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Process for producing biogas by two-stage anaerobic fermentation of crop stalk or livestock excrement

A technology for crop straw and livestock and poultry manure, which is applied in the directions of fermentation, microorganism-based methods, microorganisms, etc., can solve the problems of inoculum of crop straws being difficult to obtain, increase processing costs, and low gas production rate, and achieve the promotion of resource utilization. , Low cost input, the effect of improving gas production rate

Inactive Publication Date: 2010-10-13
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above patents have their own characteristics, but there are still some deficiencies when they are applied to the anaerobic fermentation of crop straws to produce biogas, mainly reflected in: (1) The inoculum of crop straws is not easy to obtain, such as activated sludge, which generally needs to be obtained from sewage treatment plants , difficult to obtain in rural areas
Livestock and poultry manure is a large and easy-to-obtain raw material in rural areas; (2) In the process of anaerobic fermentation of straw, it is necessary to add chemicals, such as using solid alkali to adjust the pH value, which increases the cost of treatment
(3) The crop straw is not pretreated, or aerobic pretreatment is adopted, so that the reaction time of the anaerobic fermentation of the crop straw is longer and the gas production rate is lower

Method used

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  • Process for producing biogas by two-stage anaerobic fermentation of crop stalk or livestock excrement
  • Process for producing biogas by two-stage anaerobic fermentation of crop stalk or livestock excrement
  • Process for producing biogas by two-stage anaerobic fermentation of crop stalk or livestock excrement

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Effect test

Embodiment 1

[0026] The process for producing biogas by two-stage anaerobic fermentation of crop straw and livestock and poultry manure in the laboratory is characterized in that it includes the following steps:

[0027] (1) Ingredients

[0028] 10 grams of corn stalks, 15 grams of dry chicken manure, 15 grams of dry cow manure, 30 grams of water;

[0029] (2) Prepare and mix materials

[0030] Prepare 10 grams of corn stalks crushed to a particle size of 2 mm, 30 grams of a mixture of dry chicken manure and dry cow manure, and mix them uniformly with 30 grams of water;

[0031] (3) Acidification stage reaction

[0032] Add 70 grams of the above-mentioned mixed materials into a 500-milliliter conical flask every day, and carry out acidification reaction at a constant temperature of 25°C in a water bath, adjust the pH value between 4.6-5.0, and generate an acidification section after the residence time is 48 hours. material, start to discharge 70 g / day continuously;

[0033] (4) Acidifi...

Embodiment 2

[0042] In Dajuge Village, Jixian County, Tianjin City, a two-stage anaerobic fermentation biogas production process of crop straw and livestock manure was used to treat rural organic waste. figure 1 ) and an anaerobic digester of 8 cubic meters underground (see figure 2 ), the acidification tank and the anaerobic digester are all cement structures. The lower part of the acidification tank is located below the ground level 14, and is provided with a feed inlet 11, a thermal insulation cover plate 12, and a discharge outlet 13. The tank wall 15 is a cement-sealed thermal insulation layer, and the bottom of the tank is provided with a gravel layer 16 and a drain pipe 17. The anaerobic biogas digester is constructed according to the "GB / T4750-2002 Household Biogas Digester Standard Atlas". The top of the pond is flush with the ground level 25, and has a sealing cover 21, a material inlet 22, a biogas outlet 23, and a material outlet 24. The pool body 26 is set as a cement sealin...

Embodiment 2-1

[0045] (1) Ingredients

[0046] 15 kg of corn stalks with a particle size of 10 mm, 15 kg of dry pig manure, 15 kg of dry sheep manure, and 45 kg of water

[0047] (2) Prepare and mix materials

[0048] Prepare 15 kg of corn stalks crushed to a particle size of 10 mm, 30 kg of a mixture of dry pig manure and dry sheep manure, and mix them evenly with 45 kg of water. 3 ;

[0049] (3-1) Start of acidification section

[0050] According to the above proportion of ingredients, feed the uniformly mixed material to the 4 / 5 of the volume of the acidification tank at one time, stay for 7 days, the pH of the acidification tank is stable between 4.5-6, the start-up process is completed, and start to continuously feed and discharge materials;

[0051] (3-2) Acidification stage reaction

[0052] Mix the homogeneous material at 0.15m 3 Put it into the acidification tank every day, the temperature of the acidification section is 25-30°C, and the material is discharged after a residence t...

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Abstract

The invention relates to a process for producing biogas by the two-stage anaerobic fermentation of crop stalks or livestock excrement, which is characterized by comprising the following steps: a raw material preparation step, in which 1 to 2 mass parts of crop stalks with a particle diameter of 2 to 10 millimeters, 2 to 3 mass parts (on a dry basis) of livestock excrement and 2 to 3 parts of water are prepared; an acidification step, in which the temperature is 20 to 30 DEG C, the pH value is 4.5 to 6 and the retention period is 48 to 60 hours; a step of adding water into the discharged material of the acidification step to adjust a solid content to 15 to 20 percent; an anaerobic fermentation step, in which the temperature is 40 to 50 DEG C, the pH value is 6.8 to 7.2 and the retention period is 6 to 8 days; and a step of material discharge and sorting treatment. The process has the advantages of improving the utilization rate of the crop stalks in an anaerobic fermentation process, reducing the reaction time for the anaerobic fermentation, improving gas production rate, fully utilizing livestock excrement, promoting the recycling of rural organic waste, controlling overall source pollution in rural areas and improving the sanitation and environment of the rural areas.

Description

technical field [0001] The invention relates to the field of rural renewable energy utilization and environmental protection, in particular to a two-stage anaerobic fermentation biogas production process of crop straw and livestock manure. Background technique [0002] The resource utilization of rural crop straw and livestock and poultry manure organic waste can effectively control rural non-point source pollution and improve the rural sanitation environment. Biogas production by anaerobic fermentation is one of the traditional resource utilization methods of livestock and poultry manure in rural areas in my country. The anaerobic fermentation process is a biochemical process consisting of an acidogenic stage and a methanogenic stage. However, at present, most of the biogas digesters in rural areas of our country adopt a one-stage type, that is, the stages of acid production and methane production are combined into one and completed in the same reactor. Because the charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12R1/01
CPCY02E50/343Y02E50/30
Inventor 马建立卢学强邓小文周滨陈红袁雪竹张良运焦永杰
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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