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In-situ remediation method of heavy metal polluted site

An in-situ repair and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problems of soft foundation, secondary pollution, etc., and achieve the effect of low equipment investment and operation costs, simple process, and unlimited treatment site location

Inactive Publication Date: 2012-08-22
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ repair method for heavy metal-contaminated sites, aiming at the deficiencies of existing methods for remediating heavy metal-contaminated sites. The stabilizer can completely cover the contaminated site with the stabilizer to avoid secondary pollution of the environment caused by heavy metal pollutants; the use of amphibious excavators to repeatedly mix the contaminated site can make the stabilizer fully react with the heavy metal pollutants to form Stable substances to ensure that the leaching concentration of heavy metals is within the allowable range; after drying and consolidating for several days, the treated site can be used for land improvement, landscaping or landfill according to the difference in moisture content and heavy metal ingress and egress concentration landfill
Therefore, this method focuses on solving the problem of soft foundation encountered in general mixing methods. If the foundation allows, ordinary excavators can be used for site mixing to ensure sufficient mixing of chemicals and contaminated soil.

Method used

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  • In-situ remediation method of heavy metal polluted site

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: Amphibious excavators were used to treat sites polluted by heavy metals such as mercury, copper, and cadmium in the Hangu sewage reservoir (heavy metal contents in the polluted sites are shown in Table 1). ① First, carry out the construction of the cofferdam to ensure that the transportation vehicles pass through during the construction period. ② Discharge the sewage in the cofferdam area. ③Wait for the pre-consolidation of the bottom mud, and dry the bottom mud in the air for 12 hours. If time is urgent, you can spray lime powder on the contaminated site to evenly accelerate the consolidation of the site. The thickness of the lime powder coverage is controlled at 2-5cm. ④ Begin to evenly apply heavy metal chelating and stabilizing agents on the surface of the polluted site. The amount of agents added is 10% (based on dry basis sludge, weight ratio), and the excavator is used for stirring, and the stirring is carried out in 3 times. Control the increment of ...

Embodiment 2

[0016] Embodiment 2: The implementation method is the same as in Embodiment 1, and the content of heavy metals in the polluted site is changed, as shown in Table 3. The application amount of the heavy metal chelating stabilizer was changed to 15% (based on dry sludge, weight ratio). After 2 to 3 months, measure the leaching concentration of heavy metals such as mercury, cadmium and copper to the polluted soil according to the requirements of "Pollution Control Standards for Domestic Garbage Landfill Sites" (GB 16889-2008), as shown in Table 4, all lower than The leaching concentration limit of heavy metals stipulated in this standard. Refer to "Sludge Disposal of Urban Sewage Treatment Plants for Land Improvement of Mud Quality" (CJ / T291), that is, the treated sites polluted by heavy metals such as mercury, copper, and cadmium can be used for land use.

[0017] Table 3 Heavy metal content in polluted sites Unit: mg / kg

[0018] project

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Abstract

The invention discloses an in-situ remediation method of a heavy metal polluted site, which is characterized in that a stabilizing agent is completely covered on the polluted site through throwing a heavy metal-chelating stabilizing agent on the polluted site with low water content, thus secondary pollution of heavy metal pollutants to the environment is avoided; the polluted site is turned and stirred for multiple times by using an amphibious excavator, the stabilizing agent and the heavy metal pollutants can fully react to form a stable material, thus ensuring that the leaching concentration of heavy metals is in an allowable range; and concretion is carrying out for multiple days through airing, the treated site can be used for soil improvement, landscaping or landfill backfilling according to difference of the water contents and the heavy metal in and outlet concentrations. Therefore, compared with the prior art, the in-situ remediation method has the advantages of ensuring stabilizing effect of the heavy metals, importantly solving the problem of soft foundation encountered by common stirring modes, and ensuring that chemicals are fully mixed with the polluted soil through adopting common excavators for site stirring if the foundation is allowable.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal-contaminated sites, and in particular relates to a method for in-situ remediation of heavy metal-contaminated sites. Background technique [0002] In recent years, heavy metal pollution incidents have emerged one after another in my country. According to incomplete statistics, in 2009, the Ministry of Environmental Protection received 12 heavy metal and metalloid pollution incidents, resulting in 4035 people with excessive blood lead and 182 people with excessive cadmium, causing 32 mass incidents. In 2010, there were 14 heavy metal pollution incidents across the country, 9 of which were blood lead incidents; from January to August 2011, 11 heavy metal pollution incidents occurred nationwide, 9 of which were blood lead incidents. On January 15, 2012, it was found that the heavy metal cadmium in the water quality exceeded the standard at Lalang Wharf in Yizhou, Longjiang River in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 张景辉刘朝辉王文茜西伟力李野杨伟韩嵩卢丹王尧
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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