Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials

A technology of simultaneous fermentation and synergy, applied in fermentation, waste fuel, biological sludge treatment, etc., to achieve the effect of strong stability and good buffer capacity

Active Publication Date: 2012-07-11
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to be able to provide a method for improving the performance of anaerobic gas production through the synergistic effect of multi-raw material near-synchronous fermentation. The near-synchronous fermentation of ra

Method used

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  • Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials
  • Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials
  • Method for improving methane-producing performance under synergistic action of mixed quasi-synchronous fermentation of multiple raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Gas production performance of mixed anaerobic digestion of pretreated corn stalks and chicken manure in different proportions

[0042] 1) Corn stalks are crushed to 1-5 cm by a straw grinder, mixed with 2% (mass concentration) NaOH solution (the amount of NaOH added is 2% of the dry weight of corn stalks) for pretreatment, and the treatment time is 3 days;

[0043] 2) The crushed and pretreated corn stalks described in step 1 and the chicken manure after removing impurities are used according to the dry matter mass ratio (dry matter refers to the matter after subtracting moisture from fresh raw materials) 1:0, 1:1, 1:2 , 2: 1, 0: 1 ratio (wherein 1: 0 and 0: 1 are respectively pure corn stalks and pure chicken manure) fully mixed;

[0044] 3) Put the mixed substance obtained in step 2 into a 2L conical flask anaerobic digestion reactor, add inoculated sludge (this sludge is taken from Nanwu Biogas Station, Shunyi Suburb, Beijing), fully mix, and inoculate sludge Adding...

Embodiment 2

[0052] Gas production performance of mixed anaerobic digestion of pretreated wheat straw and cow dung in different proportions

[0053] 1) The wheat straw is crushed to 1-5 cm by a pulverizer and then mixed with 2% (mass concentration) NaOH solution (the amount of NaOH added is 2% of the dry weight of the straw) for pretreatment, and the treatment time is 3 days;

[0054] 2) the pulverized and pretreated wheat straw and cow dung described in step 1 are in the mass ratio of dry matter (dry matter refers to the material after subtracting moisture from the fresh raw material) 1:0, 1:6, 1:1, 6:1, The ratio of 0:1 (wherein 1:0 and 0:1 are pure wheat straw and pure cow dung respectively) is fully mixed;

[0055] 3) Put the mixed substance obtained in step 2 into a 2L conical flask anaerobic digestion reactor, add inoculated sludge (this sludge is taken from Nanwu Biogas Station, Shunyi Suburb, Beijing), fully mix, and inoculate sludge Adding amount is 10000~20000mg / L (mass in TS), ...

Embodiment 3

[0061] Gas production performance of mixed anaerobic digestion of human manure and pretreated wheat straw in different proportions

[0062] 1) Wheat straw is crushed to 3-5 cm by a pulverizer and then mixed with 2% (mass concentration) NaOH solution (the amount of NaOH added is 2% of the dry weight of the straw) for pretreatment, and the treatment time is 3 days;

[0063] 2) The human feces and the pulverized and pretreated wheat straw described in step 1 are 1:0, 2.75:1, 1.13 according to the mass ratio of volatile dry matter (volatile dry matter refers to the material after subtracting moisture and ash from fresh raw materials) : 1, 0.4: 1, 0: 1 ratio (1: 0 and 0: 1 are pure human manure and pure wheat straw respectively) and mix thoroughly, the C / N ratio after mixing is the optimal ratio for anaerobic digestion ;

[0064]3) Put the mixed substance obtained in step 2 into the 2L conical flask anaerobic digestion reactor, add inoculation sludge (this sludge is taken from Bei...

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Abstract

The invention belongs to the field of treatment of organic solid wastes, and discloses a method for improving anaerobic gas-producing performance under the synergistic action of the mixed quasi-synchronous fermentation of multiple raw materials. By the method, organic wastes (straw, domestic garbage, excrement and the like) are subjected to the quasi-synchronous fermentation of multiple raw materials, namely the organic wastes are pretreated, so that the fermentation period of materials (such as the straw and the like) with a long fermentation period is shortened and is close to an average fermentation period of the mixed materials; the fermentation period of materials (such as garbage in restaurants and kitchens, excrement and the like) which are easy to digest is prolonged appropriate; and the pretreated materials are mixed, inoculated and subjected to anaerobic digestion to produce methane, so that the methane-producing period of the materials with the anaerobic digestion period is synchronous with that of the materials with the short anaerobic digestion period to realize the quasi-synchronous fermentation of the materials. The method is simple and high in operability; and by the method, two and more than two organic solid wastes are treated simultaneously, and the accumulative methane yield of unit volatile solid (VS) substances is improved by 15 to 60 percent averagely.

Description

technical field [0001] The invention belongs to the field of organic solid waste treatment, and specifically relates to a method for improving anaerobic gas production performance through the synergistic effect of multi-raw material mixing and near-synchronous fermentation Background technique [0002] my country is the country with the largest output of organic solid waste in the world, among which more than 700 million tons of straw, more than 3 billion tons of livestock and poultry manure are produced every year, and more than 100 million tons of fruit and vegetable waste are discarded every year, and only Beijing The daily output of kitchen waste has reached 1700t. Single use of straw as fermentation raw material, high carbon-nitrogen ratio of straw, high cellulose content, lack of nutrient elements, can not meet the requirements of normal anaerobic fermentation, the starting time of raw material anaerobic fermentation is long, the digestion cycle is long, and the degrada...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 李秀金冯亚君袁海荣高健邹德勋朱保宁任鹏刘茹飞
Owner BEIJING UNIV OF CHEM TECH
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