Composting process capable of effectively decreasing heavy-metal activity of farm manure

A composting method and farmyard manure technology, applied in the preparation of organic fertilizers, organic fertilizers, agriculture, etc., can solve the problems of soil and crop pollution, impact on health, high toxicity, etc., and achieve simple process, easy popularization and application, and high conversion rate high effect

Inactive Publication Date: 2012-10-03
YUNNAN ACAD OF TOBACCO AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, farmyard manure contains heavy metal elements such as Cu, Zn, Pb, Cd, and As, among which As, Pb, and Cd are non-essential elements for humans and organisms, and are highly toxic. Long-term large-scale application of farmyard manure will cause soil and crop damage. Polluted by As, Pb, Cd, affecting people's health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0019] The animal manure is one or a mixture of pig manure, cow manure, sheep manure, horse manure or poultry manure. The poultry includes chickens, ducks and geese, as well as domestic birds.

[0020] The crop straw is one or a mixture of corn, rice, wheat, sorghum and bean straw.

[0021] The passivating agent is one or a mixture of bentonite, diatomaceous earth, phosphate rock powder, zeolite and sepiolite.

[0022] The decomposing agent is composite bacteria HM and / or composite bacteria EM.

[0023] The ratio of the diameter of the bottom of the compost heap to the height of the compost heap is 1:0.8-1.5.

[0024] The turning over of the pile is carried out in the cool sun for 1 to 2 hours at the same time, and the inner layer and the outer layer of the pile are turned over to ensure uniform and sufficient fermentation.

[0025] If the temperature in the heap is lower than 50°C after two weeks of fermentation, you can add decomposing agent for the second time while turn...

Embodiment 1

[0027] Take the pig manure to remove stones, tiles and other sundries, and store it in a centralized manner for later use; crush the corn stalks to a particle size of 0.5-1.0 cm, and wet them with water for later use; add corn stalk scraps according to 34% of the weight of the pig manure, Mix while spraying water, so that the moisture content reaches 45~55%, hold tightly with your hands to form a ball, and loosen it when you let go. Add 5% bentonite and 0.5% compound bacteria HM by weight, mix evenly and store them together; the ratio of the bottom diameter of the compost heap to the height of the compost heap is 1:0.8; the compost heap is covered and sealed with plastic film, and the surrounding area is compacted with heavy objects Post-stack retting for 21 days; measure the temperature inside the compost heap every 3 days, turn over the compost when the temperature reaches above 70°C, and cool the compost for 1 hour while turning over the compost. After the compost retting i...

Embodiment 2

[0029] Take the cow dung to remove stones, tiles and other sundries and then store it in a centralized manner for later use; crush the bean straw to a particle size of 0.5~1.0cm and wet it with water for later use; add crushed bean straw according to 15% of the weight of the cow dung Mix the ingredients while spraying water to make the moisture content reach 45~55%. At the same time, add diatomaceous earth with a weight ratio of 9% and 0.9% compound bacteria EM, mix them evenly, and store them together; the ratio of the diameter of the bottom of the compost pile to the height of the compost pile is 1:1.5; the compost pile is covered and sealed with a plastic film, and the surrounding area is covered with heavy After the compost is compacted, the compost is retting for 56 days; the temperature in the compost heap is measured every 2 days, and when the temperature reaches above 70°C, the compost is turned over, and the compost is turned over and cooled for 2 hours at the same tim...

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Abstract

The invention discloses a composting process capable of effectively decreasing heavy-metal activity of farm manure. The composting process includes: adding 15%-34% of straw chips by weight of animal excrement, spraying water until the water content reaches 45%-55%, adding 5%-9% of passivators and/or 0.5%-0.9% of decomposing agents by weight ratio and then uniformly mixing and stockpiling; covering and stockpiling with plastic films for 21-56 days; measuring internal temperature of the composed pile each one to three days, and then turning when the temperature reaches 70 DEG C above. By means of adding straws, the passivators and the decomposing agents in livestock excrement to stockpile in a concentrated manner, occurrence states of heavy metals in farm manure can be changed, high-activity exchangeable As and Pb of the heavy metal are changed to be reducible, oxidable and residual with low activity, and accordingly quantity of metal absorbed by plants in farm manure is lowered and organic manure can be utilized for ecological agriculture positively. In addition, the composting process is easy and convenient to implement, environment-friendly and easy to popularize and apply since low-activity conversion rate of heavy metal is high.

Description

technical field [0001] The invention belongs to the technical field of farmyard manure processing, and in particular relates to a composting method which has a simple process and can effectively reduce the activity of heavy metals in farmyard manure. Background technique [0002] "A flower in a crop depends entirely on dung", which shows that fertilizer is the basis for the growth and development of crops. Since the advent of chemical fertilizers, it has brought about tremendous changes in agricultural production and farming methods. However, improper farming methods and extensive use of chemical fertilizers have led to the deterioration of the soil ecological environment, which has reduced the productivity of the land and threatened the sustainable development of agriculture. With the improvement of people's awareness of ecological environment, organic agricultural production is increasingly favored and welcomed by people, and farmyard manure has begun to be reused. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/00
CPCY02W30/40
Inventor 李军营马二登马俊红邓建华
Owner YUNNAN ACAD OF TOBACCO AGRI SCI
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