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Remediation method for heavy metal-contaminated farmland

A repair method and heavy metal technology, applied in the restoration of contaminated soil, chemical instruments and methods, applications, etc., to achieve the effect of reducing the effective state of heavy metals, short repair time, and good repair effect

Inactive Publication Date: 2020-11-27
中节能大地环境修复有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problem of different degrees of drawbacks in the prior art of soil restoration by single use of foreign soil method, plant extraction technology, passivation technology, and agronomic regulation, and provides an optimized restoration method for heavy metal-contaminated farmland

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In a farmland soil, the soil pH is 7.8~8.5, the maximum content of nickel in the soil is 244mg / kg, the maximum content of lead is 197 mg / kg, the maximum content of arsenic is 22 mg / kg, and the maximum content of chromium is 283 The maximum content of mg / kg and cadmium is 3.5 mg / kg, and the content of nickel, lead, chromium, and cadmium in the soil exceeds the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (Trial)" (GB15618-2018) Agricultural Land The soil pollution risk screening value is lower than the soil pollution risk control value of agricultural land;

[0041] The maximum content of nickel in the agricultural products and vegetables produced is 1.43mg / kg, the maximum content of lead is 0.14mg / kg, the maximum content of arsenic is 0.74mg / kg, the maximum content of chromium is 1.58mg / kg, and the maximum content of cadmium is 0.35mg / kg, exceeding the "National Food Safety Standard-Limits of Contaminants in Food" standards;

[0042] P...

Embodiment 2

[0050] In a farmland soil, the soil pH is 6.5~7.7, the maximum content of nickel in the soil is 157mg / kg, the maximum content of lead is 174mg / kg, the maximum content of arsenic is 46 mg / kg, and the maximum content of chromium is 367 mg / kg, the maximum content of cadmium is 1.2mg / kg. The contents of nickel, lead, chromium, and cadmium in the soil all exceed the "Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standards (for Trial Implementation)" (GB15618-2018), and are lower than the agricultural land soil pollution risk control value ;

[0051] The maximum content of nickel in the agricultural products and vegetables produced is 1.52mg / kg, the maximum content of lead is 0.29mg / kg, the maximum content of arsenic is 0.54mg / kg, the maximum content of chromium is 1.23mg / kg, and the maximum content of cadmium is 0.22mg / kg, exceeding the "National Food Safety Standard-Limits of Contaminants in Food" standards;

[0052] Pretreatment of farmland to be repaire...

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PUM

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Abstract

The invention relates to a remediation method for heavy metal-contaminated farmland. The method comprises the following steps: pretreating to-be-remediated farmland; preparing a remediation agent based on the contamination condition of the to-be-remediated farmland; subjecting the remediation agent and the to-be-remediated farmland to mixing and treating for a preset period of time; collecting a soil sample of the to-be-remediated farmland for detection, and conducting adjustment based on a detection result until the effective state concentration of heavy metals in the soil sample is reduced to a preset value; and carrying out agronomic regulation and control on the farmland to be remediated, and after crops are mature, collecting fruit and sending the fruit to a laboratory for detection wherein remediation succeeds when standards are met. According to the method, a passivation technology and an agronomic regulation and control technology are combined, farmland contaminated by nickel,lead, chromium, cadmium and arsenic can be repaired, the effective state of the heavy metals in soil is effectively reduced, it is guaranteed that the content of pollutants in crop fruit is lower thanthe limiting value of all the pollutants in the national standard, remediation time is short, and remediation effect is good.

Description

Technical field [0001] The present invention relates to the technical field of restoration of contaminated soil, in particular to a method for restoration of typical composite heavy metal contaminated farmland. Background technique [0002] As the foundation of crop growth, farmland soil is the main source of plant nutrients. Due to the current extensive use of pesticides and fertilizers and long-term irrigation of sewage, farmland soil has been polluted unprecedentedly. [0003] On the whole, in farmland pollution, heavy metal pollution is more serious, with a contaminated area of ​​up to 2 million hectares, accounting for 1 / 6 of the country’s arable land. At present, the commonly used repair methods for heavy metal contaminated farmland include foreign soil method, plant extraction technology, and passivation. Technology, agronomic control, etc. [0004] However, the project volume of the foreign soil method is huge, the construction cost is high, and the plant extraction technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10C09K17/04C09K101/00
CPCB09C1/08B09C1/105B09C2101/00C09K17/04C09K2101/00
Inventor 杨鹤峰贾水星吴竞宇燕云仲邵立华王姝
Owner 中节能大地环境修复有限公司