with a water content of 2% is introduced, the temperature is raised to 200°C, and the pressure is increased to 1MPa. Maintain the pressure for 5 minutes, open the discharge valve, and instantly depressurize and release the sludge that has been treated by gas explosion. Take part of the sludge treated by gas explosion, add inoculum according to its mass ratio of 50%, and add water to adjust the TS concentration to 3%. Add Zn: 8ppm, Mn: 8ppm, Co: 1ppm, Ni: 1ppm, FeSO 4 : 0.5‰. After mixing evenly, it was fermented at 35°C for 30 days, and the raw material gas production rate of the sludge after gas explosion was measured to be 17.8ml / g·TS. Under the same conditions, the raw mater...

Embodiment 2

[0030] The method of anaerobic digestion of steam explosion pretreatment sludge to produce gas is to add 6‰ SDS (sodium dodecylsulfonate) to the dewatered sludge with a moisture content of 76.2% according to the mass ratio and mix it evenly, and then fill it with gas In the explosion tank, the saturated water vapor with a water content of 2% is introduced, the temperature is raised to 200°C, and the pressure is increased to 1.2MPa. Maintain the pressure for 8 minutes, open the discharge valve, and instantly depressurize and release the sludge that has been treated by gas explosion. Take part of the sludge treated by gas explosion, add inoculum according to its mass ratio of 50%, and add water to adjust the TS concentration to 3%. Add Zn: 8ppm, Mn: 8ppm, Co: 1ppm, Ni: 1ppm, FeSO 4: 0.5‰. After mixing evenly, it was fermented at 35°C for 30 days, and the raw material gas production rate of the sludge after gas explosion was measured to be 22.4ml / g·TS. Under the same condi...

Embodiment 3

[0032] The method of anaerobic digestion of steam explosion pretreatment sludge is to add 8‰ SDS (sodium dodecylsulfonate) to the dewatered sludge with a moisture content of 76.2% according to the mass ratio and mix evenly, and then fill it with gas In the explosion tank, the saturated water vapor with a water content of 2% is introduced, the temperature is raised to 200°C, and the pressure is increased to 1.4MPa. Maintain the pressure for 10 minutes, open the discharge valve, and instantly depressurize and release the sludge that has been treated by gas explosion. Take part of the sludge treated by gas explosion, add inoculum according to its mass ratio of 50%, and add water to adjust the TS concentration to 3%. Add Zn: 8ppm, Mn: 8ppm, Co: 1ppm, Ni: 1ppm, FeSO 4 : 0.5‰. After mixing evenly, it was fermented at 35°C for 30 days, and the raw material gas production rate of the sludge after gas explosion was measured to be 25.8ml / g·TS. Under the same conditions, the raw m...

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Abstract

The invention discloses a method for producing methane in anaerobic digestion by pretreating sludge through steam explosion. The method comprises the following steps of: (1) steam explosion pretreatment: to be specific, adding dehydrated sludge with 55%-85% of moisture content to 0.5-1% SDS (Sodium Dodecyl Sulfate) according to mass ratio, then putting into a gas explosion machine, feeding saturated steam with moisture content of 1%-2%, maintaining needed temperature and pressure for 2-10min, and opening an emptying valve of the gas explosion machine for collecting materials; and (2) inoculated fermentation: to be specific, adding inoculums to the preprocessed material, wherein the inoculum quantiy accounts for 3%-50% of the mass of the material, sealing and fermenting after uniformly stirring. The method has the advantages of being capable of improving the biodegradability of sludge, being beneficial to degradation of microorganisms and increasing the utilization rate and gas output of sludge.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for pretreating municipal sludge by using steam explosion technology to improve biogas production in anaerobic digestion. Background technique [0002] With the increasingly serious problem of environmental protection, more and more cities have built sewage plants to treat residents' domestic sewage. Municipal sludge is a by-product of sewage treatment, and its output is 1% to 2% of the sewage treatment volume. my country's urban sewage treatment plants discharge about 300,000 tons of dry sludge every year, and it is also growing at a rate of about 10% per year. Municipal sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc., and contains organic matter, nutrients such as nitrogen, phosphorus, and potassium, and heavy metals such as Ni, Pb, Cr, Cu, and Zn. element. If it is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 尹晓波李强刘越朱能敏唐烈唐续坤郑军强
Owner BIOGAS SCI RES INST MIN OF AGRI
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