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Mechanical grinding combined facultative anaerobic hydrolysis preprocessing method for anaerobic fermentation of straws

A technology of straw pretreatment and anaerobic fermentation, applied in fermentation, waste fuel, etc., can solve the problems of poor effect, high investment, large-scale production of secondary pollution, etc., to solve the problem of straw anaerobic fermentation encrustation, and reduce operating costs , Reduce the effect of one-time investment

Inactive Publication Date: 2017-08-08
QINGDAO TIANREN ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a mechanical pulverization combined with facultative hydrolysis pretreatment method for anaerobic fermentation of straw, which solves the problems of high investment, poor effect, secondary pollution and difficulty in large-scale production in the prior art straw pretreatment method. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A mechanical crushing combined facultative hydrolysis pretreatment method for straw anaerobic fermentation of the present invention comprises the following steps:

[0021] (1) Straw crushing, natural air-dried straw is bundled with a baler, and is generally stored in the straw yard of the biogas project; before crushing, first break the bundle and screen out impurities such as soil and stones mixed in it, and then use a straw crusher to crush to a particle size of 1 cm.

[0022] (2) Straw blending, the crushed straw is transported to the hydrolysis blending tank by a belt feeder, blended with biogas slurry after anaerobic fermentation, mixed with the inoculum by stirring with a mixer, and the feed liquid is obtained. The solid content rate is 8%.

[0023] (3) Straw hydrolysis, the prepared straw is aerobically hydrolyzed in the hydrolysis tank for 1 day, the feed liquid is heated through the heating coil in the hydrolysis tank, and the temperature is maintained at 36°C...

Embodiment 2

[0026] A mechanical crushing combined facultative hydrolysis pretreatment method for straw anaerobic fermentation of the present invention comprises the following steps:

[0027] (1) Straw crushing, natural air-dried straw is bundled with a baler, and is generally stored in the straw yard of the biogas project; before crushing, first break the bundle and screen out impurities such as soil and stones mixed in it, and then use a straw crusher to crush to a particle size of 2 cm.

[0028] (2) Straw blending, the crushed straw is transported to the hydrolysis blending tank by a belt feeder, blended with biogas slurry after anaerobic fermentation, mixed with the inoculum by stirring with a mixer, and the feed liquid is obtained. The solid content rate is 10%; the inoculum is the hydrolyzate obtained in step (3) in Example 1, and the inoculum is 1 / 4 of the volume of the entire hydrolysis tank; usually after the first hydrolysis pretreatment is completed, the hydrolysis When the liq...

Embodiment 3

[0032] A mechanical crushing combined facultative hydrolysis pretreatment method for straw anaerobic fermentation of the present invention comprises the following steps:

[0033] (1) Straw crushing, natural air-dried straw is bundled with a baler, and is generally stored in the straw yard of the biogas project; before crushing, first break the bundle and screen out impurities such as soil and stones mixed in it, and then use a straw crusher to crush to a particle size of 1.5 cm.

[0034] (2) Straw blending, the crushed straw is transported to the hydrolysis blending tank by a belt feeder, blended with biogas slurry after anaerobic fermentation, mixed with the inoculum by stirring with a mixer, and the feed liquid is obtained. The solid content rate of straw is 9%; the inoculum is the hydrolyzate obtained after the first hydrolysis pretreatment is completed, and 20% of the hydrolyzate is retained in the hydrolysis tank as the inoculum for the next straw deployment when the hydr...

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Abstract

The invention discloses a mechanical grinding combined facultative anaerobic hydrolysis preprocessing method for anaerobic fermentation of straws, and belongs to the technical field of biogas production by straw anaerobic processing. The mechanical grinding combined facultative anaerobic hydrolysis preprocessing method comprises the following steps of: 1, straw preprocessing, i.e., grinding the straws, wherein the particle size of the ground straws is 1 to 2cm; 2, straw blending, i.e., adding biogas slurry and an inoculum into the straws obtained in the step 1 so as to obtain feed liquid, wherein solid content of the feed liquid is 8 to 10%; 3, straw hydrolysis, i.e., carrying out facultative anaerobic hydrolysis on the feed liquid obtained in the step 2 for 1 to 2 days at a hydrolysis temperature of 38 plus or minus 2 DEG C, and carrying out intermittent aeration according to an aeration gas-water ratio of 6:1 to 20:1 so as to obtain hydrolysate. According to the mechanical grinding combined facultative anaerobic hydrolysis preprocessing method disclosed by the invention, the problems of straw anaerobic fermentation crusting and difficulty in feeding and discharging are effectively solved, straw anaerobic fermentation efficiency is improved; fermentation time is shortened by 10 to 20 days; by biogas slurry reflux blending, water for blending can be saved by 7 to 9 tons per ton of straws, so that one-time investment of engineering is directly reduced by 1 to 1.5 millions, and operation cost is reduced by 10 to 15%.

Description

technical field [0001] The invention belongs to the technical field of straw anaerobic biogas production, in particular to a mechanical pulverization combined with facultative hydrolysis pretreatment method for straw anaerobic fermentation. Background technique [0002] my country is a large agricultural country, and crop straw is extremely rich. According to statistics, the amount of straw resources that can be collected every year is about 900 million tons; if it is not handled in time, it will not only pollute the environment, but also cause waste of resources. In order to realize the resourceful and harmless utilization of straw, my country strongly supports the construction of large-scale large-scale biogas projects of straw, and straw biogas projects have developed rapidly. [0003] The lignin content of straw is relatively high, and the cellulose structure of straw is also very complex. There are a large number of crystalline regions, hydrogen bonds and non-crystallin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 辛静吴健敏
Owner QINGDAO TIANREN ENVIRONMENT
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