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A kind of method for aerobic-anaerobic two-step fermentation treatment of diseased animal wastewater

A disease and animal technology, applied in the field of diseased animal wastewater treatment, can solve the problems of nutrient loss, high energy consumption, insufficient oxygen supply, etc., and achieve the effects of improving fertilizer efficiency, increasing production, reducing energy consumption and operating costs.

Active Publication Date: 2022-07-19
NORTHEAST AGRICULTURAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of method for aerobic-anaerobic two-step fermentation treatment of diseased animal wastewater
  • A kind of method for aerobic-anaerobic two-step fermentation treatment of diseased animal wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0068] S1. Mix the diseased animal waste water, crushed straw and filtered biogas slurry (TS is about 1%) according to the mass ratio of 5.6:1:5.6. The mixed liquid has a TS of 8.3% and a carbon-nitrogen ratio of 22:1. , the mixed solution was placed at room temperature for 2-3d, and the pH was adjusted to 7.0-7.5 to obtain the acidification reaction complete slurry substrate;

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

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

Embodiment 2

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

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

[0081] After the anaerobic fermentation is completed, the methane content in the produced biogas is above 55%, and the methane production of VS 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 diseased animal wastewater, crushed straw and filtered biogas slurry (TS is 1%) are uniformly mixed in a mass ratio of 3.4:1:3.4, and the mixed solution is The TS is 12.4%, the carbon-nitrogen ratio is 34:1, the mixed solution is placed at room temperature for 2-3 d, and the pH is adjusted to 7.0-7.5 to obtain the acidification reaction full slurry substrate.

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

[0086] After the anaerobic fermentation is completed, the methane content in the produced biogas is above 55%, and the methane production of VS 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 diseased animal wastewater by aerobic-anaerobic two-step fermentation, and belongs to the technical field of diseased animal wastewater treatment. The method includes: S1, mixing diseased animal wastewater, pulverized straw and filtered biogas slurry to obtain an acidification reaction full slurry substrate; S2, adding a bacterial agent to the acidification reaction full slurry substrate, which is divided into four groups according to the growth cycle of the microorganisms. In each stage, the amount of dissolved oxygen is controlled and aerobic acidification is carried out; S3, the acidified whole slurry liquid is mixed with the unfiltered biogas slurry, and anaerobic fermentation is carried out; S4, the residue after fermentation is subjected to solid-liquid separation, and the solid is used for For further composting, the liquid acts as a liquid humic acid fertilizer. The method introduces different amounts of air in different growth periods of microorganisms, dynamically regulates the hydrolysis and acidification process, rapidly hydrolyzes and acidifies the waste water of diseased animals and straws, improves the fertilizer efficiency of the anaerobic fermentation residue, and saves the energy consumption of aerobic aeration. The transformation of diseased animal wastewater into two high-value products of biogas and biofertilizer has been realized.

Description

technical field [0001] The invention relates to the technical field of diseased animal wastewater treatment, in particular to a method for treating diseased 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 has continued to increase, and frequently-occurring epidemics have continued, resulting in the production of a large number of diseased animal carcasses. According to the "Technical Specifications for the Harmless Treatment of Dead Animals" issued by the Ministry of Agriculture of the People's Republic of my country with Nong Yi Fa [2013] No. The so-called harmless treatment refers to the process of using physical, chemical and other methods to treat dead animal carcasses and related animal products, eliminate the pathogens they carry, and eliminate the harm of animal carcasses, so as to prevent the hidden danger...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
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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