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A passivator for reducing the activity of heavy metals in livestock and poultry manure and its application

A technology of livestock and poultry manure and passivating agent, which is applied in the application, preparation of organic fertilizers, agriculture, etc., can solve the problems of reduced utilization efficiency, secondary pollution, and restricted application, so as to prevent agglomeration effect, improve utilization efficiency, and high The effect of reactivity

Active Publication Date: 2020-03-27
沃邦环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used chemical fixatives are divided into several categories such as natural minerals, organic matter, lime, and replacement metals. These chemical fixatives have the following problems: the fixation efficiency of natural mineral fixatives for heavy metals is low; When the agent is used for the passivation of heavy metals, there is secondary pollution; lime-based fixatives usually change the pH of the medium to make heavy metals form hydroxides and carbonates. After the fixative containing lime-based components is added to the medium, it will cause After repairing, the medium is hardened and expanded, and the fixing effect of heavy metals in the medium is easily affected by the external environmental conditions. In the acidified environment, the presence of heavy metals in the medium Potential hazard of redissolution
However, the cost of submicron or nanometer iron is high, and it is easily oxidized by the surrounding medium (such as dissolved oxygen, water), resulting in a decrease in its utilization efficiency; in addition, the transfer of nanometer zero-valent iron in non-porous media is very slow, which further limits its use. Application in heavy metal passivation

Method used

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  • A passivator for reducing the activity of heavy metals in livestock and poultry manure and its application
  • A passivator for reducing the activity of heavy metals in livestock and poultry manure and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Passivator for Reducing Heavy Metal Activity in Livestock and Poultry Manure

[0023] (1) Preparation of solid conditioner: uniformly mix fly ash, phosphogypsum and red mud according to a weight ratio of 48:27:22 to obtain a solid conditioner;

[0024] (2) Preparation of liquid stabilizer: under nitrogen atmosphere and mechanical stirring (rotating speed 400r / min), rhamnolipid solution (2g / L) and FeCl 3 After the solution (0.2mol / L) was fully mixed, it was added dropwise with FeCl 3 solution with an equal volume of NaHB 4 Solution (0.4mol / L) was reacted, and after the bubbles were no longer generated, the reaction was completed, and the rhamnolipid-coated zero-valent nano-iron suspension was obtained, which was sealed and stored at room temperature.

[0025] figure 1 The scanning electron microscope image of the rhamnolipid-coated zero-valent nano-iron suspension prepared for this example, it can be seen from the figure that the zero-valent nano-iron p...

Embodiment 2

[0032] Preparation of Passivator for Reducing Heavy Metal Activity in Livestock and Poultry Manure

[0033] (1) Preparation of solid conditioner: uniformly mix fly ash, phosphogypsum and red mud according to a weight ratio of 45:26:25 to obtain a solid conditioner;

[0034] (2) Preparation of liquid stabilizer: under nitrogen atmosphere and mechanical stirring (rotating speed 500r / min), rhamnolipid solution (3g / L) and FeCl 3 After the solution (0.25mol / L) was fully mixed, it was added dropwise with FeCl 3solution with an equal volume of NaHB 4 Solution (0.5mol / L) was reacted, and after the bubbles were no longer generated, the reaction was completed, and the rhamnolipid-coated zero-valent nano-iron suspension was obtained, which was sealed and stored at room temperature.

[0035] Application for passivation of heavy metals in chicken manure

[0036] Add the passivating agent used in this example to reduce the activity of heavy metals in livestock and poultry manure to the c...

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Abstract

The invention discloses a passivating agent for reducing activity of heavy metals in livestock and poultry excrement and application of the passivating agent. The passivating agent for reducing activity of the heavy metals in the livestock and poultry excrement is made by mixing of a solid-state conditioner and a liquid-state stabilizer; the solid-state conditioner is prepared from, by weight, 40-55 parts of coal ash, 20-35 parts of ardealite and 15-30 parts of red mud; the liquid-state stabilizer is rhamnolipid dispersed zero-valence nano iron suspension. The passivating agent for reducing activity of the heavy metals in the livestock and poultry excrement has advantages of low cost, effectiveness, high efficiency, environmental friendliness and the like.

Description

technical field [0001] The invention relates to the technical field of organic fertilizer treatment, in particular to a passivator for reducing the activity of heavy metals in livestock and poultry manure and an application thereof. Background technique [0002] With the development of large-scale breeding industry in our country, the pollution of poultry and livestock excrement to the surrounding environment is becoming more and more prominent. It is necessary to strengthen the pollution control of poultry and livestock manure in large-scale farms. Livestock manure is rich in a large amount of N and P elements, and it is the best fertilizer resource for crop growth. Therefore, composting livestock manure is the most effective and common treatment method. However, at present, feed generally contains high doses of trace elements such as copper, zinc, selenium, etc. needed to promote the growth and development of poultry and livestock. The harm to animals, plants and human bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F17/80C05G3/00
CPCC05F3/00C05F17/80C05G3/00Y02W30/40
Inventor 刘军亮
Owner 沃邦环保有限公司
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