Heavy metal pollution cultivated soil conditioner and preparing method and application thereof

A technology of arable soil and conditioner, which is applied in the field of compound pollution control and restoration of heavy metal cadmium and arsenic in arable soil, which can solve the problems of reducing the activity of beneficial trace elements, imbalance of farmland microbial population, and reducing the utilization rate of plant fertilizers, etc., to achieve the reduction of heavy metals The content of cadmium and arsenic, the effect of achieving transfer inhibition and inhibiting absorption transfer

Inactive Publication Date: 2018-04-10
湖南新九方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the limitations and negative effects of applying quicklime to control heavy metals in cultivated land are also obvious: (1) The application of quicklime reduces the activity of heavy metals and also reduces the activity of beneficial trace elements. The imbalance of calcium and magnesium concentrations in the soil will affect the plant's ability to respond to potassium and phosphorus. Absorption, reducing the plant's utilization rate of fertilizer
(2) Excessive application will kill beneficial active bacteria in the soil, and in an alkaline environment with a slightly higher pH, although the mobility of heavy metal cadmium will decrease, the activity of lead and zinc as amphoteric metal elements will increase
(3) There are many impurities in quicklime for industrial use. If the quality control of lime is not properly controlled, it is easy to cause secondary pollution to the soil
And too high sulfide salts in the farmland will lead to the imbalance of the microbial population in the farmland and the reduction of fertility

Method used

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  • Heavy metal pollution cultivated soil conditioner and preparing method and application thereof
  • Heavy metal pollution cultivated soil conditioner and preparing method and application thereof
  • Heavy metal pollution cultivated soil conditioner and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0071] Following examples, except special statement, all adopt following raw material:

[0072] Biochar: The biochar specifically refers to the by-products produced during the secondary processing of agricultural products such as straw and chaff (the content of arsenic is less than 5mg / Kg; the content of cadmium is less than 2mg / Kg; the content of mercury is less than 2mg / Kg ; The content of lead is less than 50mg / Kg; the content of chromium is less than 50mg / Kg), biochar obtained after gradient carbonization. Among them, the anaerobic carbonization temperature gradient requirements for biochar preparation are as follows: after raising the temperature to 100°C at a heating rate of 5°C / min, anaerobic carbonization for 30 minutes, and then raising the temperature to 200°C at a heating rate of 5°C / min Anaerobic dry distillation for 30 minutes, the temperature rises to 400°C at a rate of 5°C / min, then anaerobic dry distillation for 30 minutes, and the temperature rises to 500°C at...

Embodiment 1

[0080] In this example, the polluted farmland soil in a certain area of ​​Zhuzhou City, Hunan Province was selected to conduct potted planting experiments of dryland crops. Since the soil is irrigated with wastewater discharged from surrounding smelters all the year round, and is also affected by the dust fall of the smelter, there is very serious heavy metal pollution, and many elements are seriously exceeding the standard. Three contaminated soil samples were taken to analyze the content of heavy metal cadmium. The average pH of the three samples was around 5.4, and the average cadmium content was 17.6mg / kg. Calculated according to the secondary soil quality standard, the cadmium exceeded the standard by 58.7 times. The average arsenic content is 91.9mg / kg.

[0081] Since the plot is mainly planted as dryland crops, the dryland crops cabbage and celery being planted among them were taken for analysis of the heavy metal cadmium content in the edible parts above the ground. mg / ...

Embodiment 2

[0091] In this example, the polluted cultivated land in a certain area of ​​Zhuzhou City, Hunan Province was selected to carry out the field planting experiment of paddy rice planting. The arable land has been used as a paddy field for many years, and the crops grown are rice twice a year. Due to the impact of sewage discharge from surrounding smelters and atmospheric deposition, there is a certain amount of heavy metal cadmium pollution in the cultivated land. Sampling and analysis of the soil samples of the cultivated land showed that the pH of the surface cultivated soil was 6.9, the cadmium content in it was 2.44mg / kg, and the arsenic content was 21.9mg / kg.

[0092] Carry out conditioner formula design according to the physical and chemical properties such as heavy metal content of this soil and pH value, use respectively 10 parts by weight biochar powder, 45 parts by weight modified apatite powder, 35 parts by weight modified sodium bentonite powder, 10 parts by weight P...

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Abstract

The invention discloses a heavy metal pollution cultivated soil conditioner which comprises 10-30 parts of biological charcoal, 30-50 parts of modified apatite and 10-50 parts of bentonite and furthercomprises sylvite. The invention further provides a preparing method and application of the heavy metal pollution cultivated soil conditioner. By applying the conditioner in cultivated soil, throughthe cooperation of all components and proportion, the bioactive state and chemical mobility of various heavy metals in cultivated soil can be collaboratively reduced, the diffusion risk of heavy metals in the cultivated soil is reduced, the absorption and conversion of crops on heavy metals in the soil are reduced, and safe eating of the crops is realized. The conditioner is wide in application range and can be used for paddy fields, dry lands and other cultivated lands.

Description

Technical field: [0001] The invention relates to the field of compound heavy metal soil pollution control and restoration, especially the compound pollution control and restoration of heavy metal cadmium and arsenic in farmland soil, and belongs to the technical field of environmental and agricultural protection. Background technique: [0002] With the rapid development of modern agriculture and industry in recent decades, the pollution of cultivated land soil has also followed. Heavy metal pollution in farmland soil will cause heavy metals in the soil to enter the biological chain through bioaccumulation, and the agricultural products planted on it will absorb heavy metals in the soil. After humans and animals eat the corresponding agricultural products, heavy metals will be enriched in the body. Level amplification, ultimately affecting human health and safety. [0003] At present, the main means of controlling heavy metal pollution in cultivated land soil is the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K17/12C09K17/04B09C1/08C05G3/04C09K101/00C05G3/80
CPCB09C1/08C05B13/02C09K17/04C09K17/08C09K17/12C09K2101/00C05G3/80C05D5/00C05D9/00C05D1/00
Inventor 成一知吴云纪智慧王伟王英杰
Owner 湖南新九方科技有限公司
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