Anaerobic fermentation system and method for producing biogas by carrying out sludge digestion reaction through anaerobic fermentation system

Abstract

The invention relates to the technical field of waste treatment and in particular relates to an anaerobic fermentation system and a method for producing biogas by carrying out a sludge digestion reaction through the anaerobic fermentation system. The anaerobic fermentation system comprises a fermentation tank, wherein the fermentation tank is of a sealed structure, and a horizontal stirring device is arranged inside the fermentation tank; a feeding end and a discharging end are respectively arranged at two ends of the fermentation tank in the horizontal direction; a biogas pipe is arranged on the top of the fermentation tank; a feeding hole is formed in the top, which is close to the feeding end, of the fermentation tank; the feeding hole is respectively connected with a feeding screw conveying device and a sludge conveying pipeline; a device for stirring and mixing the materials is arranged below the feeding hole and inside the fermentation tank; a discharge opening is formed in the discharging end and is connected with the screw conveying device; a return pipeline is arranged on one side of the discharging end; and the other end of the return pipeline is connected with the feeding end. The system has the advantages of small size, reasonable design, continuous operation and the like.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to an anaerobic fermentation system and a method for generating biogas by utilizing the system for sludge digestion. Background technique [0002] At present, the sludge disposal methods in the world generally include agricultural use, landfill, throwing into the sea, incineration, etc. Sludge landfill and throwing into the sea mainly. However, the sludge agricultural method occupies a large area, it is difficult to select a site, and the management is complicated. Odor may be generated, and there are certain requirements for heavy metals, pathogenic bacteria and other harmful substances. Although the sludge landfill method is easier to manage, it uses less sludge as a resource and pollutes the landfill soil to a certain extent. The treatment cost of the sludge incineration method is high, and the gas produced after incineration will cause certain pollution to the atmosphe...

AI Technical Summary

Problems solved by technology

The solid content of wet fermentation is less than 15%. The fermentation material is a flowing liquid, which is convenient for transporting materials through pipelines. The biogas production is the most sufficient, the material is fermented evenly, and it is easy to realize continuous feeding and discharging. However, wet fermentation must first crush solid organic waste into pulp , and there are problems such as scum and sediment in the wet process

The total solid content of dry fermentation raw materials is about ≥ 20%, the material is solid, the volume is large, the decomposition of organic matter is uneven, and it is difficult to realize continuous feeding and discharging

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