Chemical and microorganism combined remediation method and application of compound heavy metal polluted soil

A technology of polluted soil and joint restoration, applied in the restoration of polluted soil and other directions, can solve the problems of high cost, secondary pollution, slow growth rate, etc. Effect

Inactive Publication Date: 2014-09-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disadvantages: hyperaccumulator plants tend to be short in size, low in biomass, slow in growth rate, and long in growth cycle; most hyperaccumulator plants can only accumulate certain Heavy metals, not suitable for complex heavy metal contaminated soil remediation; phytoremediation is limited by environmental conditions such as soil type, temperature, humidity and nutrition
Generally speaking, the above methods are costly and not suitable for soils with large polluted areas, and are easy to damage the soil structure and soil fertility, and even cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare polluted soil chemical amendments by the following components by weight: plant ash: 3 parts by weight; calcium magnesium phosphate fertilizer: 12 parts by weight; quicklime: 4 parts by weight; Fertilizer: 4 parts by weight. Among them, the effective mass fraction of phosphorus pentoxide in the calcium magnesium phosphate fertilizer is ≥ 12%, the mass fraction of water is ≤ 0.5%, and the fineness is ≥ 80% through a 0.25mm test sieve. The mass fraction of calcium oxide in quicklime is ≥80%. The organic matter mass fraction of organic fertilizer (based on drying basis) ≥ 40%; the mass fraction of total nutrients (nitrogen + phosphorus pentoxide + potassium oxide) (calculated on drying basis) ≥ 4.0%; moisture (fresh sample) Mass fraction ≤ 30%; acidity and alkalinity pH value is 5.5-8.5.

[0041] Select in the soil containing Cd, Zn, Cu heavy metal pollution within 1 kilometer near a certain electroplating factory (this area is a heavily polluted area), use the po...

Embodiment 2

[0048] Prepare polluted soil chemical modifier by the following components by weight: plant ash: 11 parts by weight; calcium magnesium phosphate fertilizer: 1 parts by weight; quicklime: 21 parts by weight; zeolite: 6 parts by weight, 0.6 parts by weight of hydroxyapatite and organic fertilizer : 12 parts by weight.

[0049] Choose to use the polluted soil chemical amendment of this embodiment in the soil containing Ag and Cd heavy metal pollution within 2 kilometers near a certain chemical plant (this area is a moderately polluted area), the addition is 40kg / mu, and the balance soil improvement time 10 days.

[0050] Then, when the soil humidity of the polluted site is between 40% and 80%, evenly spray the microbial functional bacterial liquid prepared by the microbial bacterial agent. The microbial bacterial agent is prepared by using comprehensive bioengineering technology, including highly effective heavy metal inhibitory microbial functional bacterial agent (liquid state...

Embodiment 3

[0056] The contaminated soil chemical improver in this example is prepared with reference to Example 1 of patent CN102303041A: Bentonite, ferrous sulfide, magnesium sulfate, magnesium sulfite, magnesium oxide, calcium hydroxide and calcium dihydrogen phosphate are mixed according to the ratio of 0:15:0.5 :8:1:10:1, mix well, and become heavy metal contaminated soil remediation agent.

[0057] Choose to use the composite heavy metal-contaminated soil improver of the present embodiment in the soil containing Cr, Pb, Hg heavy metal pollution within 1 kilometer near a certain chemical plant (this area is a slightly polluted area), and the application method is: use a forklift Feed the material polluted by heavy metals containing Cr, Pb, and Hg into the hopper of the crusher, and after being crushed, transport it to the mixer through a belt, mix it with the restoration agent, mix it evenly according to the weight ratio of soil: agent = 15:1, and then send it to the crusher through t...

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PUM

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Abstract

The invention discloses a chemical and microorganism combined remediation method and application of compound heavy metal polluted soil. Heavy metal ions in polluted soil are immobilized by adding a polluted soil chemical improver, and then the remediation of the polluted soil is continuously enhanced through an efficient heavy metal inhibiting microorganism functional fungicide and a soil improver microorganism function fungicide, thus the defect that a conventional chemical improver can well immobilize the single heavy metal and the heavy metals with similar natures but can not reach the standard when being used for remedying the compound heavy metal polluted soil is overcome; meanwhile, the chemical and microorganism combined remediation method integrates economic and environmental benefits, and can be applied to the remediation of the compound heavy metal polluted soil on large scale.

Description

technical field [0001] The invention relates to the technical field of heavy metal-contaminated soil treatment, and particularly discloses a combined chemical and microbial restoration method and application of complex heavy metal-contaminated soil. Background technique [0002] With the increase of my country's population, the promotion of urbanization and the improvement of people's material living standards, the demand for various products processed and produced by industrial and mining enterprises has also increased rapidly. Harmful heavy metals (such as Cr, Cd, Pb, As, etc.) discharged into the environmental soil continue to increase, seriously destroying the natural ecological environment and threatening people's health, so the treatment of polluted soil is imminent. [0003] The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
Inventor 陈文清侯翔刘文超赵栗笠张小凤苏子艺
Owner SICHUAN UNIV
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