Preparation of heavy metal contaminated soil leachate and in-situ leaching engineering practical method

Abstract

The invention discloses preparation of heavy metal contaminated soil leachate and an in-situ leaching engineering practical method. The engineering practical method comprises the following steps: investigation of a contaminated site; boundary defining of the contaminated site; excavation of contaminated soil; construction of a leachate collecting system; construction of a contaminated site seepagecontrol system; spraying of the leachate; water spraying; monitoring of the leachate; and treatment of the leachate. According to the engineering practical method disclosed by the invention, the advantages of traditional in-situ leaching are combined with the advantages of ectopic leaching, the demands of ancillary works are greatly reduced, the technology is simple, leaching raw materials are wide in sources and the leachate can be recycled; the cost is low, no special equipment demand is required, and groundwater contamination during the in-situ leaching process can be avoided; the engineering practical method is low in environmental risk and has a broad application prospect in the field of soil contamination remediation.

Description

technical field [0001] The invention discloses a method for preparing soil heavy metal polluted eluent and an in-situ leaching engineering practice method, belonging to the field of soil heavy metal pollution control and restoration, food safety and environmental protection engineering. Background technique [0002] According to survey data, there are 2 million mu of industrial sites to be repaired in my country, about 3 million mu of mine polluted land to be repaired, and about 392 million mu of polluted cultivated land to be repaired. [0003] At present, leaching, as one of the effective methods for remediation of contaminated soil, has received more and more attention in engineering practice. However, in-situ leaching requires engineering measures such as leaching towers, leaching wells, and extraction wells. The construction cost is high, the eluent does not have sufficient contact with the soil, and the leaching effect is poor. At the same time, the eluent still has in...

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Problems solved by technology

[0005] The preparation of soil heavy metal polluted eluate and the in-situ leaching engineering practice method disclosed by the present invention adopt the natural infiltration method, which solves the need for a large number of ancillary engineering measures for in-situ leaching, high cost, insufficient leaching, and groundwater Pollution and other shortcomings, it also solves the shortcomings of ectopic leaching that requires a lot of professional equipment, high time cost, waste of resources, etc., and has broad application prospects in the field of contaminated soil remediation

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