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A combined in-situ restoration method of soil and groundwater with high-pressure rotary spraying and shallow mixing

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: 2022-04-08
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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  • A combined in-situ restoration method of soil and groundwater with high-pressure rotary spraying and shallow mixing
  • A combined in-situ restoration method of soil and groundwater with high-pressure rotary spraying and shallow mixing
  • A combined in-situ restoration method of soil and groundwater with high-pressure rotary spraying and shallow mixing

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 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. The invention comprises the following steps: high-pressure rotary spray in-situ injection point layout, measurement positioning and hole introduction; deep high-pressure rotary spray injection is divided into 1 to 3 rounds of injection; shallow in-situ stirring is divided into 1 to 2 rounds of construction ; Agent reaction and groundwater monitoring; Self-inspection and acceptance. The three rounds of high-pressure rotary jet injection are followed by: C+N1+N2→K→K+B; the shallow in-situ stirring and dosing is C+F+N1+N2. The highest local dosing ratio of the high-pressure rotary jet injection in the deep layer reaches: C agent is 1.6%-2.4%; K agent is 1%-5.4%. As a solution for organic pollution engineering restoration of sporadic pollution point sources in heavy soil and groundwater plots, the present invention has the advantages of short construction period, remarkable effect, and adaptability to various strata, and serves as an important technical means for supplementary restoration.

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. There are four states of existence and movement....

Claims

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Application Information

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Patent Type & Authority Patents(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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