Microbe and solidifying agent combined in-situ remediation method of heavy metal contaminated soil

A technology of in-situ restoration of polluted soil, applied in the field of polluted soil treatment, can solve the problems of unstable long-term curing effect of curing agent, secondary pollution, narrow application area, etc., and achieve no damage to soil fertility, no secondary pollution, The effect of less investment

CN105149342AActive Publication Date: 2015-12-16江苏环保产业技术研究院股份公司

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: 江苏环保产业技术研究院股份公司
Publication Date: 2015-12-16

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Abstract

The invention provides a microbe and solidifying agent combined in-situ remediation method of heavy metal contaminated soil. The microbe and solidifying agent combined in-situ remediation method comprises the following steps: mixing magnetotactic bacteria and heavy metal contaminated soil; irrigating heavy metal contaminated soil mixed with magnetotactic bacteria; arranging a magnetic field on heavy metal contaminated soil; collecting heavy metal contaminated soil containing magnetotactic bacteria; leaching the collected heavy metal contaminated soil and back-filling; adding a solidifying agent into heavy metal contaminated soil subjected to magnetotactic bacteria adsorption treatment, and curing for 30-45 days; and circularly repeating the steps till the content of heavy metals in soil reaches the safe standard, wherein the solidifying agent consists of SiO2, Fe2O3, Al2O3 and C3N3S3Na3. The microbe and solidifying agent combined in-situ remediation method belongs to in-situ remediation, is simple to operate, low in cost and good in remediation effect, avoids secondary contamination of soil, and is suitable for remediation of large-area contaminated soil.

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Description

technical field

[0001] The invention belongs to the field of contaminated soil treatment, and in particular relates to a combined in-situ restoration method of microorganisms and a curing agent for heavy metal-contaminated soil. Background technique

[0002] Soil pollution is caused by excessive harmful substances contained in the soil, exceeding the self-purification capacity of the soil, which causes changes in the composition, structure and function of the soil. Harmful substances gradually accumulate in the soil, through "soil→plant→human body", Or it can be indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health. Soil heavy metal pollution mainly includes mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) with significant biological toxicity, as well as zinc (Zn), copper ( Cu), nickel (Ni) and other elements, heavy metal pollution elements have poor mobility in the soil, long...

Claims

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