A two-stage dry digestion method and device for waste

A technology of waste and dry process, applied in the direction of biochemical cleaning equipment, biochemical equipment and methods, chemical instruments and methods, etc., to achieve high methane yield, release inhibition, improve waste conversion rate and methane yield Effect

Inactive Publication Date: 2017-07-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art, one of the objectives of the present invention is to provide a two-stage dry digestion method for waste, which is aimed at reducing or stopping the methane production rate due to the accumulation of a large amount of organic acids during the dry digestion process of waste A two-stage reaction waste treatment method with strong system controllability and continuous operation is provided to solve the problem. The method adopts the method of biological fermentation

Method used

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  • A two-stage dry digestion method and device for waste
  • A two-stage dry digestion method and device for waste
  • A two-stage dry digestion method and device for waste

Examples

Experimental program
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Embodiment 1

[0052] Example 1: Two-stage dry digestion of municipal solid waste

[0053] The two-stage anaerobic digestion reaction device adopted in this embodiment (such as figure 2 (shown) includes a rotary kiln 4 and a second-stage reactor 5 in sequence according to the material flow direction; the front end of the rotary kiln 4 is provided with a feed port 1 and a strain inlet 3 in sequence according to the material flow direction, and an alkali Reactive substance inlet 2 and rotary kiln biogas outlet 7; the furnace body of the rotary kiln 4 is fixed, and an inner shaft is arranged inside, which can drive the blades on the inner shaft to rotate; the upper part of the second-stage reactor 5 is provided with a second-stage reaction There is a biogas outlet of the device, and a methanation reaction product outlet 6 is provided at the lower part, and the methanation reaction product outlet 6 is connected to the feed port 1 .

[0054] First, classify the collected municipal solid waste, r...

Embodiment 2

[0055] Example 2: Municipal solid waste mixed with kitchen waste and two-stage dry digestion

[0056] The two-stage anaerobic digestion reaction device used in this embodiment uses two series-connected rotary kilns as the first stage dry digestion reactor (such as image 3 As shown), it includes a rotary kiln 4 and a second-stage reactor 5 in sequence according to the material flow direction; the rotary kiln 4 is divided into a first rotary kiln 41 and a second rotary kiln 42 in sequence, and the front end of the first rotary kiln 41 is provided with There is a feed port 1, the front end of the second rotary kiln 42 is provided with an alkaline substance inlet 2, and the rear end is provided with a rotary kiln biogas outlet 7; the furnace body of the first rotary kiln 41 rotates, and the furnace body of the second rotary kiln 42 Fixed, with an inner shaft inside, which drives the blades on the inner shaft to rotate; the upper part of the second-stage reactor 5 is provided with...

Embodiment 3

[0058] Example 3: Two-stage dry digestion of municipal solid waste mixed with industrial waste

[0059] The device used in this example is substantially the same as that in Example 2, with two series-connected rotary kilns as the first stage of dry digestion reactor, the difference is that the front of the first rotary kiln is provided with a strain inlet, which is located at the feed after the mouth.

[0060] Mix the screened municipal solid waste with distiller's grains in a mixing ratio of 1:1, and send 2000 kg of the mixture into the first rotary kiln 41 through the feed port 1; Concentrate, enter 1000L of microbial catalyst with a concentration of 10g / L into the first rotary kiln 41 through the strain inlet, and mix and ferment with the mixed waste through the baffle. The fermentation temperature is 37°C, the fermentation time is 10 days, and the fermentation pressure is: Under normal pressure, after detection and analysis, the fermentation output of organic acid is 0.07...

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Abstract

The present invention provides a method and a device for two-stage dry digestion of wastes. The method comprises: inoculating microorganisms in a first-stage reactor, to make waste materials fully fermented to produce acid; after acid production is finished, using alkaline substances to neutralize organic acid so as to regulate the pH value; and performing a second stage of dry fermentation to produce methane. The method can effectively overcome suppression of organic acid to a digestion process during anaerobic digestion, and does not produce a large amount of waste water because rinsing is not required.

Description

technical field [0001] The present invention relates to the field of waste treatment. Specifically, the present invention relates to a method and device for continuously treating waste by using microbial dry digestion. In particular, two-stage reactors are used to relieve the inhibition of the accumulation of organic acids on the methanogenic process. In the field of comprehensive classification utilization and advanced treatment of waste. Background technique [0002] my country has a large amount of solid biomass waste that needs to be disposed of. For example, most urban waste is piled up in the open air, which generates a large amount of heat energy and harmful gases such as ammonia, methane, and hydrogen sulfide. The gas concentration is too high to form a stench, surrounding the city from the air. At the same time, these wastes will spontaneously ignite and explode. This not only affects the urban landscape, but also pollutes the air, water and soil, posing a threat t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40C12P5/02C12M1/107C12M1/02
CPCC02F3/286C02F11/04C12M21/04C12M21/16C12M23/58C12M29/18C12P5/023C12P7/40Y02E50/30Y02W10/20
Inventor 李望良张志凯张光义许光文
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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