Method and device for comprehensively processing pig dung in large-scale pig farm

Abstract

The invention discloses a method and a device for comprehensively processing pig manure in a large-scale pig farm. The method for comprehensively processing pig dung in the large-scale pig farm comprises the following steps: S1, the pig dung in pig houses is collected by a mechanical dung scraping facility, and is transported into a dung collecting tank; S2, the pig dung in the dung collecting tank is added into a fermentation tower by a screw conveyor, undergoes anaerobic dry fermentation to produce biogas, and then undergoes aerobic composting; S3, the biogas generated in the anaerobic dryfermentation process is introduced into and stored in a gas storage cabinet, odorous gas generated during the aerobic composting is introduced into a biological filter and is processed, the above produced organic fertilizer is transported to a curing workshop and is cured, and generated biogas slurry and leachate enter an anaerobic fermentation reactor by a pump, and are used to produce biogas; and S4, the biogas obtained in step S2 and step S3 is purified, and then used, the produced organic fertilizer is returned to the field, and the generated biogas slurry is used for irrigating crops after being discharged into an oxidation pond and processed. The method and the device have the advantage of good processing effect, simple process conditions, no secondary pollution and high economic benefits.

Description

technical field [0001] The invention relates to the related technical fields of comprehensive treatment and resource utilization of livestock and poultry waste, in particular to a method and a treatment device for comprehensive treatment of pig manure in large-scale pig farms. Background technique [0002] The large-scale and intensive development of the pig breeding industry has led to a large amount of pig manure, and pig manure is actually a precious resource. After resource treatment, it can be used as anaerobic fermentation to produce biogas or converted into organic fertilizer. The goal is to achieve reduction, harmlessness and resource utilization. At present, the common treatment technologies for pig manure include anaerobic fermentation technology and composting technology. [0003] During the operation of pig manure anaerobic fermentation, there are the following problems: the organic load of the biogas tank is too high, resulting in low biogas production; the sol...

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Problems solved by technology

[0003] During the operation of pig manure anaerobic fermentation, there are the following problems: the organic load of the biogas tank is too high, resulting in low biogas production; the solid matter of pig manure will produce sedimentation or scum crusting in the biogas tank, which will affect the normal operation of the biogas tank. operation; a large amount of biogas slurry needs to be processed later, which increases the processing cost

However, aerobic composting of pig manure has a large area, long fermentation time, complicated process, and will pollute the surrounding atmospheric environment to a certain extent.

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