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High-pressure jet grouting and shallow-layer stirring combination in-situ remediation method for soil and underground water

A high-pressure rotary spraying and in-situ repairing technology, which is applied in the restoration of polluted soil, etc., can solve the problems of tight repair schedule and large differences in the distribution concentration of organic pollutants, so as to eliminate secondary pollution problems, low cost and easy installation. quick effect

Active Publication Date: 2017-06-06
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the situation that the distribution concentration of organic pollutants in the soil and groundwater of heavily polluted plots is greatly different in the current domestic soil and groundwater in-situ restoration projects, especially for sporadic pollution of deep and shallow local soil point sources , Severe soil-water complex organic pollution, projects with urgent repair schedules, solve the problem of supplementary repair of local sporadic pollution sources in shallow (mainly miscellaneous fill) or deep contaminated soil, and save construction period

Method used

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  • High-pressure jet grouting and shallow-layer stirring combination in-situ remediation method for soil and underground water
  • High-pressure jet grouting and shallow-layer stirring combination in-situ remediation method for soil and underground water
  • High-pressure jet grouting and shallow-layer stirring combination in-situ remediation method for soil and underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0102] This example is an in-situ chemical oxidation technology for key polluted land plots / areas in organically polluted soil / groundwater remediation projects. The combined remediation process of deep-layer high-pressure rotary jet injection-shallow layer in-situ stirring is used to realize remediation agents (oxidants K, C) The method of adding, the operation not specifically described in this embodiment, refer to the method already given in the summary of the invention, and will not be repeated here.

[0103] This embodiment is specifically as follows:

[0104] Take the soil and groundwater remediation project of a chemical plant in Nanjing as an example. The soil remediation project volume of the project is 258,000 square meters, and the groundwater remediation project volume is 170,000 square meters. The target pollutants in the soil and groundwater are chlorobenzene, p- / o-nitrochlorobenzene (hereinafter referred to as "p / o nitrate") and other VOCs / SVOCs organic substance...

Embodiment 2

[0106] This example repairs the target pollutants chlorobenzene and p / o-nitrochlorinated benzene (abbreviated as p / o-nitrogen) in Example 1 with high-pressure rotary jet injection and shallow stirring combined in-situ repair method The effect is evaluated.

[0107] The repair of the main body adopts a technological plan of injecting a round of K agent. The first round of acceptance found that there are sporadic pollution sources in the local area exceeding the standard. Therefore, the supplementary repair adopts the method of the present invention, that is, the deep layer is 4 to 12m deep using high-pressure rotary jet injection technology, 0 ~4m depth adopts shallow in-situ mixing process. Such as Figure 4 , Figure 5 As shown, there are pollution sources at the local 3m and 9m positions (para / o-nitrate > 1000ppm). After multiple rounds of injection and stirring, the main target pollutants in the soil, chlorobenzene and para / o-nitrate, all reached the standard, and the res...

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Abstract

The invention provides a high-pressure jet grouting and shallow-layer stirring combination in-situ remediation method for soil and underground water and belongs to the technical field of soil and underground water in-situ remediation methods. The combination in-situ remediation method comprises the following steps: distributing high-pressure jet grouting in-situ injection points, and carrying out measurement, locating and pre-boring; carrying out the high-pressure jet grouting injection of a deep layer in one to three times; carrying out the in-situ stirring of a shallow layer in one to two times; carrying out agent reaction and underground water monitoring; and carrying out self-inspection and acceptance. Agents which are injected for high-pressure jet grouting injection in three times are sequentially C+N1+N2, K and K+B. Agents which are added for the in-situ stirring of the shallow layer are C+F+N1+N2. The highest adding ratio of part of the high-pressure jet grouting injection of the deep-layer zone is as follows: the agent C accounts for 1.6-2.4%, and the agent K accounts for 1-5.4%. Being used as the remediation solution of an organic pollution engineering with sporadic pollution spots in part of severe soil and underground water plots, the remediation method has the advantages of being short in construction period, being great in effect and being capable of adapting to various strata and is used as an important technical means for replenishing remediation.

Description

technical field [0001] The invention relates to an in-situ restoration method for soil and groundwater combined with high-pressure rotary spraying and shallow layer stirring, and belongs to the technical field of in-situ restoration methods for soil and groundwater. Background technique [0002] Volatile and semi-volatile (VOVs / SVOVs) organic pollution of soil and groundwater is one of the important pollution types of polluted sites in my country. Since VOVs / SVOVs have certain volatility, in order to avoid secondary pollution caused by excavation and transportation, the original Bit restoration technology has gradually been popularized and applied. [0003] Due to the particularity of the physical and chemical properties of VOCs / SVOCs, they are often in the solid phase (adsorbed state), liquid phase (dissolved state), gas phase (saturated layer can be ignored), free phase (non-aqueous liquid) and so on in soil and groundwater. Four states exist and move. Due to the long his...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 杨乐巍李书鹏张岳汪福旺张晓斌谢倩宋晓威陈凡尹鹏程田齐东
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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