Continuous dry digestion device and processing method for wastes

A waste and dry technology, applied in biochemical cleaning devices, biochemical equipment and methods, biomass post-processing, etc. Element enrichment and other problems, to avoid the use of a large amount of water, reduce operating costs, and relieve the effect of inhibition

Inactive Publication Date: 2019-02-12
RES INST OF ZHEJIANG UNIV TAIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Continuous dry digestion device and processing method for wastes

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Example 1: Microbial anaerobic treatment of kitchen waste to produce biogas

[0072] First, the collected kitchen waste is squeezed to remove most of the water, and then input into the reactor through the deep bucket feed hopper 1; the anaerobic activated sludge is input into the reactor through the strain injection port 2, and in the reactor with 5kg of extruded kitchen waste is fully mixed by a compound mixing system. The dry weight ratio of activated sludge to kitchen waste is 2:1. The reaction is carried out in a reactor with a fermentation temperature of 37°C and a fermentation time of 18 days. The pressure is normal pressure; the fermentation product is separated to produce 502.3 liters of biogas, which is discharged through the biogas outlet 4, and the reaction residue is discharged through the tailing outlet 3.

Embodiment 2

[0073] Example 2: Anaerobic fermentation of municipal waste organic components to produce biogas

[0074] The anaerobic activated sludge is mixed with the pulverized urban refuse organic components, and is input into the reactor through a deep bucket feed hopper 1; the amount of the urban refuse organic components is 10kg, and the anaerobic activated sludge and the municipal refuse organic components The ratio is 3:1; in the reactor, it is mixed evenly by the compound stirring system, the fermentation temperature is 37°C, the fermentation time is 38 days, the fermentation pressure is normal pressure, the fermentation product is separated, the collected gas volume is 2050L, and the gas is discharged through the biogas outlet 4 Discharge, finally obtain the dry weight of the fermentation product with a mass of 7.7kg, realize volume reduction, and the reaction residue is discharged through the tailing discharge port 3.

Embodiment 3

[0075] Example 3: Mixed solid-state fermentation of kitchen waste and municipal solid waste

[0076] First, squeeze the collected kitchen waste to remove most of the water, mix the squeezed kitchen waste and municipal solid waste evenly in a ratio of 1:1 in the mixing tank, and input them through the deep bucket feeding hopper 1 Reactor; fully mix the anaerobic activated sludge with the above-mentioned organic mixture, and stir through the composite stirring system, so that the microbial catalyst and the 10kg extruded kitchen waste and domestic waste mixture are stirred evenly, the stirring speed is 30 rpm, and the stirring The direction is to stir clockwise for 3 hours, stop for 5 hours, and counterclockwise for 3 hours, and so forth; ferment in the reactor, the fermentation temperature is 30°C, the fermentation time is 20 days, the pressure of the fermentation is normal pressure, and the fermentation product is separated. The fermentation gas is collected and discharged thro...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/107C12M1/02C12M1/00
CPCC12M21/04C12M27/02C12M43/08
Inventor 李望良丁锦建丁佳敏朱慧萍
Owner RES INST OF ZHEJIANG UNIV TAIZHOU
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