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Method of treating kitchen waste by using kitchen waste treating apparatus

A kitchen waste and treatment device technology, which is applied in biomass post-treatment, biomass pretreatment, biochemical cleaning devices, etc., can solve the problem that the mixing in the hydrolysis and acidification stage cannot be guaranteed, the phase separation cannot be completely realized, and the output of hydrolysis and acidification is reduced. VFA concentration and other problems in the liquid, to achieve the effect of being conducive to stable operation, improving the efficiency of hydrolysis and acidification, and improving the uniformity of pH

Active Publication Date: 2012-12-19
SHANGHAI JIAO TONG UNIV
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  • Description
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Problems solved by technology

However, pure interphase digestive fluid circulation cannot ensure the mixing in the hydrolysis and acidification stage. The material in the hydrolysis and acidification reactor is in a compacted state, and the pH of the upper layer is slightly higher. Anaerobic microorganisms in the methanogenic effluent are easy to accumulate in the upper layer, produce methane, and reduce hydrolysis. The VFA concentration in the acidified effluent cannot completely achieve phase separation

Method used

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  • Method of treating kitchen waste by using kitchen waste treating apparatus
  • Method of treating kitchen waste by using kitchen waste treating apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. The kitchen waste is first crushed into a slurry, the mass percentage concentration of total solids (TS) is measured as 20%, the mass percentage concentration of volatile solids (VS) in TS is 95%, and the pH of the feed kitchen waste is 3.3. Dilute the kitchen waste with the effluent of the methanogenic reactor when feeding. The COD concentration of the diluted kitchen waste feed is 32g / L. The hydraulic retention time in the hydrolysis and acidification stage is 3 days. The feed COD of kitchen waste The load is 10g·(L·d) -1 ;

[0030] 2. The two-phase anaerobic digestion of kitchen waste is carried out in a glass reactor with an effective volume of 2L. figure 1shown. The reactor consists of a lower hollow elongated section 9 and an upper three-phase separator 8 . The lower elongated part has a diameter of 60mm and a height of 400mm; the upper spherical part has a diameter of 150mm. The two-phase anaerobic digestion process of kitchen waste operates intermittently...

Embodiment 2

[0035] 1. The kitchen waste is first crushed into a slurry, the mass percentage concentration of total solids (TS) is measured as 20%, the mass percentage concentration of volatile solids (VS) in TS is 95%, and the pH of the feed kitchen waste is 3.3. Dilute the kitchen waste with the effluent of the methanogenic reactor when feeding. The COD concentration of the diluted kitchen waste feed is 32g / L. The hydraulic retention time in the hydrolysis and acidification stage is 3 days. The feed COD of kitchen waste The load is 16g·(L·d) -1 ;

[0036] 2. The two-phase anaerobic digestion of kitchen waste is carried out in a glass reactor with an effective volume of 2L. figure 1 shown. The reactor consists of a lower hollow elongated section and an upper three-phase separator. The lower elongated part has a diameter of 60mm and a height of 400mm; the upper spherical part has a diameter of 150mm. The two-phase anaerobic digestion process of kitchen waste is operated in batch mode. ...

Embodiment 3

[0041] 1. The kitchen waste is first crushed into a slurry, the mass percentage concentration of total solids (TS) is measured as 20%, the mass percentage concentration of volatile solids (VS) in TS is 95%, and the pH of the feed kitchen waste is 3.3. Dilute the kitchen waste with the effluent of the methanogenic reactor when feeding. The COD concentration of the diluted kitchen waste feed is 32g / L. The hydraulic retention time in the hydrolysis and acidification stage is 3 days. The feed COD of kitchen waste The load is 20g·(L·d) -1 ;

[0042] 2. The two-phase anaerobic digestion of kitchen waste is carried out in a glass reactor with an effective volume of 2L. figure 1 shown. The reactor consists of a lower hollow elongated section and an upper three-phase separator. The lower elongated part has a diameter of 60mm and a height of 400mm; the upper spherical part has a diameter of 150mm. The two-phase anaerobic digestion process of kitchen waste is operated in batch mode. ...

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Abstract

The invention relates to a method of treating kitchen waste by using a kitchen waste treating apparatus. The kitchen waste treating apparatus comprises a hydrolysis acidification reactor, a methanogenic reactor, a feed pump, a liquid feeding pipe, a liquid circulation pump I, a liquid circulation pump II, a production gas metering device and a vacuum pump, wherein the hydrolysis acidification reactor and the methanogenic reactor are both composed of a hollow elongated part at a lower part and a three-phase separator at an upper part. With the treating apparatus and the method provided by the invention, alkalinity in the hydrolysis acidification reactor is increased, so hydrolysis acidification efficiency is improved, composition of acidification products is enhanced, lactic acid concentration is reduced and VFA concentration is increased; in-phase digestive fluid circulates in the process of two-phase anaerobic digestion, which is beneficial for ensuring full mixing between organic matters and microbes in the hydrolysis acidification reactor and the methanogenic reactor and for improving homogeneity of pH values in the hydrolysis acidification reactor and the methanogenic reactor, and therefore, stable operation of a system is benefited.

Description

technical field [0001] The invention relates to a treatment method for kitchen waste, in particular to a method for treating kitchen waste with a two-phase anaerobic digestion treatment device for kitchen waste. Background technique [0002] Municipal solid waste is usually treated by a single-phase anaerobic digestion process, but this process is prone to unbalanced fermentation of acid production and methane production during the process of increasing the load, accumulation of volatile acids (VFA), sharp drop in pH, and methanogens Inhibited, especially for wastes such as kitchen waste that contain high levels of biodegradable organic matter. The essential feature of two-phase anaerobic digestion is to realize the separation of the biological phase, that is, the acid-producing phase and the methanogenic phase become two independent processing units. The optimal ecological conditions of the microorganisms, thereby forming a complete fermentation process, and greatly improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12M1/34C12M1/107
CPCY02E50/343C12M45/04C12M41/34C12M47/18C12M21/04Y02E50/30
Inventor 张波蔡伟民何义亮
Owner SHANGHAI JIAO TONG UNIV
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