Device and method for efficiently preparing biogas by two-stage high-temperature anaerobic fermentation of composite materials

A technology of two-stage anaerobic fermentation and high-temperature anaerobic fermentation, applied in biochemical equipment and methods, fermentation, waste fuel, etc., can solve the problems of unstable acidification operation, high maintenance cost, poor processing capacity, etc. The effect of stable operation, high gas production load and strong tolerance

A technology of two-stage anaerobic fermentation and high-temperature anaerobic fermentation, applied in biochemical equipment and methods, fermentation, waste fuel, etc., can solve the problems of unstable acidification operation, high maintenance cost, poor processing capacity, etc. The effect of stable operation, high gas production load and strong tolerance

CN104673657BActive Publication Date: 2015-12-16北京海珍志阔科技有限公司
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  • Device and method for efficiently preparing biogas by two-stage high-temperature anaerobic fermentation of composite materials
  • Device and method for efficiently preparing biogas by two-stage high-temperature anaerobic fermentation of composite materials
  • Device and method for efficiently preparing biogas by two-stage high-temperature anaerobic fermentation of composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The present invention also provides a method for preparing biogas by anaerobic fermentation, comprising the following steps:

[0072] see figure 1 , (1) The materials are divided into two categories, and the materials are divided into two categories according to whether they are fermented waste:

[0073] The first type of material is fermented waste; it is cow manure + pig manure. Since this material has undergone anaerobic digestion, the material has a strong buffering ability against acid and alkali and is easy to be hydrolyzed again.

[0074] The second type of material is the product that has not been anaerobically fermented; specifically, it is food waste;

[0075] (2) Pretreat the classified materials separately:

[0076] The first type of material is transported by tanker to the material storage tank, and the sand, stones, wood blocks, plastics, etc. in the material are removed by pretreatment equipment such as grilles, crushers, and grit chambers. The equipmen...

Embodiment 2

[0092] Basically the same as Example 1, the difference is: the first type of material is cow dung+chicken manure, and the second type of material is livestock carcasses and slaughter waste, which stays in the first-level anaerobic fermentation tank for 4 days. Stay in the second-level anaerobic fermentation tank for 8 days.

[0093] The scheduled time for the first type of material to enter the secondary anaerobic fermentation tank is 15 minutes, and the scheduled reflux time is 15 minutes; the scheduled time for the second type of material to be fed into the secondary anaerobic fermentation tank is 45 minutes, and the scheduled reflux time is 45 minutes. minute;

[0094] The temperature in the secondary anaerobic fermentation tank is 52°C, the hydraulic retention time is 18 days, and the daily temperature change of the secondary anaerobic fermentation tank is less than 1°C.

Embodiment 3

[0096] It is basically the same as Example 1, except that the first type of material is pig manure, and the second type of material is municipal sludge. Stay in the first-level anaerobic fermentation tank for 2 days, and stay in the second-level anaerobic fermentation tank for 10 days.

[0097] The scheduled time for the first type of material to enter the secondary anaerobic fermentation tank is 20 minutes, and the scheduled reflux time is 20 minutes; the scheduled time for the second type of material to be fed into the secondary anaerobic fermentation tank is 45 minutes, and the scheduled reflux time is 45 minutes. minute;

[0098] The temperature in the secondary anaerobic fermentation tank is 52°C, the hydraulic retention time is 20 days, and the daily temperature change in the secondary anaerobic fermentation tank is controlled within plus or minus 1°C.

[0099] The effect of the present invention is illustrated below through a specific embodiment:

[0100] To realize t...

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Abstract

The invention discloses a device for effectively preparing biogas through secondary high-temperature anaerobic fermentation of a composite material and a method thereof. The device comprises a first primary anaerobic fermentation tank and a second primary anaerobic fermentation tank, wherein the first primary anaerobic fermentation tank is connected with one end of a first heat exchanger; the other end of the first heat exchanger is respectively connected with the first primary anaerobic fermentation tank and a secondary anaerobic fermentation tank; the second primary anaerobic fermentation tank is connected with one end of the second heat exchanger, and the other end of the second heat exchanger is respectively connected with a second primary anaerobic fermentation tank and the secondary anaerobic fermentation tank; a biogas transporting port is formed in the secondary anaerobic fermentation tank. The method comprises the following steps: (1) classifying the materials; (2) pre-processing the classified materials; (3) preparing a primary processing material and a secondary processing material; (4) feeding into the secondary anaerobic fermentation tank and refluxing; and (5) collecting the biogas generated by the secondary anaerobic fermentation tank. The device has the advantages of stable long-time running, strong endurance capacity on the ammonia nitrogen, the acid base and the volatile organic acid and high gas productivity.

Description

technical field [0001] The invention relates to the field of biogas preparation, in particular to a device and method for efficiently preparing biogas by secondary high-temperature anaerobic fermentation of composite materials. Background technique [0002] Urban and rural waste is an important source of pollution, polluting water, soil and the atmosphere. 60% of river pollution in our country comes from livestock and poultry manure, and environmental governance is very urgent. Since the adoption of conventional environmental protection treatment means is a negative investment, it brings a huge burden to the government. With the way of recycling waste, the current technology, whether it is the production of solid fertilizer or the utilization of biogas, cannot realize real industrialization due to the low return on investment. [0003] China has a long history of using anaerobic fermentation to produce biogas. As of the end of 2010 (statistics from the Ministry of Agricul...

Claims

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Application Information

Patent Timeline
16 Dec 2015
Publication
CN104673657B
IPC
C12M1/107; C12P5/02; C02F11/04
CPC
C02F11/04; C12M21/04; C12M27/02; C12M41/18; C12P5/023; Y02E50/30
Inventors
康一群