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A method for continuously repairing soil in situ by screw press

An in-situ repairing soil technology, applied in the field of soil remediation, can solve the problems of difficulty in meeting the requirements of rapid urban soil remediation, short environmental impact remediation period, limited application range, etc., to achieve good application prospects, rapid and continuous remediation, and solve soil The effect of heavy metal pollution on the problem

Active Publication Date: 2020-05-19
JIANGSU JINGRAN LANDSCAPE CONSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the in-situ repair method has good economic benefits, it has a long repair cycle for many compound-contaminated soils, and it is difficult to meet the requirements of rapid repair of urban soil in my country, which limits its application range; the ex-situ repair method can be operated continuously and finely, and the environment Small impact, short repair cycle, easy to achieve more thorough repair, but higher requirements for repair equipment

Method used

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  • A method for continuously repairing soil in situ by screw press

Examples

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Effect test

Embodiment 1

[0018] A method for continuously repairing soil in situ by screw press filtration, comprising the following steps:

[0019] The soil is put into the co-rotating screw machine, mixed and refined at a speed of 120rpm to obtain a refined soil. Composed of meshing threaded elements with an angle of 60° and four sets of reverse 56 / 56 conveying threaded elements, in the shearing and thinning section, the thinned soil is evenly dispersed along the direction of screw rotation, forming a sheet-shaped orientation, and gradually conveyed forward ; In the pickling section, a hydrochloric acid solution with a concentration of 1mol / L is added to the refined soil, wherein the volume ratio of the refined soil to the acidic solution is 1:4, and the pickling section is composed of four sets of inclined angles: 45° engaging threaded elements, four sets of engaging threaded elements with an inclination angle of 60°, and four sets of reversed 45° engaging threaded elements to obtain a mixed system...

Embodiment 2

[0021] A method for continuously repairing soil in situ by screw press filtration, comprising the following steps:

[0022] The soil is put into the co-meshing screw machine, mixed and refined at a speed of 120rpm to obtain a refined soil, and the shearing and refining section is composed of two sets of 56 / 56 conveying screw elements, two sets of toothed discs, four sets of Composed of meshing thread elements with an inclination angle of 60° and four sets of reverse 56 / 56 conveying thread elements, in the shearing and thinning section, the thinned soil is evenly dispersed along the direction of screw rotation to form a sheet-shaped orientation and gradually move forward Transportation; in the pickling section, add a hydrochloric acid solution with a concentration of 2mol / L to the refined soil, wherein the volume ratio of the refined soil to the acidic solution is 1:5, and the pickling section is composed of four groups of bevels Composed of 45° engaging threaded elements, four...

Embodiment 3

[0024] A method for continuously repairing soil in situ by screw press filtration, comprising the following steps:

[0025]The soil is put into the co-meshing screw machine, mixed and refined at a speed of 120rpm to obtain a refined soil, and the shearing and refining section is composed of two sets of 56 / 56 conveying screw elements, two sets of toothed discs, four sets of Composed of meshing thread elements with an inclination angle of 60° and four sets of reverse 56 / 56 conveying thread elements, in the shearing and thinning section, the thinned soil is evenly dispersed along the direction of screw rotation to form a sheet-shaped orientation and gradually move forward Transportation; in the pickling section, add a hydrochloric acid solution with a concentration of 0.5mol / L to the refined soil, wherein the volume ratio of the refined soil to the acidic solution is 1:6, and the pickling section is composed of four groups of inclined The filter press section of the meshing threa...

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Abstract

The invention relates to the technical field of soil repairing, in particular to a method for in-situ continuous repairing of soil through screw filter pressing. Soil is thrown into a same-direction meshing screw machine in situ, and the same-direction meshing screw machine is sequentially provided with a shearing refining section, an acid pickling section, a filter pressing section and a neutralization section from feeding to discharging. The same-direction meshing screw machine rotates at the rotation speed of 100-150 rpm, and the soil is refined and scattered in the shearing refining section; the soil continuously enters the acid pickling section, and an acid solution is added in the acid pickling section for dissolving heavy metal ions; the soil continuously enters the filter pressingsection, and acid liquid in which the heavy metal ions are dissolved is extruded out through screw extrusion; and the soil continuously enters the neutralization section, alkali substances are added for neutralization, and the repaired soil is obtained. Accordingly, in-situ rapid and continuous repairing of soil is achieved, and the problem of soil heavy metal pollution is basically solved. The method breaks through the key bottleneck existing in the soil heavy metal pollution treatment field, a new path is provided for soil heavy metal treatment, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for in-situ continuous soil remediation by means of screw press filtration. Background technique [0002] Soil pollution means that various pollutants produced by human activities enter the soil through various channels, and their quantity and speed exceed the capacity of the soil to accommodate and purify, changing the nature, composition and properties of the soil and destroying the natural environment of the soil. ecological balance, and lead to the natural dysfunction of the soil and the deterioration of soil quality. Soil pollution is one of the pollution problems of the three major environmental elements (atmosphere, water and soil) in the world. The impact and harm caused by soil pollution to the environment and human beings is that it can lead to changes in the composition, structure and function of the soil, thereby affecting the normal growth and deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 陈庆曾军堂
Owner JIANGSU JINGRAN LANDSCAPE CONSTR CO LTD
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