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Method for producing biogas through semi-continuous dry anaerobic fermentation of cassava residues

A technology of dry anaerobic fermentation and cassava residues, which is applied in the field of semi-continuous dry anaerobic fermentation of cassava residues to produce biogas, can solve the problems of increased processing costs of cassava residues, increased process complexity, and increased operating costs, and achieve improved substrate conversion efficiency, less water consumption and less biogas slurry

Inactive Publication Date: 2018-12-18
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the process adds an acid hydrolysis tank step as a pretreatment, which increases the processing cost of cassava residues, and the waste liquid generated by the acid hydrolysis tank needs to increase the follow-up treatment process, resulting in an increase in process complexity and operating costs

Method used

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  • Method for producing biogas through semi-continuous dry anaerobic fermentation of cassava residues
  • Method for producing biogas through semi-continuous dry anaerobic fermentation of cassava residues
  • Method for producing biogas through semi-continuous dry anaerobic fermentation of cassava residues

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Embodiment 1

[0022] The cassava residue used in this embodiment comes from the residue waste of a cassava starch factory in a certain city in Guangxi Zhuang Autonomous Region. The specific operation process is as follows:

[0023] (1) Take cassava slag, pass through a 60-mesh sieve after drying, and store in a refrigerator at 4°C for later use. The physical and chemical properties of cassava slag are shown in Table 1.

[0024] (2) Start with a load of 3.0gVS / (L·d), increase the load by 20% to 30% in each stage, the load starts to increase from 3.0gVS / (L·d), after 4.0, 5.0, 6.5, 8.0gVS / (L·d) until 10.0gVS / (L·d), every 6d is a load cycle.

[0025] (3) Mix the product of step (1) with biogas residue, add the mixture with a solid content (TS) of 15% into a 1L fermenter, and ferment anaerobically at 32-37°C for 42 days, adding Quantify the cassava residue, take out the same amount of mixture at the same time, and stir it irregularly. The daily addition amount is shown in Table 2.

[0026] T...

Embodiment 2

[0033] The cassava residue used in this embodiment comes from the residue waste of a cassava starch factory in a certain city in Guangxi Zhuang Autonomous Region. The specific operation process is as follows:

[0034](1) Take cassava residue, pass through a 60-mesh sieve after drying, and store in a refrigerator at 4°C for later use. The physical and chemical properties of cassava residue are shown in Table 1.

[0035] (2) Start with a load of 3.0gVS / (L·d), increase the load by 20% to 30% in each stage, the load starts to increase from 3.0gVS / (L·d), after 4.0, 5.0, 6.5, 8.0gVS / (L·d) until 10.0gVS / (L·d), every 6d is a load cycle.

[0036] (3) Mix the product of step (1) with biogas residue, add the mixture with a solid content rate of 20% into a 1L fermenter, perform anaerobic fermentation at 32-37°C for 42 days, and add quantitative cassava residue every day , and take out an equal amount of the mixture at the same time, and stir it irregularly. The daily addition amount is...

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Abstract

The invention discloses a method for producing biogas through semi-continuous dry anaerobic fermentation of cassava residues. The method comprises the following concrete steps: (1) pretreatment and mixing of materials: subjecting the cassava residues to drying and sieving, refrigerating the obtained product at 4 DEG C for subsequent usage, mixing the product with biogas residues, and allowing a solid content to reach 15% to 25%; (2) starting of a reactor: starting the reactor at a load of 3.0 gVS / (L.d), increasing 20%-30 % of load each time until the load of the reactor is 10.0 gVS / (L.d); and(3) adding a mixture into a fermenter, starting anaerobic fermentation at 32-37 DEG C in stages for 30-45 d, adding a fixed amount of the cassava residues and taking out an equal amount of the mixtureeach day, and carrying out stirring regularly. Compared with traditional semi-continuous wet anaerobic fermentation of cassava residues with high solid content, the method provided by the invention has the following advantages: high specific biogas yield can be still obtained under the conditions of higher solid content and organic load, and optimal effect can be improved by 55%; the specific yield of methane is decreased, but the specific methane yield still reaches 80% or more of the specific methane yield of traditional semi-continuous wet anaerobic fermentation; and the content of methaneis slightly decreased by about 18% to 30%.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic solid waste, and in particular relates to a method for producing biogas by semi-continuous dry anaerobic fermentation of cassava residues. Background technique [0002] Cassava is one of the three major tuber crops in the world. Its origin is mainly distributed in the tropical regions of South America. It was introduced and cultivated in my country in the 1920s. It has been well promoted in South China, and it is most cultivated in Guangxi and Guangdong. In recent years, although domestic cassava production has been increasing, it still cannot meet people's needs. Therefore, my country needs to import a large amount of cassava from abroad every year. With the strong demand in the cassava market, this will inevitably cause the output of cassava residues produced by cassava processing enterprises to increase year by year, and cassava residues are prone to acidification and o...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 张军伍荣军周宸宇王敦球
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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