Kitchen waste medium-high-temperature combined anaerobic digestion equipment and anaerobic digestion method

Abstract

The invention discloses kitchen waste medium-high-temperature combined anaerobic digestion equipment and anaerobic digestion method. The equipment comprises a feeder, a drum coarse screen, a grinder, an extruder, a collection pool, a cyclone desander, a feeding buffer pool, a medium-temperature anaerobic fermentation tank, a high-temperature anaerobic fermentation tank, a centrifugal dehydrator, a sewage purification system, a vacuum drier and a biogas boiler, wherein the feeder, the drum coarse screen, the grinder, the extruder, the collection pool, the cyclone desander, the feeding buffer pool, the medium-temperature anaerobic fermentation tank, the high-temperature anaerobic fermentation tank, the centrifugal dehydrator and the sewage purification system are connected in sequence; the medium-temperature anaerobic fermentation tank and the high-temperature anaerobic fermentation tank are respectively connected with the biogas boiler; the contrifugal dehydrator is connected with the vacuum drier; the vacuum drier is connected with the biogas boiler; and the sewage purification system is connected with the collection pool. According to the kitchen waste medium-high-temperature combined anaerobic digestion equipment and anaerobic digestion method, the biogas yield can be improved, the system operation stability can be improved, and resource utilization is easy.

Description

technical field [0001] The invention belongs to the technical field of kitchen waste treatment, and relates to a kitchen waste treatment equipment, in particular to a high-temperature combined anaerobic digestion equipment for kitchen waste; at the same time, the invention also relates to the above-mentioned anaerobic digestion equipment anaerobic digestion method. Background technique [0002] Kitchen waste is the main source of organic phase in municipal solid waste, and it is generally produced in enterprises, institutions, schools, farmers' markets, supermarkets, and catering service industries. Taking Beijing, Shanghai, Guangzhou and other big cities as examples, the daily output of kitchen waste exceeds 1,000 tons. Food waste is mainly composed of organic substances such as starch, dietary fiber, and animal fat, and has the characteristics of high moisture, high fat, high salt, perishable odor, and easy biodegradation. In addition to being used to raise pigs, most of...

AI Technical Summary

Problems solved by technology

[0006] The existing methods and equipment for anaerobic digestion of kitchen waste generally use single-phase or two-phase anaerobic digestion, that is, both medium-temperature anaerobic digestion (30-40°C) or high-temperature anaerobic digestion (50-60°C) , or it needs to be mixed with sludge for joint treatment, resulting in problems such as small amount of kitchen waste treatment, poor system stability, and low biogas conversion rate. However, the biochemical properties of fermented biogas residues are poor, and the production of fertilizers is prone to contain heavy metals and other reasons. , sales are limited

Therefore, these factors have restricted the resource utilization and zero-emission treatment of kitchen waste.

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