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Method for treating crop straws by utilizing acidizing fermentation liquor backflow and applications thereof

A technology of crop straw and acidification fermentation, which is applied in fermentation, waste fuel, etc., can solve the problems of waste of straw resources, etc., and achieve the effects of increasing methane production, reducing digestion time, and improving the efficiency of digestion and gas production

Inactive Publication Date: 2012-07-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only causes the waste of straw resources, but the rational and efficient use of straw resources has become a concern of the whole society.

Method used

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  • Method for treating crop straws by utilizing acidizing fermentation liquor backflow and applications thereof
  • Method for treating crop straws by utilizing acidizing fermentation liquor backflow and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After the straw is mechanically crushed, it is air-dried. The 30-mesh powder was selected by sieving and mixed with the refluxing straw hydrolysis and acidification solution according to the solid-to-liquid ratio of 1:10 (mass ratio), and the pretreatment time was 24 hours. After pretreatment, the total chemical oxygen demand (TCOD) in the liquid phase of crop straw increased by 1453mg / L. After pretreatment, the straw enters the hydrolysis acidification tank through the sludge pump, and the hydraulic retention time is 48 hours. The measured straw concentration is 24.5%, and the pH value of the fermentation liquid drops to 3.46. After hydrolysis and acidification, the straw enters the methane production pool through the sludge pump, the hydraulic retention time is 150h, and the methane production increases by 67.4%.

Embodiment 2

[0018] After the straw is mechanically crushed, it is air-dried. The 40-mesh powder was selected by sieving and mixed with the refluxed straw hydrolysis and acidification solution according to the solid-to-liquid ratio of 1:16 (mass ratio), and the pretreatment time was 36 hours. After pretreatment, the total chemical oxygen demand (TCOD) in the liquid phase of crop straw increased by 2132mg / L. After pretreatment, the straw enters the hydrolysis acidification tank through the sludge pump, the hydraulic retention time is 24 hours, the measured straw concentration is 21.3%, and the pH value of the fermentation liquid drops to 3.03. After hydrolysis and acidification, the straw enters the methane production pool through the sludge pump, the hydraulic retention time is 190h, and the methane production is increased by 74.6%.

Embodiment 3

[0020] After the straw is mechanically crushed, it is air-dried. The 50-mesh powder was selected by sieving and mixed with the refluxed straw hydrolysis acidification solution according to the solid-to-liquid ratio of 1:18 (mass ratio), and the pretreatment time was 42 hours. After pretreatment, the total chemical oxygen demand (TCOD) in the liquid phase of crop straw increased by 2643mg / L. After the pretreatment, the straw enters the hydrolysis acidification tank through the sludge pump, the hydraulic retention time is 75h, the measured straw concentration is 32.7%, and the pH value of the fermentation liquid drops to 2.56. After hydrolysis and acidification, the straw enters the methane production tank through the sludge pump, the hydraulic retention time is 200h, and the methane production is increased by 83.4%.

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Abstract

The invention discloses a method for treating crop straws by utilizing acidizing fermentation liquor backflow and applications thereof. The method for treating the crop straws by utilizing the acidizing fermentation liquor backflow comprises the following steps: performing hydrolytic acidification on the crop straws; then, enabling the acidizing fermentation liquor of the crop straws to flow back to perform acidolysis pretreatment on the crop straws; then, performing hydrolytic acidification fermentation on the pretreated crop straws; and finally, producing methane by utilizing the crop straws. According to the method for treating the crop straws by utilizing the acidizing fermentation liquor backflow, the acidolysis pretreatment is performed on the crop straws by utilizing the fermentation liquor of the crop straws, thereby, the time required by anaerobic digestion is shortened, the gas production rate is increased, and the operating cost is reduced. The invention provides a method for increasing the two-phase anaerobic digestion efficiency through pretreating the crop straws by utilizing the fermentation liquor backflow of the crop straws.

Description

technical field [0001] The invention belongs to the field of biomass energy, and more specifically, mainly relates to a method for treating straws by using the reflux of acidified fermentation liquid of crop straws. Background technique [0002] Sewage plant sludge needs to be stabilized before landfilling. Anaerobic digestion is an effective method, and anaerobic digestion has attracted more and more attention because of its ability to generate energy. Anaerobic digestion can achieve the purpose of sludge reduction and resource utilization, but the anaerobic digestion process of excess sludge is a slow and difficult process, mainly because the cell wall protects cells from osmotic lysis, which hinders the digestion of intracellular substances . Acid pretreatment is an effective method to promote anaerobic digestion, mainly to crack the cell wall, which is manifested in shortened digestion time and increased gas production. General pretreatment methods include: chemical ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 王芬季民王拓
Owner TIANJIN UNIV
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