Dry and wet combined digestion treatment method for livestock manure and straw

A technology for livestock manure and digestion treatment, which is applied in the directions of combined biological treatment, biological organic part treatment, and preparation of organic fertilizers, can solve the problems of large water consumption, difficulty in feeding and discharging materials, single raw materials, etc., and achieves a reduction in the total solid content. , to ensure normal operation and improve the effect of gas production efficiency

Active Publication Date: 2015-02-18
NANJING AGRI MECHANIZATION INST MIN OF AGRI
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method has the following problems: the raw material is single, and the fermentation process is not suitable for the diversity of raw materials; and the water consumption is large, and the biogas slurry and residue generated by the reaction need to be treated twice; Preprocessing requirements are relatively high
However, the disadvantages of this treatment method are: difficult stirring, resulting in poor mass and heat transfer, low gas production rate, and difficult to achieve continuous feed

Method used

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  • Dry and wet combined digestion treatment method for livestock manure and straw

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Comparison scheme
Effect test

Embodiment 1

[0042] The method of dry-wet combined digestion of poultry manure and stalks in this embodiment is carried out according to the following steps:

[0043] 1) Solid-liquid separation:

[0044] The cow dung is separated from the solid and liquid by the spiral solid-liquid separation equipment, and finally the solid residue and the separation liquid with a moisture content of 40% to 50% are obtained, and the separation liquid flows into the pretreatment tank; the obtained solid residue is sent to the organic fertilizer production line, Made into organic fertilizer.

[0045] 2) Wet anaerobic digestion:

[0046]The wet anaerobic digestion device used in the present invention is a CSTR reactor, and a liquid sampling port is left in the middle of the CSTR reactor. Add 30% inoculum (biogas slurry produced after anaerobic fermentation of livestock and poultry manure) in the pretreatment tank and then stir, and then transfer the obtained mixture of the separated liquid and the inoculum...

Embodiment 2

[0061] The remainder of the method for treating poultry manure and stalks by combined dry-wet digestion in this embodiment is the same as in Embodiment 1, except that:

[0062] The C / N ratio of the first mixed material obtained in the above step 3) is 25:1.

[0063] In the above step 4), in the material preparation stage before the dry aerobic digestion, the water content of the second mixed material is 60%; during the dry aerobic digestion process, the oxygen supply and ventilation volume of the blast device is 3m 3 / min, the flow rate of the first leachate is 4m 3 / min, reflux mist spray once a day, 30min each time, ambient daily average temperature 10°C, aerobic digestion for 5 days to generate aerobic digestion products.

[0064] In the above step 4), in the material preparation stage before the dry anaerobic digestion, the water content of the third mixed material is 75%; during the dry anaerobic digestion process, the pressure in the dry digestion device is maintained a...

Embodiment 3

[0068] The remainder of the method for treating poultry manure and stalks by combined dry-wet digestion in this embodiment is the same as in Embodiment 1, except that:

[0069] The C / N ratio of the first mixed material obtained in the above step 3) is 20:1.

[0070] In the above step 4), in the material preparation stage before the dry aerobic digestion, the water content of the second mixed material is 55%; during the dry aerobic digestion process, the oxygen supply and ventilation volume of the blast device is 2m 3 / min, the flow rate of the first leachate is 2m 3 / min, reflux mist spray once a day, 20min each time, ambient daily average temperature 25°C, aerobic digestion for 3 days to generate aerobic digestion products.

[0071] In the above step 4), in the material preparation stage before the dry anaerobic digestion, the water content of the third mixed material is 70%; during the dry anaerobic digestion process, the pressure in the dry digestion device is maintained a...

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Abstract

The invention relates to a dry and wet combined digestion treatment method for livestock manure and straw. The method mainly comprises steps as follows: mixing a separation liquid after separation of cow dung with an inoculum, and performing wet anaerobic digestion on the mixture to produce first biogas and a digestion liquid; mixing and turning the straw and the livestock manure except the cow dung to obtain a first mixed material, mixing the first mixed material with the digestion liquid to obtain a second mixed material, and performing dry digestion treatment on the second mixed material to produce second biogas, biogas slurry and biogas residues; collecting and feeding the first biogas and the second biogas into a power generating set after desulfurization and dehydration; feeding the biogas residues into an organic fertilizer production line, and recovering the biogas slurry to the dry anaerobic digestion process for recycling. According to the method, dry and wet combined digestion is adopted, dry aerobic digestion is performed before dry anaerobic digestion, meanwhile, backflow of leachate is performed, mutual contact and actions among the material, microbes and moisture are enhanced, and the problems of crusting of materials, thickening of fermentation broths and difficulty in mass and heat transfer during dry fermentation are solved.

Description

technical field [0001] The invention relates to a method for processing organic waste from agriculture and animal husbandry, in particular to a method for combined dry-wet digestion using poultry manure and straw as raw materials, and belongs to the technical field of agricultural and animal husbandry waste treatment. Background technique [0002] With the tremendous development of the rural economy, farmers began to gradually change the traditional way of energy consumption and fertilizer use in production, making the problem of excess agricultural waste increasingly prominent and becoming an important source of pollution to the ecological environment. The degree of harmless treatment of domestic garbage and livestock and poultry manure is very low, and the phenomenon of on-site stacking is serious; the comprehensive utilization rate of agricultural waste (such as straw) is not high, and random incineration and random abandonment are common. This has caused serious pollutio...

Claims

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Application Information

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IPC IPC(8): C05F17/00C05F15/00C12P5/02
CPCC05F3/00C05F17/10C05F17/50C12P5/023C05F11/00Y02E50/30Y02W30/40
Inventor 曲浩丽陈永生朱德文王鹏军陈明江韩柏和曹杰李瑞容
Owner NANJING AGRI MECHANIZATION INST MIN OF AGRI
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