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Polluted soil ectopic curing repair construction device system and construction method

A technology of polluted soil and construction method, which is applied in the field of polluted soil remediation, can solve the problem of not forming a soil solidified body, and achieve the effect of saving consumption and reducing engineering costs.

Inactive Publication Date: 2018-02-09
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from this that it can be seen that this process does not form a relatively regular soil solidification body, nor does it use a pressurized process, but solidifies heavy metals through chemical bonds, so it is different from the construction device system based on high-pressure pressing molding equipment in this patent. and construction methods are quite different

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  • Polluted soil ectopic curing repair construction device system and construction method

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Embodiment 1

[0044] The invention provides a construction device system and construction method for heterotopic solidification and restoration of polluted soil, referring to figure 1 As shown, it specifically includes the following steps:

[0045] Step S1, firstly determine the excavation scope of the contaminated soil, and then excavate the contaminated soil within this scope.

[0046] Step S2, using the excavation and transportation unit to dig up the contaminated soil and send it to the soil transportation equipment, and then transport it to the restoration operation area through the soil transportation equipment for soil restoration. Among them, the soil excavation and transportation unit includes soil excavation equipment and soil transportation equipment. The soil excavation equipment excavates the contaminated soil and loads it into the soil transportation equipment, and the soil transportation equipment transports the contaminated soil to the remediation operation area. In a speci...

Embodiment 2

[0056] The construction method of this embodiment is the same as that of Embodiment 1, the difference is that the curing agent in step S5 specifically includes Portland cement, bentonite, and magnesium oxide compound soil curing agent, and the weight ratio of the three is 7:1:2 . The analysis and test results of the solidified body show that the leaching concentrations of cadmium, arsenic and lead in the leaching solution are all lower than the leaching toxicity target value formulated in the restoration technical plan of the project, meeting the acceptance standard; the average compressive strength of the solidified block is 2.3MPa, and the The minimum compressive strength of a single block is 2.1MPa, which is slightly higher than the compressive strength requirement (2.0MPa) of the solidified block formulated in the restoration technical plan of the project.

Embodiment 3

[0058] The construction method of this embodiment is the same as that of Embodiment 1, except that the weight ratio of the curing agent added in step S5 to the soil is 5:10. The weight ratio of water to soil / curing agent mixture in the soil / curing agent mixture after the water injection treatment in step S6 is 1:1. During the pressing process in step S7, the pressure of the pressing forming module to form the solidified soil block is 50 MPa, and the vibration frequency is 4500 times / min. The analysis and test results of the solidified body showed that the leaching concentrations of cadmium, arsenic and lead in the leaching solution were all lower than their detection limits, far lower than the leaching toxicity target value formulated in the restoration technical plan of the project, and reached the acceptance standard; and the solidified block The average compressive strength is 10.5MPa, and the minimum compressive strength of a single block is 9.6MPa, both of which are far h...

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Abstract

The invention provides a polluted soil ectopic curing repair construction device system and a construction method. The construction method comprises the following steps: polluted soil is excavated andfed to an airing platform, paved with impermeable facilities, for airing; the polluted soil is screened, garbage in the polluted soil is separated from soil, and the soil is primarily crushed; a curing agent is added in the polluted soil after crushing for uniform mixing to form a soil / curing agent mixture; water is injected in the soil / curing agent mixture for uniform mixing; the soil / curing agent mixture is pressed after water injection and mixing to form multiple soil curing blocks; and the soil curing blocks are maintained under a constant-temperature and constant-humidity environment with rated temperature and humidity ranges. Based on high-pressure pressing equipment, precise control of such parameters as pressure and soil water content, the construction device with higher automation degree and the construction method, the polluted soil ectopic curing repair engineering can be strictly performed according to the parameters obtained by a laboratory.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a construction device system and a construction method for ectopic solidification and restoration of polluted soil with precise control of construction parameters and a high degree of automation. Background technique [0002] With the acceleration of urbanization and industrial transfer, the number of contaminated sites relocated or left behind by urban industrial enterprises in my country is increasing day by day, and site-contaminated soil has become a limiting factor for the safe reuse of land resources in many large and medium-sized cities in my country. The research and practice of site contaminated soil remediation has become an important content in the field of environmental governance in my country. [0003] Solidification and stabilization has become the main technical method for heavy metal contaminated soil remediation in my country. ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/20
Inventor 张长波倪晓芳商照聪曹卫宇陈励科李云峰邹晓岱吴向阳
Owner SHANGHAI RES INST OF CHEM IND
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