Method for restoring sludge land heavy metal contaminated soil

Abstract

The invention provides a method for restoring sludge land heavy metal contaminated soil. The method comprises the following steps: applying charcoal base fertilizer in the soil, uniformly mixing the soil with the charcoal base fertilizer, carrying out ageing, after the ageing, putting earthworms in the soil for cultivation, after introducing the earthworms in the soil normally, planting castor-oil plant and applying the charcoal base fertilizer in the soil simultaneously, after a certain period of time, removing the castor-oil plant overall, putting earthworms in the soil for cultivation, after introducing the earthworms in the soil normally, planting willows and applying the charcoal base fertilizer in the soil simultaneously, after a certain period of time, removing the willows overall, and repeating the steps in a circulating manner until content of heavy metal in the soil reaching the safe standard. With adoption of the method, the restoring treatment effect to the sludge land heavy metal contaminated soil is ideal, the treatment time is short, the territory applicability is wide, and secondary pollution to the soil can be avoided.

Description

technical field

[0001] The invention relates to the field of contaminated soil treatment, in particular to a method for repairing heavy metal contaminated soil in sludge. Background technique

[0002] With the gradual increase of my country's sewage treatment plants and the development of sewage treatment technology, the sludge generated during the sewage treatment process is also gradually increasing. Due to its large size, complex components, high moisture content, low strength, and a large amount of Harmful substances such as pathogenic microorganisms, parasite eggs, and heavy metals, accompanied by stench, these unfavorable factors have brought a lot of inconvenience to its transportation, storage, and subsequent resource utilization. At present, many factories still dump sludge at will. transport, simply landfill or stack, causing damage to the environment.

[0003] Heavy metal pollution in sludge has become an environmental problem of worldwide concern. Heavy metals in...

Examples

Embodiment 1

[0038] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0039] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.2kg / m 2 ;

[0040] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2Disinfection treatment and then washing and soaking in distilled water for 12 hours. The annual castor bean seedlings with plump and sinking seeds grow into healthy seedlings of 30 cm in length and buried in the surface of the soil at a depth of 10 cm at an inclination of 30 degrees in the vertical direction. The plant spacing is 20 cm and the row spacing is 25 cm. In late March, two cycles of annual Tongbi No. 5 castor were continuously planted in the experimental field polluted by heavy metals in sludge. While planting castor, biochar-based fertilizer was applied to the soil, and water...

Embodiment 2

[0047] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0048] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.3kg / m 2 ;

[0049] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2 Disinfection treatment, then washing and soaking in distilled water for 12 hours, the full-grained and sinking annual castor oil No. 5 castor seeds grow into healthy seedlings of 30 cm and are buried in the soil surface at a depth of 10 cm along the vertical direction at an inclination of 30 degrees. The plant spacing is 20 cm, and the row spacing is 25 cm. In late March, two cycles of annual castor oil castor No. 5 were continuously planted in the experimental field polluted by heavy metals in the sludge land. While planting the castor plant, biochar-based fertilizer was applied to the...

Embodiment 3

[0056] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0057] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.2kg / m 2 ;

[0058] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2 Disinfection treatment, then washing and soaking in distilled water for 12 hours, the full-grained and sinking annual castor oil No. 4 castor seeds grow into healthy seedlings of 30 cm and are buried in the soil surface at a depth of 15 cm along the vertical direction at an inclination of 30 degrees. The plant spacing is 25 cm, and the row spacing is 25 cm. In late March, two cycles of annual castor oil castor No. 4 were planted continuously in the experimental field polluted by heavy metals in the sludge land. While planting the castor plant, biochar-based fertilizer was applied to the...

technical field

[0001] The invention relates to the field of contaminated soil treatment, in particular to a method for repairing heavy metal contaminated soil in sludge. Background technique

[0002] With the gradual increase of my country's sewage treatment plants and the development of sewage treatment technology, the sludge generated during the sewage treatment process is also gradually increasing. Due to its large size, complex components, high moisture content, low strength, and a large amount of Harmful substances such as pathogenic microorganisms, parasite eggs, and heavy metals, accompanied by stench, these unfavorable factors have brought a lot of inconvenience to its transportation, storage, and subsequent resource utilization. At present, many factories still dump sludge at will. transport, simply landfill or stack, causing damage to the environment.

[0003] Heavy metal pollution in sludge has become an environmental problem of worldwide concern. Heavy metals in...

Examples

Embodiment 1

[0038] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0039] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.2kg / m 2 ;

[0040] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2Disinfection treatment and then washing and soaking in distilled water for 12 hours. The annual castor bean seedlings with plump and sinking seeds grow into healthy seedlings of 30 cm in length and buried in the surface of the soil at a depth of 10 cm at an inclination of 30 degrees in the vertical direction. The plant spacing is 20 cm and the row spacing is 25 cm. In late March, two cycles of annual Tongbi No. 5 castor were continuously planted in the experimental field polluted by heavy metals in sludge. While planting castor, biochar-based fertilizer was applied to the soil, and water...

Embodiment 2

[0047] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0048] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.3kg / m 2 ;

[0049] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2 Disinfection treatment, then washing and soaking in distilled water for 12 hours, the full-grained and sinking annual castor oil No. 5 castor seeds grow into healthy seedlings of 30 cm and are buried in the soil surface at a depth of 10 cm along the vertical direction at an inclination of 30 degrees. The plant spacing is 20 cm, and the row spacing is 25 cm. In late March, two cycles of annual castor oil castor No. 5 were continuously planted in the experimental field polluted by heavy metals in the sludge land. While planting the castor plant, biochar-based fertilizer was applied to the...

Embodiment 3

[0056] 1) Apply biochar-based fertilizer to heavy metal-polluted soil in sludge land, mix well, and age for 30 days;

[0057] 2) After the aging of the biochar-based fertilizer in step 1), put earthworms into the soil for breeding, and the amount of earthworms put into the soil is 0.2kg / m 2 ;

[0058] 3) After the earthworms are normally introduced into the soil in step 2), choose 20% H 2 o 2 Disinfection treatment, then washing and soaking in distilled water for 12 hours, the full-grained and sinking annual castor oil No. 4 castor seeds grow into healthy seedlings of 30 cm and are buried in the soil surface at a depth of 15 cm along the vertical direction at an inclination of 30 degrees. The plant spacing is 25 cm, and the row spacing is 25 cm. In late March, two cycles of annual castor oil castor No. 4 were planted continuously in the experimental field polluted by heavy metals in the sludge land. While planting the castor plant, biochar-based fertilizer was applied to the...

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