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Preparation method of iron-enriched wormcast and application of wormcast in soil pollution control

A vermicompost, iron-rich technology is applied in the restoration of polluted soil, botanical equipment and methods, applications, etc., can solve the problems of inability to achieve synchronous passivation of cadmium and arsenic, limited adsorption, etc., and achieves improved synchronous passivation. effect, reducing effectiveness, enhancing the effect of decomposition and absorption

Active Publication Date: 2019-12-03
ENVIRONMENT & PLANT PROTECTION INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional preparation process of vermicompost, in order to achieve the adsorption effect on heavy metals, the raw materials of minerals and trace elements are usually piled up as vermiculture beds, so that vermicompost can be obtained during the cultivation process, which can be used as organic fertilizer or soil However, it will be affected by raw material processing technology, breeding environment and other factors, often resulting in the inability to effectively introduce minerals and trace elements into vermicompost, and in the process of actual application, the adsorption of heavy metals in the soil by vermicompost Very limited, unable to achieve effective simultaneous passivation of cadmium and arsenic

Method used

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  • Preparation method of iron-enriched wormcast and application of wormcast in soil pollution control
  • Preparation method of iron-enriched wormcast and application of wormcast in soil pollution control
  • Preparation method of iron-enriched wormcast and application of wormcast in soil pollution control

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1-a kind of preparation method of iron-rich vermicompost, comprises the steps:

[0030] Step 1: crushing the iron powder through a 16-mesh sieve to obtain uniform iron powder with a particle size ≤ 1mm;

[0031] Step 2: After the fermented cow dung is naturally air-dried, it is crushed and passed through a 16-mesh sieve to obtain uniform cow dung with a particle size of ≤1 mm;

[0032] Step 3: Add the iron powder material to the cow dung material according to the mass ratio of 5%, mix evenly, and put it into the mixer, keep the temperature of the mixer at 23°C, and the mixing time is 30min, and stir evenly to obtain mixed raw material;

[0033] Step 4: Put the mixed primary material into a square wooden container, spray water into the container, keep the humidity in the container at 60%, and obtain the mixed base material;

[0034] Step 5: Make earthworms with a density of 15,000 / m 2Put it into the square wooden container, and keep the container cool and v...

Embodiment 2

[0037] Embodiment 2-a kind of preparation method of iron-rich vermicompost, comprises the steps:

[0038] Step 1: Grinding the iron powder through a 20-mesh sieve to obtain uniform iron powder with a particle size ≤ 1 mm; the purity of the iron powder is above 80%;

[0039] Step 2: Naturally air-dry the fermented cow dung, and then grind it through a 20-mesh sieve to obtain uniform cow dung with a particle size of ≤1 mm;

[0040] The fermentation of the cow dung is to add 15% sodium bicarbonate to the weight of fresh cow dung and mix evenly, and add 0.05% fermentation bacteria agent to carry out anaerobic fermentation. The fermentation temperature is maintained at 55 ° C, and the fermentation time is 5 days;

[0041] Step 3: Carry out heat treatment to the iron powder, place the iron powder in a nitrogen environment at a temperature of 100°C, heat treat for 5 hours, add the iron powder to the cow dung material in a mass ratio of 10%, mix evenly, and put it in the mixing In th...

Embodiment 3

[0046] Embodiment 3-a kind of preparation method of iron-rich vermicompost, comprises the steps:

[0047] Step 1: Grinding the iron powder through a 16-mesh sieve to obtain uniform iron powder with a particle size ≤ 1 mm; the purity of the iron powder is above 80%;

[0048] Step 2: Naturally air-dry the fermented cow dung, and then grind it through a 16-mesh sieve to obtain uniform cow dung material with a particle size of ≤1 mm;

[0049] The fermentation of the cow dung is to add 20% sodium bicarbonate to the weight of fresh cow dung and mix evenly, and add 0.5% fermentation bacteria agent to carry out anaerobic fermentation. The fermentation temperature is maintained at 60 ° C, and the fermentation time is 10 days;

[0050] Step 3: Add the iron powder material to the cow dung material according to the mass ratio of 20%, mix evenly, and put it into the mixer, keep the temperature of the mixer at 25°C, and the mixing time is 35min, and stir evenly to obtain Mixing the raw mat...

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Abstract

The invention provides a preparation method of iron-enriched wormcast and application of the wormcast in soil pollution control. The method comprises the steps that (1), iron powder is crushed and sieved, and iron powder materials with the particle size being smaller than or equal to 1 mm are obtained; (2), fermented cow dung is naturally air-dried, crushed and sieved, and cow dung materials withthe particle size being smaller than or equal to 1 mm are obtained; (3), the iron powder materials and the cow dung materials are mixed according to the mass ratio being 5-20% and put into a mixer, the temperature is kept to be lower than 30 DEG C, and the mixing time is longer than 20 minutes; (4), earthworms are put into a container, the container humidity is kept at 60-80%; (5), earthworms areput into the container at the density of 15,000-20,000 earthworms / m<2>, the container temperature is 20-30 DEG C, the humidity is 60-80%, breeding is conducted for 3-4 months, and the earthworms convert a mixed matrix into wormcast; (6), the earthworms and wormcast are separated layer by layer: (7), the wormcast is laid flat, naturally air-dried, ground and sieved, the iron-enriched wormcast withthe particle size being smaller than or equal to 2 mm is obtained. Accordingly, iron mineral microelements are effectively introduced into the wormcast, the simultaneous passivation of the wormcast toarsenic and cadmium in soil is achieved, and the passivation effect is more significant; meanwhile, the physical and chemical properties of the soil are improved, the soil quality is improved, and the method has the huge application potential for comprehensive governance of arsenic and cadmium contaminated soil.

Description

technical field [0001] The invention relates, in particular, to a method for preparing iron-rich vermicompost and its application in soil pollution control. Background technique [0002] The problem of soil pollution in my country is serious, among which heavy metals are the primary pollutants in my country's soil. Due to the accompanying phenomena of heavy metals and the influence of atmospheric deposition, heavy metals often present the characteristics of compound pollution. Arsenic and cadmium compound pollution of farmland soil is often reported, especially the problem of arsenic and cadmium pollution in paddy fields. Because rice is a crop rich in arsenic and cadmium, people's dietary intake of arsenic and cadmium has seriously endangered human health. Therefore, the control of soil arsenic and cadmium compound pollution is an urgent problem to be solved in today's soil environment problems. [0003] Passivation remediation is an important remediation method to solve...

Claims

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Application Information

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IPC IPC(8): A01G24/20A01G24/10A01K67/033B09C1/08
CPCA01K67/0332A01G24/10A01G24/20B09C1/08
Inventor 潘攀刘贝贝吴琳符旖晴武春媛李勤奋
Owner ENVIRONMENT & PLANT PROTECTION INST CHINESE ACADEMY OF TROPICAL AGRI SCI