Continuous dry anaerobic fermentation method

A dry anaerobic fermentation and anaerobic fermentation technology, applied in the field of continuous dry anaerobic fermentation, can solve the problems of low degradation efficiency and degradation degree.

Inactive Publication Date: 2012-11-28
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with wet fermentation, the dry fermentation process mainly has the advantages of saving water, saving man-hours required for the management of biogas digesters, and higher tank volume gas production rate. However, due to the influence of microbial activity, the dry anaerobic fermentation technology has lower degradation efficiency Vermicomposting and high-temperature aerobic fermentation are poor, especially the degradation efficiency and degree of degradation of cellulose and lignin substances (see [1] Li Xiang, Zhao Lixin, Han Jie, etc., New Directions for Resource Utilization of Agricultural Wastes— —Biogas Dry Fermentation Technology [J], China Biogas, 2006, 24(4): 23-27; [2] Li Dong, Ma Longlong, Yuan Zhenhong, etc. Experimental research on dry anaerobic fermentation of rice straw at room temperature in South China [J], Journal of Agricultural Engineering, 2006, 22 (12): and [3] Weiland P., Anaerobic waste digestion in germany-status and recent developments [J], Biodegradation, 2000, 11 (6): 415-421)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] According to the sorting standard of urban domestic waste, the organic waste such as kitchen, fruit and vegetable is sorted out, and the organic solid waste such as fruit and vegetable waste and straw collected in the bazaar is crushed to make the particle size of the material less than 5cm. After determination, the basic shape of the material is shown in Table 1:

[0098] Table 1 Basic Properties of Raw Materials

[0099]

[0100] Mix according to 28.3% (dry weight) of food waste, 19.7% (dry weight) of fruit and vegetable waste, 17.2% (dry weight) of straw, and 34.8% (dry weight) of livestock and poultry manure, so that the moisture content of the material is 75%. The volume of the reaction device is 130L.

[0101]Add the mixed material into the continuous dry anaerobic fermentation device, the loading volume is 100L, then close the reaction device, ferment for 35 days, then add 3.25L of fresh material to the reaction device every 24h, and at the same time, pass th...

Embodiment 2

[0103] According to the sorting standard of urban domestic waste, the organic waste such as kitchen, fruit and vegetable is sorted out, and the organic solid waste such as fruit and vegetable waste and straw collected in the bazaar is crushed so that the particle size of the material is less than 5cm. After determination, the basic shape of the material is shown in Table 1:

[0104] Table 2 Basic Properties of Raw Materials

[0105]

[0106]

[0107] Mix according to 28.3% (dry weight) of food waste, 19.7% (dry weight) of fruit and vegetable waste, 17.2% (dry weight) of straw, and 34.8% (dry weight) of livestock and poultry manure, so that the moisture content of the material is 75%. The volume of the reaction device is 40m 3 .

[0108] Add the mixed material into the continuous dry anaerobic fermentation device, the loading volume is 30m 3 , then close the reaction device, ferment for 35 days, and then add fresh material 1m to the reaction device every 24h 3 , at th...

example 1

[0109] After the stable operation of Example 1, 3.25L of fresh material can be added every day. In the treatment of Example 2, during the stable operation period, 1m of fresh organic solid waste can be processed daily. 3 . This is achieved through the setting of the feed and discharge buffer chambers. The feed buffer chamber set at the feed end and the discharge buffer chamber set at the discharge end realize the function of continuous operation, thereby realizing the daily production and clearing of organic solid waste.

[0110] Through the solar device and the water bath heating layer installed in the continuous fermentation device, the solar device provides the heat source, and the water bath layer realizes the heat transfer to heat the materials in the main warehouse, ensuring that the anaerobic fermentation is performed when the temperature is lower than 20°C. The temperature of the device rises to 36°C ± 1°C, and the temperature of the fermentation system is maintained ...

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Abstract

The invention relates to a continuous dry anaerobic fermentation method which comprises the following steps: A) raw material filling: adding organic solid waste into a fermentation container; B) fermentation starting: sealing the fermentation container to carry out anaerobic fermentation; C) feeding: adding the fresh organic solid waste into the fermentation container with a feeding buffer unit or system; D) discharging: while carrying out the step C, taking out the fermented material with a discharging buffer unit or system; and E) continuous operation: repeating the steps C and D. In the whole anaerobic fermentation process, a solar device can be utilized to heat the fermentation device.

Description

technical field [0001] The invention relates to the technical fields of environmental protection and energy utilization, and relates to a continuous dry anaerobic fermentation method. Background technique [0002] If solid waste is not disposed of in a timely manner, it will often cause garbage to spread, sewage to flow across, mosquitoes and flies to breed, emit odor, and become a breeding ground for various pathogenic microorganisms, affecting environmental sanitation and endangering human health. At present, solid waste pollution is becoming more and more serious. [0003] Dry anaerobic fermentation, also known as high solid anaerobic digestion, refers to the use of anaerobic bacteria to decompose it into CH when the total solid content is about 20% to 40%. 4 , CO 2 、H 2 For the fermentation process of gases such as S, the dry anaerobic fermentation process is extremely complicated, requiring a variety of microorganisms to participate in the reaction, and it must be ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/00C05F15/00
CPCY02P20/133Y02W30/40
Inventor 杨天学席北斗何连生侯浩波霍守亮张媛李丹夏训峰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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