Heavy metal passivation method in pig manure aerobic fermentation process

An aerobic fermentation and heavy metal technology, applied in the fields of application, organic fertilizer, organic fertilizer preparation, etc., can solve the problem of high activity of heavy metals, achieve the effect of increasing the content of residue state, accelerating the passivation process, and improving the comprehensive benefits of agriculture

Inactive Publication Date: 2018-07-27
ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a heavy metal passivation method in pig manure aerobic fermentation process in order to solve the problems of high activity of heavy metals in pig manure

Method used

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  • Heavy metal passivation method in pig manure aerobic fermentation process
  • Heavy metal passivation method in pig manure aerobic fermentation process
  • Heavy metal passivation method in pig manure aerobic fermentation process

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The dried corn stalks (the measured C / N ratio is 55.48, the moisture content is 22.71%) are pulverized to a degree of 1 to 3 cm, and used as a conditioner with pig manure (the measured C / N ratio is 15.58, and the moisture content is 66.3%) ) mixed, the moisture content of the mixed material is adjusted to 65%, the C / N ratio is 28.5, and the addition ratio is 9:2; biochar (raw material is sawdust) with 12% pig manure dry matter is added, the carbonization temperature is 400 ° C, and the carbonization time For 2 hours, the mixture is stacked and placed in the fermentation bed. During the heating period (50 ℃) Blast aeration once every 30 minutes. The ventilation time is 5 minutes, and the ventilation volume is 0.2m 3 min -1 m -3 After 20 days of fermentation, take it out of the fermentation bed, put it in the second fermentation field, add the same biochar as the first fermentation, add 1 / 2 of the amount added in the first fermentation, mix well, and turn it every 7 da...

Embodiment 2

[0053] The sun-dried corn stalks (the measured C / N is 45.57, the moisture content is 12.71%) are pulverized to a degree of 1-3 cm, and used as a conditioner and pig manure (the measured C / N is 15.58, the moisture content is 58.53%) Mixing, the moisture content of the mixed material is adjusted to 68.00%, the C / N is 28.52, and the addition ratio is 8:1; add a composite microbial agent with a dry matter of pig manure of 15‰ and 24% biochar (raw material is peanut shells), and carbonize The temperature can be 500°C, and the carbonization time is 2 hours. The mixed material is stacked and placed in the fermentation bed. During the heating period (50°C) is blown every 20 minutes. Aerate once, and blow and aerate once every 30 minutes during the cooling period (3 min -1 m -3 After 20 days of fermentation, take it out of the fermentation bed, put it in the secondary fermentation field, add the same bacterial agent and biochar as the primary fermentation, and add 1 / 3 of the amount ad...

Embodiment 3

[0059] The sun-dried corn stalks (recorded C / N is 51.74, moisture content 13.37%) are pulverized to a degree of 1-3 cm, and used as conditioner and pig manure (recorded C / N is 14.42, moisture content 66.33%) ) mixed, the moisture content of the mixed material is adjusted to 65.00%, the C / N is 26.52, and the addition ratio is 7:1; biological humic acid with a dry matter amount of pig manure of 2.5‰ is added, and the mixed material is stacked and placed in an aerobic fermentation bed During the heating period (50°C), blow and aerate once every 20 minutes; The time is 5min, the ventilation volume is 0.15m 3 min -1 m -3 After 20 days of fermentation, take it out of the fermentation bed, place it in the secondary fermentation field, add the same biological humic acid as that of the primary fermentation, and add 1 / 3 of the amount added in the primary fermentation, mix well, and turn the pile every 4 days , after 30 days of secondary aerobic fermentation, the appearance of the fer...

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Abstract

The invention discloses a heavy metal passivation method in a pig manure aerobic fermentation process. The method includes: evenly mixing pig manure, a conditioning agent and a passivation agent according to a certain proportion, and placing the mixture in a fermentation tank, wherein the water content of the mixture can be 60-70%, and the carbon nitrogen ratio of the mixture can be 25-30; performing primary fermentation under a ventilation condition for a certain period of time; adding a certain quantity of passivation agent into the primary fermentation product, and using natural ventilationand turning to perform aerobic fermentation for a certain period of time. The heavy metal passivation method has the advantages that village and town organic waste such as the pig manure and straw isused as the raw materials to perform aerobic fermentation, technical guidance is provided for the heavy metal passivation in livestock and poultry manure, and heavy metal passivation is accelerated;the domestic waste generated by a large number of villages and towns can be utilized, high-quality organic fertilizer is provided for agricultural production, and agricultural comprehensive benefits are increased.

Description

technical field [0001] The invention relates to a heavy metal passivation technology in the pig manure aerobic fermentation process, belonging to the technical field of rural energy and environmental protection. Background technique [0002] With the rapid development of modern agriculture in my country, the feed for livestock and poultry generally contains high-copper, high-zinc and other trace element additives. The digestion and absorption utilization rate of heavy metals by livestock and poultry is extremely low, and the bio-enrichment effect makes the heavy metal content in feces more than The feed is as high as 2-7 times, and more than 90% of the heavy metals cannot be absorbed by the body and are excreted with the feces. According to statistics, 150,000 to 180,000 tons of trace element additives are used in my country every year, and about 100,000 tons are not used by animals and discharged into the environment with livestock and poultry manure. A large number of stud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05F17/00C05G3/80
CPCC05F3/00C05F17/50C05G3/00C05G3/80C05F11/00C05F11/02Y02W30/40
Inventor 孟海波沈玉君赵立欣张曦周海宾李冉丁巧生
Owner ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
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