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Method for remediating acidic heavy metal polluted soil by using compound amendment

A technology for polluted soil and acidic soil, applied in the field of remediation of polluted soil, can solve the problems of low remediation efficiency, high remediation cost, and high cost, and achieve the effect of improving properties and fertility, low remediation cost, and good fixation effect

Inactive Publication Date: 2017-07-07
龙善环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The guest-soil method has a large amount of engineering and high cost, and only removes the polluted soil from the polluted area and replaces it with clean soil or improved soil from other places, without substantially treating pollutants; The risk is high, and the problem of secondary pollution brought to the soil has been paid more and more attention. The remediated soil still needs further treatment or improvement before it can be used in agriculture; Soils that are markedly acidic, remedial plant selection and growth are very difficult
[0004] To sum up, for the remediation of heavy metal pollution in acidic soil, the existing technology has defects such as high remediation cost, high environmental risk, unusable soil for agricultural production, and low remediation efficiency. It is urgent to develop feasible remediation methods to It is necessary to reduce the uptake of heavy metals by plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Laboratory simulation of remediation experiments on acidic low-concentration lead-zinc polluted soil

[0016] 1. Collect 2 kg of meadow brown soil, air-dry and crush the soil, pass through a 2 cm sieve, the soil pH is 6.94, the organic matter content is 3.66%, the available phosphorus content is 4.49 mg / kg, the Pb content is 22.56 mg / kg, and the Zn content is 18.78 mg / kg. Add 1.60g Pb(NO3)2 and 4.42g ZnSO4˙7H2O to the soil, spray dilute hydrochloric acid aqueous solution to mix well, make the soil pH 4.4~5.0, and keep the field water capacity of the soil at 55%, the obtained lead and zinc contents are respectively 500mg / kg of experimental soil. After the soil was aged for one month, the measured soil available Pb content was 59.12mg / kg, available Zn content was 68.24mg / kg, and the pH value was 4.92. Take 1kg of the aged soil, air-dry and crush it, and pass it through a 4cm sieve for later use.

[0017] 2. Add calcium oxide with a particle size of 0.2cm to t...

Embodiment 2

[0020] Example 2: Laboratory simulation of remediation experiment of acidic high-concentration lead-zinc polluted soil

[0021] 1. Collect 2 kg of meadow brown soil, air-dry and crush the soil, pass through a 2 cm sieve, the soil pH is 6.94, the organic matter content is 3.66%, the available phosphorus content is 4.49 mg / kg, the Pb content is 22.56 mg / kg, and the Zn content is 18.78 mg / kg. Add 4.81g Pb(NO3)2 and 13.26g ZnSO4˙7H2O to the soil, spray dilute hydrochloric acid aqueous solution to mix well, make the soil pH 4.4~5.0, and keep the field water holding capacity of the soil at 55%, and obtain the heavy metal Pb and Zn content Respectively about 1500mg / kg of experimental soil. After the soil was aged for one month, the measured soil available Pb content was 157.65 mg / kg, available Zn content was 147.60 mg / kg, and the pH value was 4.87. Take 1kg of the aged soil, air-dry and crush it, pass through a 2cm sieve,

[0022] 2. Take the crushed soil, add calcium oxide with a ...

Embodiment 3

[0025] Embodiment 3: Remediation experiment of acidic lead-zinc polluted soil

[0026] 1. Collect 1 kg of lead-contaminated soil in a lead-zinc smelting area, soil pH 4.85, Pb content 892.56 mg / kg, Zn content 1225 mg / kg, soil organic matter content 2.66%, available phosphorus content 3.78 mg / kg, available Pb content 98.32 mg / kg, the effective Zn content is 57.12mg / kg. The soil was air-dried and crushed, and passed through a 4cm sieve.

[0027] 2. Add calcium oxide sieved through a 0.3cm sieve to the above soil, the amount of calcium oxide added is 50g, and stir well.

[0028] 3. Add 80g of calcium magnesium phosphate fertilizer to the above soil, stir and spray water during the filling process, and keep the water content at 55% of the field water holding capacity; after the treatment, the soil is aged at room temperature for 40 days, turned over and stirred once every other week, and Add water and keep the water at 60% of the field capacity.

[0029] 4. Add 60 g of sludge f...

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Abstract

The method for repairing acidic heavy metal-contaminated soil with a composite improver relates to a method for repairing contaminated soil. The method includes the following processes: 1) air-dry and crush the acidic soil containing lead and zinc; 2) take the crushed soil, add granular Calcium oxide with a diameter of 0.1-0.5cm; 3) Add 2-10% calcium magnesium phosphate fertilizer to the above soil; after the treatment, the soil is aged at room temperature for 30-45 days, turned over and stirred once every other week, and replenished with water. Keep the water at 50-60% of the field water holding capacity; 4) Add 5-10% sludge fermented fertilizer to the above-mentioned aged soil to obtain the improved soil. In the method, the heavy metal lead and zinc in the soil are treated through the restoration and aging of the chemical modifier, and while the heavy metal pollution is repaired, the properties and fertility of the soil are improved, ensuring that the repaired soil can be used for normal agricultural and forestry production.

Description

technical field [0001] The invention relates to a method for remediating polluted soil, in particular to a method for remediating acidic heavy metal polluted soil by using a composite improver. Background technique [0002] Soil heavy metal pollution is one of the main environmental pollution problems facing our country. Metal mining and smelting, chemical industry production, heavy metal pesticides, sewage irrigation, and solid waste such as waste slag dissolve and diffuse into the soil are the main ways of heavy metal pollution. The situation of soil heavy metal pollution in my country is severe. In recent years, heavy metal pollution incidents in my country's soil have occurred frequently, which not only poses a serious threat to the quality of cultivated land and agricultural products, but also directly damages the health of the people and affects social stability. The "Twelfth Five-Year Plan" for the Comprehensive Prevention and Control of Heavy Metal Pollution approve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 王洪李海波王士满马军冠廖伯儒
Owner 龙善环保股份有限公司
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