Sterilization, deodorization and deep-dehydration method for livestock excrements

A technology of livestock and poultry manure and deep dehydration, which is applied in chemical instruments and methods, dehydration/drying/concentrated sludge treatment, water/sludge/sewage treatment, etc. High problems, to achieve the effect of low cost, prevent water eutrophication, and facilitate large-scale industrial production

Active Publication Date: 2014-04-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drying livestock and poultry manure by high-temperature drying often consumes a lot of energy, and the resulting cost is very high, so it is difficult to promote
[0012] The above-mentioned methods have their own

Method used

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  • Sterilization, deodorization and deep-dehydration method for livestock excrements

Examples

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Embodiment 1

[0036] The present invention comprises the following steps:

[0037] a. Acidification: Use concentrated sulfuric acid to adjust the pH of the pig manure obtained through the water flushing process to 6, and the water content of the pig manure is 97%.

[0038] b. Add hydrogen peroxide: Then add hydrogen peroxide to the adjusted pH value of pig manure at the ratio of 0.5mol hydrogen peroxide per kilogram of dry weight of pig manure, and stir evenly.

[0039] c. Microwave heating treatment: heat the pig manure added with hydrogen peroxide to 95°C under microwave, then keep the temperature for microwave treatment for 5 minutes, and stir the pig manure while microwave treatment.

[0040] d. Press filter dehydration: dehydrate the microwave-treated pig manure through a membrane filter press to obtain dehydrated pig manure. The pore diameter of the filter cloth of the membrane filter press is about 25 μm.

[0041] The hygienic indicators of pig manure before and after treatment were...

Embodiment 2

[0047] The present invention comprises the following steps:

[0048] a. Acidification: After adjusting the moisture content of cow dung (initial moisture content 85%) obtained by the dry dung cleaning process to 92%, adjust the pH of the adjusted cow dung to 5 with acetic acid.

[0049] b. Add sodium persulfate: Then add sodium persulfate to the cow dung with adjusted pH value according to the ratio of 0.8mol sodium persulfate per kilogram of dry weight of cow dung, and stir evenly.

[0050] c. Microwave heating treatment: heat the cow dung added with sodium persulfate to 100°C under microwave, then keep the temperature for microwave treatment for 12 minutes, and stir the cow dung while microwave treatment.

[0051] d. Press filter dehydration: dehydrate the microwave-treated cow dung through a membrane filter press to obtain dehydrated cow dung. The pore diameter of the filter cloth of the membrane filter press is about 70 μm.

[0052] In this example, the capillary water abso...

Embodiment 3

[0054] The present invention comprises the following steps:

[0055] a. Acidification: the pH of the pig manure obtained by soaking manure in water is adjusted to 3 with hydrochloric acid, and the moisture content of the pig manure is 90%.

[0056] b. Add potassium persulfate: Then add potassium persulfate to the pig manure with adjusted pH value according to the ratio of 1.0mol potassium persulfate per kilogram of dry weight of pig manure, and stir evenly.

[0057] c. Microwave heating treatment: heat the pig manure added with potassium persulfate to 115°C under microwave, then continue to maintain the microwave treatment at this temperature for 10 minutes, and stir the pig manure while microwave treatment.

[0058] d. Press filter dehydration: dehydrate the microwave-treated pig manure through a chamber filter press to obtain dehydrated pig manure. The pore diameter of the filter cloth of the compartment filter press is about 60 μm.

[0059] In this embodiment, the capillar...

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Abstract

The invention relates to the field of treatment of livestock excrements, and in particular relates to a sterilization, deodorization and deep-dehydration method for livestock excrements. The method comprises the steps of acidification, namely adjusting the pH of the livestock excrements to be 3 to 6 by using acid; oxidization, namely adding an oxidizing agent into the acidified livestock excrements at the ratio that 0.5 to 1.2 moles of oxidizing agent is added into every kilogram of dry livestock excrements, and performing uniform stirring; microwave heating treatment, namely heating the oxidized livestock excrements to 95 to 120 DEG C by using microwaves, and continuing performing microwave treatment while stirring for 5 to 12 minutes at the temperature; pressure filtration dehydration, namely performing pressure filtration dehydration on the microwave-treated livestock excrements by using a pressure filter. The method is low in using cost, easy to operate and high in treatment speed, and the treated livestock excrements are high in solid recovery rate, low in heat value reduction and high in dehydration degree.

Description

technical field [0001] The invention relates to the field of livestock and poultry manure treatment, in particular to a method for sterilization, deodorization and deep dehydration of livestock and poultry manure. Background technique [0002] In 2003, the production of livestock and poultry manure in my country was about 3.19 billion tons, which was 3.2 times that of industrial solid waste (1 billion tons) in that year, and the production of livestock and poultry manure was increasing year by year. While the total amount of livestock and poultry manure is large, the degree of intensification of the livestock and poultry breeding industry continues to increase. In 2009, the scale of pigs, dairy cows and laying hens reached 61%, 42% and 79% respectively, which makes the livestock and poultry manure Contradictions with the environment have gradually become prominent, and the adverse effects of livestock and poultry manure on water bodies, soil and atmospheric environments have...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/18C02F11/12
Inventor 袁兴中肖智华陈晓红蒋龙波李辉郭晶晶曹亮曾光明
Owner HUNAN UNIV
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