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Microbial remediation method for heavy metal contaminated soil in retired slag yard of smelting plant

A technology for microbial remediation and contaminated soil, which is applied in the field of microbial remediation of heavy metal contaminated soil in decommissioned slag fields of smelters, and can solve the problems of secondary pollution, high operating costs, and easy redissolving of heavy metal sludge.

Pending Publication Date: 2021-07-16
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many treatment methods for smelting slag, and most of them adopt the chemical treatment technology of adding reducing agent. However, this method not only has high operating costs, but also produces heavy metal sludge that is easy to dissolve again, causing secondary pollution.

Method used

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  • Microbial remediation method for heavy metal contaminated soil in retired slag yard of smelting plant
  • Microbial remediation method for heavy metal contaminated soil in retired slag yard of smelting plant
  • Microbial remediation method for heavy metal contaminated soil in retired slag yard of smelting plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Microbial in-situ mineralization repair method for lead-zinc tailings reservoir

[0040] Using the above-mentioned microbial remediation technology, a lead-zinc tailings pond was used as the main demonstration area for microbial in-situ mineralization remediation. The physical and chemical properties of the tailings samples are shown in Table 1.

[0041] Table 1 Physical and chemical parameters of tailings samples

[0042]

[0043] Before the restoration of the tailings pond, it was close to desertification, and the water and soil loss was serious. After 2 months of in-situ remediation with microorganisms, the solidification of free heavy metals in the tailings, the tailings reservoir area has become biologically friendly, and a large number of bryophytes and a small amount of herbaceous plants have begun to grow. In about 6 months, the use of microbial in-situ restoration technology has been completely greened. Drilling rigs were used to drill groundwa...

Embodiment 2

[0044] Example 2 Wet detoxification chromium slag stockyard contaminated soil microbial remediation method

[0045] Take 150g of each uniformly mixed sample into a bottle, add 100mL of water, culture medium, and mixed bacteria solution, and let it stand in an incubator at room temperature for 3-4 days to determine the effect of microbial restoration.

[0046] 1) pH and Eh changes before and after restoration

[0047] The Eh of the repair group of the three samples added with the mixed bacteria solution dropped from the initial 260-300mV to -400mV--260mV, and the decrease was obvious, and the Eh of the blank control group tended to be stable (250mV-310mV); the pH of the repair group added with the mixed bacteria solution Stable at 7.5-8.5, the stable form of chromium in this pH and Eh range is Cr(OH) 3 .

[0048] 2) Microbial restoration effect

[0049] Compared with the data of the blank control group added with water and culture medium, the chromium repair effect of the re...

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Abstract

The invention provides a microbial remediation method for heavy metal contaminated soil in a retired slag yard of a smelting plant. The method comprises the following steps of: selecting mixed bacteria of sulfate reducing bacteria and iron reducing bacteria, culturing in a liquid culture medium containing Zn<2+>, Pb<2+> and Cr<6+> under a neutral condition until the concentration of Zn<2+>, Pb<2+> and Cr<6+> in the culture medium is lower than that of a detection line, selecting strains in a bottle for transferring, and gradually increasing the concentration of Zn<2+>, Pb<2+> and Cr<6+> for gradient domestication; and adding the domesticated bacterial liquid into polluted soil, wherein the addition amount of the bacterial liquid is that the mass volume ratio (g: mL) of the soil to the bacterial liquid is 1: 1-3: 1. After culture is performed for 4-7 days at the temperature of 30-35 DEG C, the soluble Zn<2+>, Pb<2+> and Cr<6+> in the remedied soil are lower than 0-0.05 mg / L, 0-0.05 mg / L and 0-0.05 mg / L, and the groundwater quality standard III-type water standard is met.

Description

technical field [0001] The invention belongs to the technical field of microorganisms, and relates to a method for remediating contaminated soil, in particular to a microbial remediation method for soil polluted by heavy metals (zinc, lead and chromium exceed the standard) in decommissioned slag yards of smelters. Background technique [0002] At present, my country is seriously polluted by heavy metals such as zinc, lead, and cadmium. More than 40% of these heavy metal pollutions come from the non-ferrous metal mining, dressing and smelting industry. Among them, the long-term unorganized stockpiling and substandard discharge of lead-zinc smelting slag cause surrounding environmental pollution. Especially notable. The heavy metals in the smelting slag not only have the characteristics of wide diffusion, high toxicity, and difficult disposal, but also destroy the endogenous microbial community structure, migrate to the surrounding soil, and cause food safety problems derived f...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/10
Inventor 崔兴兰谷启源袁学韬刘兴宇纪仲光张其东
Owner 有研资源环境技术研究院(北京)有限公司
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