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Method for remediation of lead-cadmium polluted soil

A technology for cadmium-contaminated soil and compound pollution, applied in the restoration of polluted soil and other directions, can solve the problems of heavy metal re-dissolution, unfavorable soil water retention and ventilation, chemical fixation easily changes soil structure, etc., so as to reduce heavy metal content and prevent heavy metal re-dissolution. Effect

Active Publication Date: 2019-12-20
铜仁市万山区植保植检站
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, during the decomposition process of pig manure, reduced iron and manganese can be formed, and low-priced iron and manganese complexes can be formed with organic matter, thereby reducing the content of Cd and Zn in the oxide state of iron and manganese. However, chemical fixation is easy to change the soil structure, which is not conducive to The soil is water-retaining and breathable, and it is easy to cause heavy metals to dissolve

Method used

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  • Method for remediation of lead-cadmium polluted soil

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Embodiment 1

[0029] A method for remediating lead-cadmium-contaminated soil. Aiming at lead-cadmium compound-contaminated soil, a combined remediation method of adsorption solidification and microbial remediation is adopted, specifically comprising the following steps:

[0030] 1) Before planting crops, sprinkle 13kg / mu of adsorbent into the soil, 10kg / mu of passivator into the soil, spray water at 35kg / mu, and then plow 5-8cm deep. Place for 15 days;

[0031] 2) Sprinkle the compound bacterial preparation into the soil according to the amount of 8kg / mu, shallowly plow 3-5cm, then spray the film-forming liquid to the soil according to the amount of 7kg / mu, and leave it for 15 days;

[0032] The adsorbent is composed of the following raw materials in parts by weight: 32 parts of coconut shell powder, 19 parts of peanut shell powder, 25 parts of wheat shell powder, and 13 parts of diatom powder;

[0033] The preparation method of the adsorbent is as follows: after mixing coconut shell powde...

Embodiment 2

[0041] A method for remediating lead-cadmium-contaminated soil. Aiming at lead-cadmium compound-contaminated soil, a combined remediation method of adsorption solidification and microbial remediation is adopted, specifically comprising the following steps:

[0042] 1) Before the crops are sown, sprinkle the adsorbent into the soil according to the amount of 7kg / mu, sprinkle the passivator into the soil with the amount of 6kg / mu, and spray water according to the amount of 30kg / mu, and then plow 5-8cm deep. Place for 10 days;

[0043] 2) Sprinkle the compound bacterial preparation into the soil according to the amount of 5kg / mu, shallowly plow 3-5cm, then spray the film-forming liquid to the soil according to the amount of 3kg / mu, and leave it for 10 days;

[0044] The adsorbent is composed of the following raw materials in parts by weight: 20 parts of coconut shell powder, 14 parts of peanut shell powder, 17 parts of wheat shell powder, and 7 parts of diatom powder;

[0045] T...

Embodiment 3

[0053] A method for remediating lead-cadmium-contaminated soil. Aiming at lead-cadmium compound-contaminated soil, a combined remediation method of adsorption solidification and microbial remediation is adopted, specifically comprising the following steps:

[0054] 1) Before the crops are sown, sprinkle the adsorbent into the soil according to the amount of 10kg / mu, sprinkle the passivator into the soil with the amount of 8kg / mu, and spray water according to the amount of 32kg / mu, and then plow 5-8cm deep. Place for 12 days;

[0055] 2) Sprinkle the compound bacterial preparation into the soil according to the amount of 7kg / mu, shallowly plow 3-5cm, then spray the film-forming liquid to the soil according to the amount of 5kg / mu, and leave it for 13 days;

[0056] The adsorbent is composed of the following raw materials in parts by weight: 25 parts of coconut shell powder, 17 parts of peanut shell powder, 21 parts of wheat shell powder, and 10 parts of diatom powder;

[0057]...

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a method for remediation of lead-cadmium polluted soil. A combined remediation method of adsorption solidification and microbial remediation is adopted to remediate lead-cadmium polluted soil. The method particularly comprises the following steps: spreading an adsorbent and a passivator into the soil before crop seeds are sown, spraying water at the same time, then carrying out deep tillage by 5-8 cm, and standing the soil for 10-15 days; and spreading a compound bacterial preparation into the soil, carrying out shallow tillage by 3-5cm, then spraying a film forming solution into the soil, and standing the soil for 10-15 days. Through adoption of the combined remediation method of adsorption solidification and microbial remediation, heavy metals are firstly adsorbed and solidified under action of the adsorbent and the passivator, and then the adsorbed and solidified heavy metals are digested and converted by microorganisms, so that the content of the heavy metals in the soil is reduced, and the heavy metals are prevented from being dissolved again.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating lead-cadmium polluted soil. Background technique [0002] Tailings abandoned land, also known as tailings pool, is the most common and most difficult abandoned bare land in metal mines. It not only has serious heavy metal pollution itself, but also a long-lasting source of heavy metal pollution. Toxic and harmful substances in the tailings are easy to spread with rain and dust, polluting the surrounding soil, water and atmosphere, causing serious ecological and environmental problems, and even threatening the health of local people. Among them, the pollution of Pb and Zn in the soil of the lead-zinc mining area is serious, and the Cd exceeds the secondary limit value (0.60mg / kg) in the "Soil Environmental Quality Standard", causing serious pollution, and Cd is highly toxic, non-biodegradable and potentially carcinogenic. It poses a s...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/10
Inventor 顾昌萍杨宝平
Owner 铜仁市万山区植保植检站
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