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Heavy metal contaminated soil remediation method

A technology of polluted soil and remediation method, applied in the field of heavy metal contaminated soil remediation, can solve the problems of slow effect, inability to remove heavy metals, long duration of microbial remediation, etc., and achieve the effects of reducing accumulation, efficient remediation, and convenient soil transportation

Inactive Publication Date: 2020-01-07
安徽科灵环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing microbial remediation technology for heavy metal-contaminated soil has certain limitations, such as microbial remediation lasts for a long time, takes effect slowly, generally forms complexes to reduce the harm of heavy metals, and cannot remove heavy metals from the soil

Method used

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  • Heavy metal contaminated soil remediation method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0028] 1. Excavation of the foundation pit, heighten the side walls of the foundation pit, pave the waterproof layer on the bottom and side walls of the foundation pit, and backfill the soil contaminated by heavy metals;

[0029] 2. Add 60ml of magnetotactic bacteria liquid medium to heavy metal contaminated soil, and inoculate 9.0×109 magnetotactic bacteria per square meter of heavy metal contaminated soil to plow the soil with a thickness of 15cm on the surface of the heavy metal contaminated soil to make The magnetotactic bacteria are fully mixed with soil contaminated by heavy metals;

[0030] 3. Cultivate for 30 days, add magnetotactic bacteria liquid culture medium at 5cm of the surface layer of heavy metal contaminated soil, irrigate the heavy metal contaminated soil with water in step 2, keep the heavy metal contaminated soil submerged, and set a magnetic field on the side of the heavy metal contaminated soil , Keep for 20 days, drain water;

[0031] 4. The method of rinsing...

specific Embodiment 2

[0035] 1. Excavation of the foundation pit, heighten the side walls of the foundation pit, pave the waterproof layer on the bottom and side walls of the foundation pit, and backfill the soil contaminated by heavy metals;

[0036] 2. Add 60ml of magnetotactic bacteria liquid medium to heavy metal contaminated soil, and inoculate 1.0×1010 magnetotactic bacteria per square meter of heavy metal contaminated soil to plow the soil with a thickness of 15 cm on the surface of the heavy metal contaminated soil to make The magnetotactic bacteria are fully mixed with soil contaminated by heavy metals;

[0037] 3. Cultivate for 32 days, add magnetotactic bacteria liquid culture medium at 6cm of the surface layer of heavy metal contaminated soil, irrigate the heavy metal contaminated soil with water in step 2, keep the heavy metal contaminated soil in a submerged state, and set a magnetic field on the side of the heavy metal contaminated soil , Keep for 22 days, drain water;

[0038] 4. The meth...

specific Embodiment 3

[0042] 1. Excavation of the foundation pit, heighten the side walls of the foundation pit, pave the waterproof layer on the bottom and side walls of the foundation pit, and backfill the soil contaminated by heavy metals;

[0043] 2. Add 80ml of magnetotactic bacteria liquid medium to heavy metal contaminated soil, and inoculate 1.0×1010 magnetotactic bacteria per square meter of heavy metal contaminated soil to plow the soil with a thickness of 20cm on the surface of the heavy metal contaminated soil to make The magnetotactic bacteria are fully mixed with soil contaminated by heavy metals;

[0044] 3. Cultivate for 35 days, add magnetotactic bacteria liquid culture medium at 8cm of the surface layer of heavy metal contaminated soil, irrigate the heavy metal contaminated soil with water in step 2, keep the heavy metal contaminated soil in a submerged state, and set a magnetic field on the side of the heavy metal contaminated soil , Keep for 25 days, drain the water;

[0045] 4. The m...

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Abstract

The invention discloses a heavy metal contaminated soil remediation method, and relates to the technical field of soil remediation, wherein the method comprises the steps of foundation pit excavation,side wall heightening, waterproof layer laying, heavy metal contaminated soil backfilling, magnetotactic bacteria liquid culture medium adding, water irrigation, leacheate adding, nutrient solution adding and pteris vittata and bamboo willow planting. The invention discloses the heavy metal contaminated soil remediation method. Waterproof layers are laid at the bottom and on the side wall of a foundation pit; the outside leakage of leacheate through soil after injection is reduced; pollution to groundwater is reduced, soil transportation is convenient, adsorption of magnetotactic bacteria toheavy metal ions is mainly based on adsorption of cell surfaces. The magnetotactic bacteria are high in adsorption speed on heavy metals, the heavy metals in the soil are effectively adsorbed in the moving process, the accumulation amount of the heavy metals in the soil is greatly reduced, the heavy metal contaminated soil is remediated in a mode of combining the magnetotactic bacteria, leacheateand phytoremediation, remediation is more efficient, and a better use prospect is brought.

Description

Technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal contaminated soil. Background technique [0002] Soil is the cradle of all things and the cornerstone of human civilization. The soil is an open ecosystem, and it exchanges with the outside world continuously, rapidly, and a large amount of material and energy. The soil itself has the ability of self-healing, and reaches a stable state through adsorption and degradation. Once it exceeds the scope of self-repair, the substances in it will become soil pollutants. In recent years, the continuous occurrence of "blood lead", "cadmium rice" and "arsenic poisoning" incidents have caused the issue of heavy metal pollution in soil to receive widespread attention from all walks of life. Generally speaking, the problem of soil pollution in my country is getting worse. According to statistics, about one-fifth of my country's arable land is polluted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 任冲
Owner 安徽科灵环境科技有限公司
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