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Method for comprehensively recycling fecal sewage of large-scale livestock and poultry farms and farmland crop straws

A technology for fecal sewage and farmland crops, which is applied in the field of renewable energy development and utilization and environmental protection, can solve problems such as environmental pollution and waste of biomass resources, and achieve the effects of increasing gas production, shortening fermentation cycle, and overcoming insufficient biogas production.

Inactive Publication Date: 2011-09-07
江苏加德绿色能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current utilization, except a small amount of straw is used as livestock feed, farm manure and rural fuel, most of the straw is piled up or directly burned, which not only wastes biomass resources, but also causes serious environmental pollution problems.

Method used

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  • Method for comprehensively recycling fecal sewage of large-scale livestock and poultry farms and farmland crop straws
  • Method for comprehensively recycling fecal sewage of large-scale livestock and poultry farms and farmland crop straws

Examples

Experimental program
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Embodiment Construction

[0031] Taking the biogas project of a ten thousand dairy cow farm as an example, the specific implementation is as follows:

[0032] (1) Pretreatment: Collect cow dung and its flushing water, enter the grit chamber to remove sand at a ratio of 1:4, and adjust the pH to 6.8~7.2 through the hydrolysis and acidification tank.

[0033] (2) Anaerobic digestion: The pretreated fecal sewage is added to the anaerobic digestion tank, and the inoculum (anaerobic digestion sludge or sludge in a normal biogas digester) is added for inoculation and mixing. The amount of inoculum added is 10%~30% of the dry weight of the fermented product, adjust the total solid content TS load in the reactor (anaerobic digestion tank) at 5%~10%. The reaction temperature is controlled at 35~40°C, and the material is stirred by a stirring device during the digestion process.

[0034] (3) Biogas utilization: The generated biogas is collected by the gas cabinet, dehydrated, desulfurized and purified for power...

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Abstract

The invention relates to a method for comprehensively recycling the fecal sewage of large-scale livestock and poultry farms and farmland crop straws, which comprises the following steps of: (1) performing anaerobic digestion, namely regulating the solid content of the fecal sewage of livestock and poultry to be between 5 and 10 percent, adding anaerobic digestion inocula, and performing the anaerobic digestion to generate methane; (2) performing energy utilization on the methane, namely purifying the methane obtained in the step (1) to be used as fuel gas or allowing the purified methane to be used for power generation to perform energy utilization; (3) performing solid-liquid separation, namely performing the solid-liquid separation on biogas residues and biogas slurry which are obtainedin the step (1) to obtain the biogas slurry and the biogas residues of which the moisture content is about 60 percent; (4) preparing a biological organic compound fertilizer from the biogas slurry, and mixing the biogas residues and part of biogas slurry with the straws and part of excrement to perform aerobic compost; and (5) mixing and performing the aerobic compost, namely mixing part of biogas slurry obtained in the step (3) and the crushed straws, regulating the moisture content of the mixture to be between 50 and 60 percent, and performing the aerobic compost. In the method, clean resources are recovered by the anaerobic digestion, and the biogas slurry is used for producing the biological organic compound fertilizer with a high additional value.

Description

technical field [0001] The invention belongs to the field of renewable energy development and utilization and environmental protection, and specifically relates to a resource for anaerobic digestion of feces and sewage in large-scale livestock and poultry farms, biogas utilization, biogas slurry fertilizer, biogas residue and straw mixed aerobic composting utilization method. Background technique [0002] With the rapid development of the livestock and poultry breeding industry, large-scale and intensive livestock and poultry farms continue to increase, and the excrement emissions from breeding have increased dramatically. Livestock and poultry manure is rich in nitrogen, phosphorus, potassium and organic matter, and also contains a lot of volatile substances, pathogenic microorganisms, parasite eggs and heavy metals. If it is directly applied to farmland without treatment, it will bring harm to the ecological environment and human and animal health. to negative effect. ...

Claims

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Application Information

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IPC IPC(8): C02F3/28C05F17/00
CPCY02E50/343Y02E50/30Y02W30/40
Inventor 周楚新支银芳薛利华
Owner 江苏加德绿色能源有限公司
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