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Method for rapidly producing acid and cooperatively producing gas through dry-wet coupling anaerobic fermentation

An anaerobic fermentation, dry-wet coupling technology, used in fermentation, biological sludge treatment, waste fuel, etc., can solve the problems of high organic load, difficult mass transfer, heat transfer, affecting the gas production efficiency of the system, etc., to improve the degradation rate. degree, improve gas production efficiency, and avoid the effect of inhibition

Pending Publication Date: 2022-02-08
ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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AI Technical Summary

Problems solved by technology

Dry anaerobic fermentation can meet the needs of treating organic waste with high solid content (TS>20%), but due to high organic load, mass transfer and heat transfer are difficult, volatile fatty acid accumulation is prone to inhibit and seriously affect the system gas production efficiency

Method used

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  • Method for rapidly producing acid and cooperatively producing gas through dry-wet coupling anaerobic fermentation
  • Method for rapidly producing acid and cooperatively producing gas through dry-wet coupling anaerobic fermentation
  • Method for rapidly producing acid and cooperatively producing gas through dry-wet coupling anaerobic fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Method for solving rapid acid coating gasification gas in dry wet coupled anureoxic fermentation (see figure 1 ), Consisting of the following steps:

[0034] 1) Mix the corn stalk and cow dung mixed into fermented raw materials, regulating the mass ratio of straw and cow dung as 7: 3 (carbon nitrogen ratio (25 ± 0.44): 1); adjusted foreign biogasic acid in 0.5 mol / L hydrochloric acid ( The pH of the three-river bread farm culture, pH is 8.0), the pH of 5.5, the amount of inoculation is 1 l / time (the amount of foreign biogas is inoculated is 30 wt.%) Of the fermentation material, 4 times / day In addition to the external biogas solution after adjusting the pH, the pre-batch dry anaerobic fermentation is performed as a 5L perfigenated bed reactor as a dry wet coupling anureoxic fermentation. The TS (Rate) The hydrolyzate process is completed under 25% of the hydrolyzate process, and the acidified cycle is stored in the reservoir;

[0035] 2) Mix the biogaside in the reser...

Embodiment 2

[0037] A method similar to that of Example 1, which distinguishes the mass ratio of straw and cow dung in step 1) of 6: 4 (carbon nitrogen ratio (24 ± 0.14): 1).

Embodiment 3

[0039] A method in Example 1 a similar embodiment, except that the mass ratio of Step 1) in dung and straw is 5: 5 (ratio of carbon and nitrogen (21 ± 0.66): 1).

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Abstract

The invention relates to the technical field of biogas fermentation, in particular to a method for rapidly producing acid and cooperatively producing gas through dry-wet coupling anaerobic fermentation. According to the method disclosed by the invention, the inhibition effect between microorganisms and metabolites can be effectively avoided through a method for compositely adjusting and controlling a proper substrate ratio (carbon nitrogen ratio) and adjusting the pH value of exogenous biogas slurry, the rapid acid production of an acid production phase is enhanced, the degradation degree of the substrate is improved, the hydrolysis acid production period is shortened to 3d, Meanwhile, the volatile acid yield of the acid production phase (dry anaerobic fermentation) in the 3d is further enhanced; besides, the acidified biogas slurry rich in a large amount of soluble substances is fed into the methanogenesis phase (wet anaerobic fermentation) to efficiently produce gas, the gas production efficiency of anaerobic fermentation is improved. Meanwhile, the biogas slurry produced by the methanogenesis phase can flow back and be sprayed to the acidogenesis phase to be recycled, the substrate utilization rate and the effluent quality are improved, and the resource utilization rate of agricultural wastes is further improved.

Description

Technical field [0001] The present invention relates to the field of biogas fermentation techniques, and more particularly to a method of rapidly producing an anaerobic fermentation of dry wet coupling. Background technique [0002] China is an agricultural big country, producing a large number of agricultural waste such as livestock and poultry and straw each year. With the improvement of rural living standards, the amount of organic waste generated by rural production and life increases 8% ~ 10% per year, with The base is large, the type is more, and the composition is complex. Anaerobic fermentation technology is one of the important ways to produce agricultural waste, producing clean energy, currently, wet anaerobic fermentation technology to deal with agricultural waste (TS <15%) has been widely used, and the technology is mature, but not Suitable for treating high-level curling waste. Dry anaerobic fermentation can meet the demand for the treatment of high curing rate (T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC12P5/023C02F11/04Y02E50/30
Inventor 于佳动赵立欣冯晶梁依叶炳南荆勇
Owner ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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