Cadmium-contaminated paddy field soil remediation agent and preparation method and application thereof

A technology for cadmium-contaminated soil and contaminated soil, applied in the field of soil remediation agents, can solve problems such as reducing cadmium content in crops, and achieve the effects of improving crystal structure, saving use costs, and increasing adsorption performance

Inactive Publication Date: 2017-07-14
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects of the existing cadmium-contaminated crop soil remediation technology, an object of the present invention is to provide a kind of good stability, which can efficiently absorb and fix free cadmium ions in paddy field cadmium-contaminated soil, reduce the cadmium content of crops, and do not destroy the original Restorative agent that has ecological environment and soil structure, improves soil fertility, and increases crop yield

Method used

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  • Cadmium-contaminated paddy field soil remediation agent and preparation method and application thereof
  • Cadmium-contaminated paddy field soil remediation agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the following recipes 1 to 6,

[0040] Clay minerals were dried at 105°C, ground and pulverized, passed through an 80-mesh sieve, and the under-sieve was taken.

[0041] After the activated carbon filter element of the discarded water purifier is dried and crushed at 105°C, it is passed through a 150-mesh sieve, and the under-sieve is taken.

[0042] The RO membrane in the discarded water purifier is acid-washed, washed with water, dried at 105°C, ground and pulverized, passed through a 150-mesh sieve, and the under-sieve is taken.

[0043] The organic fertilizer is obtained by composting a mixture of white clover and rice straw in a mass ratio of 1:1.

[0044] Formula 1: 100 parts of medical stone, 7 parts of granular activated carbon filter element powder, 10 parts of discarded water purifier RO membrane powder, 0.6 part of calcium oxide, and 5 parts of organic fertilizer.

[0045] Formula 2: 100 parts of attapulgite powder, 24 parts of activated carbon T33 filte...

Embodiment 2

[0058] Formula 3: 100 parts of sepiolite powder, 14 parts of front granular activated carbon filter powder, 7 parts of waste water purifier RO membrane powder, 1.2 parts of calcium oxide, 7 parts of organic fertilizer.

[0059] The above formula 3 prepares the soil remediation agent:

[0060] A: Disperse the waste water purifier activated carbon filter powder and clay mineral powder in water, the liquid-solid ratio is 1:5g / mL, use sulfuric acid to adjust the pH of the solution system to 3.5, then transfer it to a hydrothermal reaction kettle, and heat it at a temperature of 130°C The hydrothermal reaction was carried out under low temperature for 15 hours, separated by filtration, and the solid product was washed with a large amount of water, and then dried with hot air at a temperature of 110°C. The dried product was placed in a nitrogen atmosphere and calcined at a temperature of 520°C for 2.5 hours. The calcined product and the discarded water purifier The RO membrane powde...

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Abstract

The invention discloses a cadmium-contaminated paddy field soil remediation agent and a preparation method and application thereof. The cadmium-contaminated paddy field soil remediation agent comprises the following components: clay mineral powder, waste water purifier activated carbon filter element powder, waste water purifier RO membrane powder, a pH regulator and an organic fertilizer; the preparation method comprises the following steps: dispersing waste water purifier activated carbon filter element powder and clay mineral powder in water, regulating the pH to be 2-5, transferring the mixture to a hydrothermal reactor for hydrothermal reaction, placing the hydrothermal reaction products in a protective atmosphere for calcining, mixing the calcined products, waste water purifier RO membrane powder, the pH regulator and the organic fertilizer, so as to obtain the cadmium-contaminated paddy field soil remediation agent. The cadmium-contaminated paddy field soil remediation agent is good in stability, effectively adsorbs and immobilizes free cadmium ions in the cadmium-contaminated paddy field soil, reduces the cadmium content of crops, does not destroy the original ecological environment or the soil structure, improves the soil fertility, and further increases the crop yield.

Description

technical field [0001] The invention relates to a soil remediation agent, in particular to a remediation agent for cadmium-contaminated soil in paddy fields, a preparation method and application thereof, and belongs to the cadmium-contaminated soil remediation technology. Background technique [0002] Soil heavy metal pollution refers to the phenomenon that human activities bring heavy metals into the soil, causing the content of heavy metals in the soil to be significantly higher than its natural background value, and causing ecological damage and environmental quality deterioration. With the rapid growth of population and the continuous expansion of industrial and agricultural production, the situation of heavy metal pollution in soil is becoming more and more serious, and the problems caused by it are becoming more and more prominent, which has become a serious environmental problem facing the world. Heavy metal pollution not only changes the physical, chemical and biolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40
Inventor 刘登彪刘晓月史学峰李娟李顺峰刘卫国苗雪雪
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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