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Compound method for restoring soil polluted by heavy metal

A technology for remediating soil and heavy metals, which is applied in the field of contaminated soil treatment. It can solve the problems of single heavy metal remediation elements, low heavy metal absorption efficiency, and long remediation time. It achieves low planting difficulty, improved soil physical and chemical properties, and good results.

Active Publication Date: 2015-12-09
深圳园林股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 2. To overcome the problems of low heavy metal absorption efficiency of resistant crops, single heavy metal repair elements, too long repair time, and low survival rate

Method used

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  • Compound method for restoring soil polluted by heavy metal

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Effect test

Embodiment 1

[0041] A compound method for remediating soil heavy metal pollution, comprising the following steps:

[0042] 1) In spring, apply urea and potassium dihydrogen phosphate to the heavy metal-contaminated soil as base fertilizer, and pour the heavy-metal-contaminated soil once and for all;

[0043] 2) The seeds of Chlorophytum were treated with 15% H 2 o 2 Disinfection treatment, then wash and soak in distilled water for 10 hours, cultivate Chlorophytum seeds with plump and non-sinking seeds at 20°C, and cover the seeds with 0.4cm of soil. After 8 days, select seedlings with 3 leaves and bury them at an angle of 28 degrees in the vertical direction. Step 1) The depth of the heavy metal-contaminated soil surface is 3cm thick, the plant-to-plant spacing is 15cm, and the row spacing is 20cm;

[0044] 3) Water according to the water shortage of the heavy metal polluted soil to keep the soil water content at 50%, and remove the Chlorophytum as a whole after 95 days;

[0045] 4) Bio...

Embodiment 2

[0055] A compound method for remediating soil heavy metal pollution, comprising the following steps:

[0056] 1) In spring, apply N, P, K-containing urea and potassium dihydrogen phosphate as base fertilizer to the heavy metal-contaminated soil, and pour the heavy metal-contaminated soil once and for all;

[0057] 2) Use cuttings to plant Chlorophytum, select seedlings with 4 leaves, and bury them at an inclination of 28 degrees. Step 1) The surface layer of heavy metal-contaminated soil is 5 cm thick, the plant spacing is 19 cm, and the row spacing is 24 cm;

[0058] 3) Water according to the water shortage of the heavy metal polluted soil to keep the soil water content at 56%, and remove the Chlorophytum as a whole after 91 days;

[0059] 4) Prepare biochar by using the waste of Chlorophytum Chlorophytum, mix the obtained biochar with dilute hydrochloric acid with a mass fraction of 10% and dilute nitric acid with a mass fraction of 5% at a volume ratio of 2:1, pickle for 2 ...

Embodiment 3

[0069] A compound method for remediating soil heavy metal pollution, comprising the following steps:

[0070] 1) In spring, apply N, P, K-containing urea and potassium dihydrogen phosphate as base fertilizer to the heavy metal-contaminated soil, and pour the heavy metal-contaminated soil once and for all;

[0071] 2) The Chlorophytum seeds were treated with 20% H 2 o 2 Disinfection treatment, then wash and soak in distilled water for 12 hours, cultivate spider plant seeds with full grains and no sinking at 23°C, cover the seeds with 0.6cm of soil, after 11 days, select seedlings with 6 leaves, and bury them at the same time while tilting at 28 degrees 2) The depth of the surface layer of heavy metal polluted soil is 6cm thick, the distance between plants is 25cm, and the distance between rows is 28cm;

[0072] 3) Water according to the water shortage of the heavy metal polluted soil to keep the soil water content at 56%, and remove the Chlorophytum as a whole after 91 days; ...

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Abstract

The invention provides a compound method for restoring soil polluted by heavy metal. The compound method comprises the following steps that bracketplant is planted in the soil polluted by the heavy metal, and the bracketplant is overall removed after 85-95 days; a mixture of biological carbon base fertilizer and heavy metal activated bacterium liquid is applied into the soil; sugarcane is planted in the soil polluted by the heavy metal, the bracketplant is continuously planted next spring, the bracketplant is overall removed after 85-95 days and the sugarcane is overall removed in August or September; a mixture of the biological carbon base fertilizer and the heavy metal activated bacterium liquid is applied into the soil and mixed evenly, and seasoning is conducted for 75-80 days; and the steps from the first step to the fifth step are executed circularly and repeatedly until the content of the heavy metal in the soil is up to the safety standard. According to the compound method, the heavy metal absorption efficiency of plants is improved and the soil remediation effect is good; in addition, the compound method has the characteristics of being friendly to the environment, free of secondary pollution, high in practicability and the like.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a composite method for repairing heavy metal pollution in soil. Background technique [0002] Soil pollution is caused by excessive harmful substances contained in the soil, exceeding the self-purification capacity of the soil, which causes changes in the composition, structure and function of the soil. Harmful substances gradually accumulate in the soil, through "soil→plant→human body", Or it can be indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health. Soil heavy metal pollution mainly includes mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) with significant biological toxicity, as well as zinc (Zn), copper ( Cu), nickel (Ni) and other elements, heavy metal pollution elements have poor mobility in the soil, long residence time, can only undergo morphological transforma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 马新攀
Owner 深圳园林股份有限公司
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