System and process for preparing fertilizer from biogas residues and sludge

Abstract

The invention discloses a biogas residue and sludge fertilizer preparation system and process, and belongs to the technical field of environmental protection. The device comprises a biogas residue and sludge receiving system, a straw auxiliary material storage system, a mixing device and a biomass drying bin, a biogas residue and sludge inlet and a straw auxiliary material inlet are formed in the top of the mixing device, a mixture discharge port is formed in the bottom of the mixing device, the biogas residue and sludge receiving system is composed of a biogas residue transfer container, a screw pump and a conveying pipeline, and the discharge port is reserved in the bottom of the biogas residue transfer container. Biogas residue sludge is conveyed to a biogas residue sludge inlet in the top of the mixing equipment through a screw pump and a conveying pipeline. According to the method, the industrial situation that kitchen biogas residues are single in disposal and low in resource utilization rate is solved, meanwhile, organic fertilizer returning is an important link for achieving an ecological cycle system, a new way is sought for resource utilization of kitchen waste end products, environmental protection pressure is relieved, resource saving and circular economy development are promoted, and the method has a wide application prospect. The current green, environment-friendly and low-carbon development concepts are met.

Description

technical field [0001] The invention relates to a biogas residue sludge fertilizer making system and process, belonging to the technical field of environmental protection. Background technique [0002] At present, most large-scale kitchen waste disposal projects adopt the anaerobic-biogas production-power generation process route, and the biogas generator sets are used to generate electricity for the grid, so as to realize the efficient integration of resource regeneration and economic benefits. However, the anaerobic fermentation process also produces a part of 5-6% solid residue - biogas sludge. Although biogas residues are rich in nutrients such as organic matter, nitrogen, phosphorus, and potassium, and humus, they are not suitable for direct use of land due to the presence of pathogenic microorganisms, stench, and high water content in biogas residues, and are usually directly incinerated. However, its moisture content is high, its calorific value is relatively low, it...

AI Technical Summary

Problems solved by technology

However, the anaerobic fermentation process also produces a part of 5-6% solid residue - biogas sludge

Although biogas residues are rich in nutrients such as organic matter, nitrogen, phosphorus, and potassium, and humus, they are not suitable for direct use of land due to the presence of pathogenic microorganisms, stench, and high water content in biogas residues, and are usually directly incinerated. However, its moisture content is high, its calorific value is relatively low, its incineration cost is high, and it is prone to secondary pollution

This treatment method not only fails to make rational use of biogas residues, but also seriously damages the ecological environment, which no longer meets the needs of my country's current ecological development.

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