Method for producing methane and preparing fertilizer simultaneously

A technology for preparing fertilizers and producing methane, which is applied to the preparation of organic fertilizers, organic fertilizers, and excretion fertilizers. It can solve the problems of large differences in nutrient content of fermentation products, slow reaction start-up speed, and low nutrient content in effective states. Concentration ammonia inhibits fermentation and organic acid accumulation problems, improves composition and structure, increases porosity and specific surface area

Active Publication Date: 2017-02-15
SHANGHAI ACAD OF AGRI SCI +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] Although dry methane fermentation has many advantages in treating solid waste, due to the high content of TS, the solid waste in the fermenter exists in the form of immobile solid, which has great heterogeneity, which will lead to slow reaction start-up speed and production. The gas efficiency is low; and the nutrient content of the final fermentation product (biogas residue) varies greatly, and the available nutrient content is low

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  • Method for producing methane and preparing fertilizer simultaneously
  • Method for producing methane and preparing fertilizer simultaneously

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Mix 8.16 kg of pig manure and 1.84 kg of straw to obtain a mixed material, the solid content of the mixed material is 27.0%, the VS is 19.3%, and the C / N is 20;

[0038] (2) Mix 1kg of rice straw charcoal obtained by carbonization at 300°C with 10kg of the above mixture, place it in a 20L anaerobic fermentation tank, and feed nitrogen into the anaerobic fermentation tank for 10 minutes to exhaust the headspace of the reactor The air ensures an anaerobic environment for the reaction, and the fermentation temperature is 55°C;

[0039] Using the above treatment method, during the continuous culture process of dry methane fermentation, the average methane volume concentration in the biogas produced within 50 days was analyzed every 1 to 5 days, and the biogas residue samples were collected to analyze the water-soluble nitrogen and phosphorus content, pH value and EC value. The results are shown in Table 2. Among them, the methane volume concentration data analyzed ever...

Embodiment 2

[0041](1) Mix 8.16 kg of pig manure and 1.84 kg of straw to obtain a mixed material, the solid content of the mixed material is 27.0%, the VS is 19.3%, and the C / N is 20;

[0042] (2) Mix 1 kg of rice straw charcoal obtained by carbonization at 500 °C with the above 10 kg mixture, place it in a 20L anaerobic fermentation tank, and feed nitrogen into the anaerobic fermentation tank for 10 minutes to exhaust the head space of the reactor The air ensures an anaerobic environment for the reaction, and the fermentation temperature is 55°C;

[0043] Using the above treatment method, during the continuous culture process of dry methane fermentation, the average methane volume concentration in the biogas produced within 50 days was analyzed every 1 to 5 days, and the biogas residue samples were collected to analyze the water-soluble nitrogen and phosphorus content, pH value and EC value. The results are shown in Table 2. The results showed that during the 50-day fermentation process,...

Embodiment 3

[0045] (1) Mix 8.16 kg of pig manure and 1.84 kg of straw to obtain a mixed material, the solid content of the mixed material is 27.0%, the VS is 19.3%, and the C / N is 20;

[0046] (2) Mix 1kg of rice straw charcoal obtained by carbonization at 700°C with the above 10kg mixture, place it in a 20L anaerobic fermentation tank, and feed nitrogen into the anaerobic fermentation tank for 10 minutes to exhaust the head space of the reactor The air ensures an anaerobic environment for the reaction, and the fermentation temperature is 55°C;

[0047] Using the above treatment method, during the continuous culture process of dry methane fermentation, the average methane volume concentration in the biogas produced within 50 days was analyzed every 1 to 5 days, and the biogas residue samples were collected to analyze the water-soluble nitrogen and phosphorus content, pH value and EC value. The results are shown in Table 2. The results show that during the 50-day fermentation process, the...

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Abstract

The invention discloses a method for producing methane and preparing a fertilizer simultaneously. The method comprises the following steps: (1) mixing excrement and urine of beasts and birds and crop straw at the weight ratio of (3.5-4.5):1, thus obtaining a mixed material; and (2) mixing rice straw charcoal or rice husk charcoal with the mixed material at the weight ratio of (0.5-2.5):10, placing the obtained mixture in an anaerobic fermentation tank, and carrying out fermentation. With the adoption of the method provided by the invention, the gas dredging and medium delivery generated in a reaction matrix can be effectively improved, the utilization efficiency of microbes for the matrix can be improved, and meanwhile, the high-quality fertilizer is produced.

Description

technical field [0001] The invention belongs to the field of agricultural fermentation, and specifically relates to a method for simultaneously producing methane and preparing fertilizer by adding rice stalk charcoal or rice husk charcoal from an external source. Background technique [0002] Biogas production by anaerobic fermentation is an important direction for resource utilization of agricultural waste. According to the total solid content (TS) of materials, it can be divided into dry fermentation, semi-dry fermentation and wet fermentation. Among them, the anaerobic fermentation with a material concentration below 15% is wet anaerobic fermentation. This technology consumes a lot of clean water, the concentration of the product after fermentation is low, the dehydration treatment is difficult, and the fermentation product is difficult to effectively use when processing solid waste. Problems restrict the widespread promotion and application of this technology. Anaerobic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04C05F15/00C05F17/00
CPCC05F3/00C12P5/023C05F11/00C05F17/00Y02E50/30Y02W30/40
Inventor 张继宁周胜陈桂发孙会峰邹国燕
Owner SHANGHAI ACAD OF AGRI SCI
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