Continuous dry digestion device and processing method for wastes

Abstract

The invention discloses a continuous dry digestion device for wastes. The continuous digestion device comprises a reactor, wherein a compound stirring system is arranged in the reaction cavity of thereactor; the compound stirring system comprises a stirring shaft; a plurality of flat-paddle type stirring paddles are distributed on the stirring shaft along an axial direction, and two adjacent flat-paddle type stirring paddles are distributed along opposite directions; a paddle is fixedly arranged between two adjacent flat-paddle type stirring paddles; the vane of the paddle extends along the axial direction of the stirring shaft and forms an included angle with the stirring shaft. Through the dry digestion of microbial fermentation, the operation cost of a dry digestion process can be greatly lowered, and in addition, digestion reaction can be accelerated so as to be favorable for improving the yield of methane. The invention also discloses a continuous dry digestion method for wastes.

Description

technical field [0001] The invention relates to a waste treatment device, in particular to a waste continuous dry digestion device. The invention also relates to a waste continuous dry digestion treatment method. Background technique [0002] The excessive development and utilization of fossil energy has caused environmental pollution and global warming, and renewable energy has attracted widespread attention from all over the world. Garbage is known as a misplaced resource, and according to "Renewable Energy Information 2018: An Overview" published by the International Energy Agency in 2018, renewable municipal waste accounted for 0.9% of the world's renewable energy supply in 2016 and 0.9% of the world's renewable energy supply in 2017. 2.9% of the country's renewable energy supply, accounting for 1.2% of OECD countries' renewable energy generation in 2017, reaching an annual growth rate of 5.3%. [0003] In 2016 alone, the volume of municipal solid waste removal in Chin...

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Problems solved by technology

[0004] The second type is sanitary landfill; its disadvantage is that the construction of landfill covers a large area and the waste of land resources is serious;

[0006] The fourth type is composting; its disadvantage is that the composting of organic components in domestic waste after classification will cause the enrichment of heavy metal elements in the soil, which will affect the planting of crops and human health

[0010] 1. The existing dry digestion process is intermittent operation, and the loading and unloading labor intensity is high (CN101177693A, CN102174591A, CN102174595A);

[0011] 2. The existing dry digestion process lacks process integration, and there are still many fermentation residues in the waste dry digestion process, which need further treatment

Although the patent documents CN102260019A, CA1026745546A, CN85202346U, CN201962120U, and CN2908481Y also use fermentation processes at both ends to process waste, these processes use water washing to transfer the organic acid produced in the first stage to the second stage. Divided into two sections, the process is more complicated, and a large amount of waste water will be generated at the same time

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