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Method for treating epidemic disease animal wastewater through aerobic-anaerobic two-step fermentation

A disease and animal technology, applied in microbial treatment, chemical fertilizer treatment control, combined biological treatment, etc., can solve the problems of high energy consumption, insignificant improvement of gas production efficiency, loss of nutrients, etc., to reduce process energy consumption and operating costs , maintain low cost operation, increase the effect of production

Active Publication Date: 2021-03-05
NORTHEAST AGRICULTURAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional aerobic fermentation process, the amount of oxygen flow is often fixed. Excessive oxygen flow will take away a lot of heat, resulting in high energy consumption, and promote the excessive growth of microorganisms, resulting in the loss of nutrients, and high concentration of oxygen It will inhibit the growth of methanogenic microorganisms, making the improvement of gas production efficiency not obvious
Insufficient oxygen flow is difficult to meet the growth needs of microorganisms, making the pollutant conversion effect poor

Method used

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  • Method for treating epidemic disease animal wastewater through aerobic-anaerobic two-step fermentation
  • Method for treating epidemic disease animal wastewater through aerobic-anaerobic two-step fermentation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A method for aerobic-anaerobic two-step fermentation treatment of epidemic animal wastewater, comprising the following steps:

[0068] S1. According to the mass ratio of 5.6:1:5.6, mix the epidemic animal wastewater, crushed straw and filtered biogas slurry (TS is about 1%) evenly. The TS of the mixed liquid is 8.3%, and the carbon-nitrogen ratio is 22:1. , place the mixed solution at room temperature for 2-3 days, adjust the pH to 7.0-7.5, and obtain the whole slurry substrate of the acidification reaction;

[0069] S2. Import the whole slurry substrate of the acidification reaction into a hydrolysis acidification tank, and add Bacillus subtilis whose mass is 5% of the total mass of the whole slurry substrate of the acidification reaction, and adjust the dissolved oxygen in stages, at a temperature of 37±1°C Carry out aerobic acidification under the condition; Described regulation and control dissolved oxygen amount in stages is:

[0070] Within 0-4h, do not ventilate i...

Embodiment 2

[0079] The difference between Example 2 and Example 1 is that in step S1, the epidemic animal wastewater, crushed straw and filtered biogas slurry (TS is 1%) are mixed uniformly according to the mass ratio of 4.2:1:4.2, and the mixed solution The TS is 11%, the carbon-to-nitrogen ratio is 30:1, and the mixed solution is placed at room temperature for 2-3 days, and the pH is adjusted to 7.0-7.5 to obtain the whole slurry substrate of the acidification reaction.

[0080] After the aerobic acidification hydrolysis, the pH of the feed liquid is 4.5-6, the volatile acid content is 8000-9000 mg / L, and the acetic acid percentage reaches 50%-55%.

[0081] After the anaerobic fermentation is completed, the methane content in the generated biogas is above 55%, and the VS methane production reaches 230mLCH 4 / gVS.

[0082] The properties of the liquid humic acid fertilizer obtained in this example are shown in Table 1.

Embodiment 3

[0084] The difference between Example 3 and Example 1 is that in step S1, the epidemic animal wastewater, crushed straw and filtered biogas slurry (TS is 1%) are mixed uniformly according to the mass ratio of 3.4:1:3.4, and the mixed solution The TS is 12.4%, the carbon-to-nitrogen ratio is 34:1, the mixture is left at room temperature for 2-3 days, and the pH is adjusted to 7.0-7.5 to obtain the whole slurry substrate of the acidification reaction.

[0085] After the aerobic acidification hydrolysis, the pH of the feed liquid is 4-6, the volatile acid content is 9000-10000 mg / L, and the acetic acid percentage reaches 55%-60%.

[0086] After the anaerobic fermentation is completed, the methane content in the generated biogas is above 55%, and the VS methane production reaches 250mLCH 4 / gVS.

[0087] The properties of the liquid humic acid fertilizer obtained in this example are shown in Table 1.

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Abstract

The invention provides a method for treating epidemic disease animal wastewater through aerobic-anaerobic two-step fermentation, and belongs to the technical field of epidemic disease animal wastewater treatment. The method comprises the following steps: S1, mixing epidemic disease animal wastewater, crushed straw and filtered biogas slurry to obtain an acidification reaction full-slurry substrate; S2, adding a microbial inoculum into the acidification reaction full-slurry substrate, regulating the dissolved oxygen content in four stages according to the growth cycle of microorganisms, and carrying out aerobic acidification; S3, mixing the acidified full slurry with unfiltered biogas slurry, and carrying out anaerobic fermentation; and S4, carrying out solid-liquid separation on the fermented residues, further composting the solid, and taking the liquid as a liquid humic acid fertilizer. According to the method, different amounts of air are introduced in different growth periods of microorganisms, the hydrolytic acidification process is dynamically regulated and controlled, the epidemic disease animal wastewater and straw are quickly subjected to hydrolytic acidification, the fertilizer efficiency of anaerobic fermentation residues is improved, the aerobic aeration energy consumption is reduced, and the epidemic disease animal wastewater is converted into two high-valued products, namely biogas and biogas manure.

Description

technical field [0001] The invention relates to the technical field of treatment of epidemic animal wastewater, in particular to a method for treating epidemic animal wastewater by aerobic-anaerobic two-step fermentation. Background technique [0002] With the rapid development of my country's livestock and poultry breeding industry, the number of livestock and poultry continues to increase, and frequent disease outbreaks continue, resulting in a large number of diseased animal remains. According to the "Technical Specifications for the Harmless Treatment of Diseased and Dead Animals" issued by the Ministry of Agriculture in Nongyifa [2013] No. 34, it is required to carry out harmless treatment of sick and dead animals. The so-called harmless treatment refers to the process of treating dead animal carcasses and related animal products with physical and chemical methods to eliminate the pathogens carried by them, eliminate the hazards of animal carcasses, and prevent the hidd...

Claims

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Application Information

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IPC IPC(8): C05G3/80C05G5/20C05F17/20C05F17/50C05F17/70
CPCC05G3/80C05G5/20C05F7/00C05F17/20C05F17/50C05F17/70C05F9/04C05F11/00Y02W30/40
Inventor 张鸿琼罗立娜黄欣武
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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