A method for repairing heavy metal polluted soil

A technology that pollutes soil and heavy metals, applied in the field of soil remediation, can solve the problems of complicated operation, long time, heavy workload, etc., and achieve the effect of simple construction operation, short processing time, and reduced mobility

Active Publication Date: 2021-08-27
斯蒂芬 Y 周
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have some deficiencies and defects, which are concentrated in: the method for plant adsorption of heavy metals takes a long time and is slow to take effect, and requires farmland to be fallow, which directly affects the normal cultivation of rice; the method for absorbing heavy metals by microorganisms has poor absorption effect, Moreover, there are potential hidden dangers to the safety and stability of long-term cultivation of farmland; the use of chemical substances to absorb heavy metals or change the form of heavy metals may cause secondary pollution of the soil, which will affect the normal farming function of the soil; after the heavy metals are reduced and stabilized, when When chemical fertilizers or pesticides are used, it is easy to restore the original state
By changing the agronomy and using lime to increase the pH value of the soil and keep the paddy field covered with water, the operation is complicated and it is easy to cause soil compaction, which will affect the grain yield.
Soil replacement by physical methods is basically not feasible due to the heavy workload and high cost

Method used

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  • A method for repairing heavy metal polluted soil
  • A method for repairing heavy metal polluted soil
  • A method for repairing heavy metal polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a method for remediating heavy metal-contaminated soil, said method comprising the following steps:

[0044] (1) Soil pretreatment: introduce irrigation water to cover the heavy metal-contaminated farmland soil, the irrigation water depth is 5 cm, and turn it into muddy soil by repeated plowing;

[0045] (2) Preliminary repair: Spray oxalic acid and seaweed organic polymer oxidant into the muddy soil formed in step (1) respectively, plow it again and again, leave it for 72 hours to form a preliminary repair soil, and repeat the above preliminary repair process 4 times;

[0046] (3) Further repair: keep the soil surface water depth 5 cm, add seaweed organic polymer energy agent to the preliminary repair soil formed in step (2), plow it repeatedly, let stand for 100 minutes, make the soil and water weakly alkaline, pH is 7.5;

[0047] (4) Stabilization and topdressing: after further restoration in step (3), let stand for 6.5 days, and top...

Embodiment 2

[0049] The present embodiment provides a method for remediating heavy metal-contaminated soil, said method comprising the following steps:

[0050] (1) Soil pretreatment: cofferdam water storage, introduction of irrigation water to cover the heavy metal-contaminated paddy field soil, the surface water depth is 5 cm, after the water storage is completed, the pH and ORP indicators of the water and soil are tested, and the results show that: water and soil The pH of the rice field is 5.5, and the ORP is in line with the normal ORP index of the soil; repeated plowing 3 times to ensure that the plowing depth is 40 cm to make it into a muddy soil; if mechanical plowing is used, the plowing time of each mu of paddy field shall not be less than 30 minutes;

[0051] (2) Preliminary restoration: The total volume of the treated soil is obtained by multiplying the area of ​​the treated soil by the depth of soil plowing (excluding the surface water storage depth), and the amount of organic...

Embodiment 3

[0056] Such as figure 1 As shown, the present embodiment provides a method for remediating heavy metal-contaminated soil, the method comprising the following steps:

[0057] (1) Soil pretreatment: cofferdam water storage, introduction of irrigation water to cover the heavy metal-contaminated paddy field soil, the surface water depth is 5 cm, after the water storage is completed, the pH and ORP indicators of the water and soil are tested, and the results show that: water and soil The pH of the rice field is 5.5, and the ORP is in line with the normal ORP index of the soil; repeated plowing 3 times to ensure that the plowing depth is 40 cm to make it into a muddy soil; if mechanical plowing is used, the plowing time of each mu of paddy field shall not be less than 30 minutes;

[0058] (2) Preliminary restoration: The total volume of the treated soil is obtained by multiplying the area of ​​the treated soil by the depth of soil plowing (excluding the surface water storage depth)...

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Abstract

The invention relates to a method for repairing heavy metal polluted soil, which uses organic acid and seaweed organic polymer oxidant to realize the reduction and transformation of heavy metal in soil, and uses seaweed organic polymer energy agent to realize heavy metal flocculation and sedimentation. Beneficial effects of the present invention: the method for repairing heavy metal-contaminated soil can effectively change the form of heavy metals, increase the ratio of their stable state, reduce their mobility, solubility and biological effectiveness; fully use organic substances to restore and stabilize heavy metals in farmland soil Pollutants, especially the heavy metal cadmium and hexavalent chromium, do not damage the function of soil cultivation, have no side effects of soil compaction, and do not produce secondary pollution; the treatment time is short, the effect is quick, and the operation is easy. It is suitable for paddy fields and dry fields, especially for cadmium Pollution of rice fields.

Description

technical field [0001] The invention belongs to the technical field of soil treatment, and in particular relates to a method for repairing heavy metal polluted soil. Background technique [0002] Heavy metals are pollutants in the ecological environment that have great potential harm to humans and other lives. It is basically not decomposed by microorganisms in the environment. On the contrary, when heavy metals are soluble and mobile, they can migrate to organisms such as animals and plants. Heavy metals can migrate through water and soil to the crops and plants eaten by humans and animals. Once humans and animals consume these crops and plants containing heavy metals, it will be very harmful. The scientific community has already proved the hazards of heavy metals, and has been seeking various effective methods to solve the problem of heavy metals in soil. The horror of heavy metal pollution also lies in its potential and long-term harm. In the initial stage of heavy meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 斯蒂芬·Y·周刘国选
Owner 斯蒂芬 Y 周
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