Method for repairing lead-chromium composite contaminated soil by combining humic acid and sudangrass

A chromium-contaminated soil and joint restoration technology is applied in the field of joint restoration of lead-chromium-contaminated soil with humic acid and sudan grass, which can solve the problems of compound pollution and difficult survival of plants, and improve soil and promote crop growth with a simple method Effect

Pending Publication Date: 2020-03-13
HENAN ACAD OF SCI INST OF BIOLOGY LIABILITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The method of the invention is simple, can effectively solve the problems of heavy metal compound pollution, difficult plant survival, etc.,

Method used

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  • Method for repairing lead-chromium composite contaminated soil by combining humic acid and sudangrass

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Effect test

Embodiment 1

[0010] The present invention is a method for jointly repairing lead-chromium-contaminated soil by using humic acid and sudan grass. Humic acid is evenly sprinkled on the surface layer of lead-chromium-contaminated soil at a rate of 150 kg / mu. The soil surface layer contains 275.4 mg / kg of chromium and 989.7 mg / kg of lead. , plow the soil to a depth of 20cm, rake and divide the ridges, and the row spacing between the ridges is 35cm. After 7 days, sow sudan grass seeds evenly in each ridge. The sowing rate is 1.8kg / mu, and the sowing depth is 3cm. During the process, water once every 4-6 days, and manage according to the normal growth requirements of Sudan grass. After 30 days of growth of Sudan grass, soil samples were collected for measurement. The soil lead content was ≤218mg / kg, and the chromium content was ≤95mg / kg, meeting the requirements of national environmental standards. , to achieve the remediation of lead and chromium contaminated soil.

Embodiment 2

[0012] The present invention is a method for jointly repairing lead-chromium-contaminated soil by using humic acid and sudan grass. Humic acid is evenly sprinkled on the surface layer of lead-chromium-contaminated soil at a rate of 110kg / mu. kg, plow the soil to a depth of 21cm, rake it flat, divide the ridges, and the row spacing between the ridges is 38cm. After 7 days, sow sudan grass seeds evenly in each ridge. The sowing rate is 1.6kg / mu, and the sowing depth is 2.8cm. Water once every 4-5 days during the plant growth process, and manage according to the normal growth requirements of Sudan grass. After the Sudan grass grows for 30 days, soil samples are collected for measurement. The soil lead content is ≤218mg / kg, and the chromium content is ≤95mg / kg, which meets the national environmental requirements. Standard requirements, to achieve the remediation of lead and chromium contaminated soil.

Embodiment 3

[0014] The present invention is a method for jointly repairing lead-chromium-contaminated soil by using humic acid and sudan grass. Humic acid is evenly sprinkled on the surface layer of lead-chromium-contaminated soil at a rate of 180kg / mu. kg, plow the soil to a depth of 19cm, rake it flat, divide the ridges, and the row spacing between the ridges is 32cm. After 7 days, sow sudan grass seeds evenly in each ridge. The sowing rate is 1.9kg / mu, and the sowing depth is 3.2cm. Water once every 6-7 days during plant growth, and manage according to the normal growth requirements of Sudan grass. After 30 days of growth of Sudan grass, soil samples are collected for measurement. The soil lead content is ≤218mg / kg, and the chromium content is ≤95mg / kg, which meets the national environmental requirements. Standard requirements, to achieve the remediation of lead and chromium contaminated soil.

[0015] The present invention is through on-the-spot test and test, and effect is very good,...

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Abstract

The invention relates to a method for repairing lead-chromium composite contaminated soil by combining humic acid and sudangrass. The method effectively solves the problem that humic acid reduces thebiological availability of heavy metals lead and chromium, relieves the poisons of the heavy metals lead and chromium to the sudangrass, creates conditions for the growth of sudangrass in moderately and severely contaminated areas, and improves the remediation efficiency of the sudangrass on the lead-chromium composite contaminated soil. Humic acid is uniformly scattered on the surface layer, withthe chromium content of 275.4 mg/kg or above and the lead content of 989.7 mg/kg or above, of the lead-chromium contaminated soil, the soil is plowed, raked and ridged, sudangrass seeds are sowed, watering is conducted once every 3-7 days in the plant growth process, management is conducted according to the normal growth requirement of the sudangrass, the sudangrass grows for 30 days, soil samples are collected and measured, the lead content of soil is smaller than or equal to 218 mg/kg, and the chromium content of soil is smaller than or equal to 95 mg/kg, so the national environmental standard requirements are met, and remediation of the lead-chromium contaminated soil is achieved. The method is simple, can effectively solve the problems of heavy metal combined pollution, difficult survival of plants and the like, and also has the advantages of soil improvement, fertility enhancement, crop growth promotion, low cost and environmental friendliness.

Description

technical field [0001] The invention relates to soil remediation, in particular to a method for jointly remediating lead-chromium composite polluted soil by utilizing humic acid and sudan grass. Background technique [0002] The unreasonable application of pesticides and chemical fertilizers causes soil acidification and compaction, and can activate harmful heavy metal elements in the soil, resulting in excessive heavy metal content in crops, fruit trees, etc., affecting food safety. Lead and chromium are highly toxic heavy metals and internationally recognized carcinogenic metals, which seriously endanger the ecological environment and human health. At present, the established lead and chromium pollution remediation methods mainly include physical, chemical, biological and other methods. Commonly used physical and chemical methods are costly, complicated to operate, and easily cause secondary pollution. Humic acid is a complex natural polymer organic matter, which can imp...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 杨文玲杜志敏雷高王佰涛李珊珊李磊李亮亮刘德海刁文涛甄静陈晓飞王继雯胡宜亮陈国参
Owner HENAN ACAD OF SCI INST OF BIOLOGY LIABILITY
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