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In-situ ectopic restoration method for river polluted soil

A technology for ex-situ restoration of polluted soil, applied in the field of in-situ ex-situ restoration of polluted soil in rivers, can solve the problems of shallow pollution depth, low cost, low pollution degree, etc., and achieves good restoration efficiency, convenient operation and short time. Effect

Inactive Publication Date: 2019-07-12
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an in situ repair method for river polluted soil, so as to solve the problem that the river channel is long and narrow, the pollution degree is low, and the pollution depth is shallow. In-situ treatment; and because the tidal flat soil is relatively dense and the progress of in-situ mixing treatment is slow, the in-situ ex-situ repair method of the present invention is not only convenient to operate, short in time, low in cost, good in repair efficiency, and can meet repair standards

Method used

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  • In-situ ectopic restoration method for river polluted soil
  • In-situ ectopic restoration method for river polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Taking the treatment of heavy metal pollution in a river in Gansu Province as the object of restoration, the schematic diagram of a section of the river is as follows figure 2 As shown, it is divided into 3 districts, each with an area of ​​about 500m 2 . Adopt the in situ repairing method of river channel polluted soil of the present invention, and adopt the remediation agent that is made up of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide, the addition amount of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide is pollution respectively 1%, 3.5%, 0.55% and 0.5% of the soil mass. After the restoration is completed, 5 pieces of soil with a depth of 0-1000mm are collected in each area and mixed into one sample, and the toxicity leaching test is carried out according to the "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) to determine the concentration of concern in the leachate....

Embodiment 2

[0039] Taking the treatment of heavy metal pollution in a river section in Hunan Province as the object of restoration, the schematic diagram of a section of the river course is as follows image 3 As shown, it is divided into 2 districts, each with an area of ​​about 1000m 2 . Adopt the in situ repairing method of river channel polluted soil of the present invention, and adopt the remediation agent that is made up of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide, the addition amount of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide is pollution respectively 1.5%, 4.2%, 0.65% and 0.5% of the soil mass. After the repair is completed, 9 soils with a depth of 0-500mm are collected from each area and mixed into one sample, and the toxicity leaching experiment is carried out according to the "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillating Method" (HJ557-2010), and the pollutants of concern in the leachate are de...

Embodiment 3

[0044] Taking the treatment of heavy metal pollution in a tributary of a river basin in Guangxi Province as the object of restoration, the schematic diagram of a section of the river is as follows Figure 4 As shown, it is divided into 2 districts, each with an area of ​​about 625m 2 . Adopt the in situ repairing method of river channel polluted soil of the present invention, and adopt the remediation agent that is made up of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide, the addition amount of calcium oxide, magnesium chloride, aluminum chloride and sodium sulfide is pollution respectively 1%, 1.3%, 0.55% and 0.5% of the soil mass. After the repair is completed, 6 soils with a depth of 0-800mm are collected in each area and mixed into one sample, and the toxicity leaching experiment is carried out according to the "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) to determine the concentration of concern in...

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Abstract

The invention discloses an in-situ ectopic restoration method of river polluted soil, which comprises the following steps of: 1) excavating the river polluted soil; 2) sampling and detecting soil at the bottom and a side wall of a foundation pit; 3) crushing and screening the excavated soil; 4) layering and paving and raking the screened soil in the foundation pit by using a forklift; 5) uniformlypaving and spreading a restoration medicament on a surface of the soil, and rotary tilling and stirring; 6) sampling and detecting whether the polluted soil reaches a restoration target or not, and performing circulating operations of layering and paving, raking, adding the restoration medicament, and rotary tilling until the restoration target is reached; and 7) finally performing mechanical rolling, inspecting compactness and finishing the surface. Aiming at the characteristics of shallow river soil pollution depth and the like, the in-situ ectopic restoration method of the river polluted soil performs in-situ ectopic restoration and has the advantages of convenient operation, short time, low cost, good restoration efficiency and capability of meeting the repair standard.

Description

technical field [0001] The invention relates to the technical field of remediation of river polluted soil, in particular to an in-situ remediation method for river polluted soil. Background technique [0002] Rivers are the basis for human survival and development, and the development of human beings and their social and ecological systems are interdependent and inseparable from rivers. However, due to human life and production activities, pollutants are directly or indirectly discharged into the river environment, resulting in pollution of river water, tidal flats and sediment. Due to the characteristics of long and narrow river channels, low pollution degree, and shallow pollution depth, the temporary storage space is limited, which is not conducive to ex-situ treatment after all the polluted soil is excavated; and because the tidal flat soil is relatively dense, the progress of in-situ mixing treatment is slow. Contents of the invention [0003] The purpose of the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08Y02A20/402
Inventor 宋海农杨崎峰周永信林宏飞廖长君张程刘爱芳张涛梁凯铭黄聪唐奥佳何春宏廖谨宣
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH