Widely-applicable high-efficiency nondestructive method for repairing heavy metal polluted farmland in situ

An in-situ remediation and heavy metal technology, which is applied in the field of contaminated soil remediation, can solve the problems of easy corrosion and decomposition of straw ropes, safety risks, and changes in soil micro-ecological systems, so as to achieve safe and reliable implementation, low investment and operation costs, and increased soil pollution. The effect of fertility

Active Publication Date: 2017-01-04
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the invention patent (Application No. 201410358118.1) adopts irrigation soaking, soil heavy metal desorbent (organic complexing agent) to analyze soil heavy metals, attapulgite adsorption, and electric separation method to separate attapulgite and other steps to control heavy metals, and the treatment effect copper removal rate is about 82%. , lead about 55%; at the same time, artificial organic complexing agent, attapulgite powder, etc. are added to the soil, among which the organic complexing agent cannot be recovered and remains in the soil, and some attapulgite powder can be recovered by electric separation, but there will still be residual On the one hand, the above-mentioned substances will destroy the composition and properties of the soil; on the other hand, the environmental and ecological risks of the added chemical substances have not been evaluated, and there is a trend of new soil pollution; in addition, this method has a large amount of engineering, and at the same time, the electric separation method is used to recover the attapulgite Not only the cost of use is high, but also there are security risks
Invention patents (application numbers 201410285259.5, 201510186798.8) use steps such as sampling, analysis, weeding and soaking, activation, displacement adsorption, stirring and magnetic absorption, and centralized collection to control heavy metals in farmland; , and will not be recycled, and all remain in the soil. On the one hand, the addition of the above substances

Method used

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  • Widely-applicable high-efficiency nondestructive method for repairing heavy metal polluted farmland in situ
  • Widely-applicable high-efficiency nondestructive method for repairing heavy metal polluted farmland in situ
  • Widely-applicable high-efficiency nondestructive method for repairing heavy metal polluted farmland in situ

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Step 1: plow the surface soil of the farmland polluted by heavy metals to a depth of 30 cm, and build a field ridge with a depth of 30 cm, a width of 40 cm, and a field ditch of 30 cm;

[0033] Step 2: Use local water sources as irrigation water, use phosphoric acid to adjust the pH value of the irrigation water to 4.0, use it to irrigate the polluted farmland, submerge the field ridges to a height of 10 cm, and soak for 3 days;

[0034] Step 3: Arrange a movable adsorption module every 2m in each field ditch. The movable adsorption module is composed of a support rope, a fixed ring, and a detachable adsorption capsule. The detachable adsorption capsule has a particle size of 0.5mm 、Specific surface area≥1000m 2 Composed of / g activated carbon and gauze bag, the detachable adsorption capsule is installed at a depth of 15cm from the water surface, and at the same time starts the internal circulation of the soaking water in the farmland, so that the soaking water is in a ...

Embodiment 2

[0040] Step 1: plow the surface soil of the farmland polluted by heavy metals to a depth of 35 cm, and build a field ridge with a depth of 30 cm, a width of 40 cm, and a field ditch of 30 cm;

[0041] Step 2: Use local water sources as irrigation water, use phosphoric acid to adjust the pH value of the irrigation water to 5.0, use it to irrigate the polluted farmland, submerge the field ridges to a height of 10 cm, and soak for 5 days;

[0042] Step 3: Arrange a movable adsorption module every 2m in each field ditch. The movable adsorption module is composed of a support rope, a fixed ring, and a detachable adsorption capsule. The detachable adsorption capsule consists of a particle size of 1mm, Specific surface area ≥ 1500m 2 / g Activated carbon fiber and gauze bag. The detachable adsorption capsule is installed at a depth of 15cm from the water surface. At the same time, the internal circulation of the soaking water in the farmland is started to make the soaking water flow s...

Embodiment 3

[0048] Step 1. Plow the surface soil of the farmland polluted by heavy metals to a depth of 40 cm, and build a field ridge with a depth of 30 cm, a width of 40 cm, and a field ditch of 30 cm;

[0049] Step 2: Use local water sources as irrigation water, use phosphoric acid to adjust the pH value of the irrigation water to 6.0, use it to irrigate the polluted farmland, submerge the field ridges to a height of 10 cm, and soak for 7 days;

[0050] Step 3: Arrange a movable adsorption module every 2m in each field ditch. The movable adsorption module is composed of a support rope, a fixed ring, and a detachable adsorption capsule. The detachable adsorption capsule consists of a particle size of 3mm, Specific surface area ≥ 500m 2 Composed of / g activated carbon and gauze bag, the detachable adsorption capsule is installed at a depth of 15cm from the water surface, and at the same time starts the internal circulation of the soaking water in the farmland, so that the soaking water i...

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Abstract

The invention discloses a widely-applicable high-efficiency nondestructive method for repairing a heavy metal polluted farmland in situ. The method realizes in-situ nondestructive repair, stabilization and fertility increase of heavy metal polluted farmland soil through steps such as plowing, ridging, water irrigation for soaking, adsorption through movable adsorption modules, soaking water internal circulation, soil stabilization and fertility increase performed to the polluted farmland soil. The method does not need additional additives, does not destruct the soil structure and composition, can realize deep high-efficiency purification of heavy metals of various types and forms, has the advantages of wide application scope, small workload, short treatment period, low cost and the like, and is very applicable to the treatment of the heavy metal polluted farmland soil.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a method for widely suitable, efficient and non-destructive in-situ remediation of farmland polluted by heavy metals. Background technique [0002] At present, my country's cultivated land is seriously polluted by heavy metals, and about one-sixth of the cultivated land in the country is polluted by heavy metals to varying degrees. Among them, Cd, Ni, Pb, etc. are the main heavy metals polluting cultivated land. The above-mentioned heavy metals mainly enter the cultivated land through sewage irrigation, industrial waste discharge, excessive use of pesticides and fertilizers, etc., causing soil heavy metal pollution. Heavy metal pollution in arable land will cause crop yield reduction and excessive heavy metals, which will threaten people's health. In recent years, soil heavy metal pollution incidents have occurred frequently in my country, and ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08A01B79/00
CPCA01B79/00B09C1/00B09C1/08B09C2101/00
Inventor 方平岑超平陈雄波陈定盛唐子君黄建航
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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