Closed in-situ leaching, extracting and stabilizing remediation method for mercury-contaminated soil

A remediation method, mercury-polluted technology, applied in the field of industrial mercury-contaminated soil remediation, can solve the problems of high excavation, packaging, transportation, soil mercury content reduction mercury migration, lack of comprehensive and effective means, etc., to achieve economic benefits and Significant social benefits, reduced dissolution and migration, and improved process safety

Inactive Publication Date: 2020-09-15
北京万之悦科技发展有限公司
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned thermal analysis method and chemical leaching method both take out the contaminated soil and transport it to the treatment site for disposal. It is an ex-situ treatment, which requires high requirements for excavation, packaging, transportation and other processes, and the treatment process is likely to cause secondary pollution.
The in-situ remediation method proposed in the Chinese patent (CN201810596640.1) is to lay an anti-seepage layer on the in-situ solidified layer of mercury-contaminated soil, and plant vegetation on the anti-seepage layer. migration problem
For the disposal of heavily mercury-contaminated soil, there is a lack of comprehensive and effective means. It is necessary to reduce the total mercury content in the soil to meet environmental protection requirements, and to avoid secondary pollution caused by soil disturbance and excavation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The soil of an industrial plot is polluted by mercury metal leakage, the soil is mainly silt soil, the average mercury content is 150mg / kg, the depth of contaminated soil is 3m~8m, and the area is 100m 2 . Step 1: Using the segmented curtain grouting method, inject the slurry composed of ordinary Portland cement, first-grade fly ash and water into the bottom and surrounding areas of the soil to form an average thickness of 3m from -8 meters to -11 at the bottom and an average thickness of 3m at the periphery. 2m anti-seepage reinforcement shell. The second step: vertically arrange the suction filter pipe in the soil in the anti-seepage shell, the bottom 15cm of the pipe is provided with a percolation hole, and the upper port is connected with a suction filter pump, and the eluent A (potassium persulfate 0.5mol / L, sodium chloride 0.1mol / L, citric acid 0.2mol / L, sodium dodecylbenzene sulfonate 0.001mol / L aqueous solution) sprayed from the surface, pumped out from the suc...

Embodiment 2

[0025] The soil of a mine storehouse is polluted by mercury metal leakage. The soil is mainly silt soil, and the average mercury content is 300mg / kg, expressed as Hg 2+ The valence state is dominant, the depth of polluted soil is 10m deep, and the area is 1000m 2 . Step 1: Using the segmented curtain grouting method, inject the slurry consisting of ordinary Portland cement, first-grade fly ash and water into the bottom and surrounding areas of the soil to form an average thickness of 4m from -10m to -14 at the bottom and 4m around the perimeter. 3m anti-seepage reinforcement shell. Step 2: Vertically arrange the suction filter pipe in the soil in the anti-seepage shell. There is a percolation hole at the bottom 15cm of the tube, and the suction filter pump is connected to the top of the tube. L, the aqueous solution of sodium dodecylbenzenesulfonate 0.001mol / L) is sprayed from the surface, is drawn out from the suction filter pipe and sprayed again, circulates several times,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a closed in-situ leaching, extracting, stabilizing, solidifying and repairing process method for mercury-contaminated soil. Based on a place with serious soil mercury pollution, a curtain grouting method is firstly adopted to form a continuous closed impermeable shell at the bottom and the periphery of a mercury-polluted soil area, then a vertical suction filtration pipe system is arranged in the closed mercury-polluted soil, and a leaching liquid A and a leaching liquid B are respectively sprinkled, permeated and leached from the surface of the soil and are extractedfrom the bottom of the impermeable shell through a suction filtration system; and after the soil is leached, a mercury passivator C and a curing agent D are fully and uniformly mixed with the soil byadopting large jet grouting pile stirring equipment to form a stable mercury compound, and the mercury compound and the soil are cured together to form a stable soil body structure which is safe and reliable for a long time. The method is especially suitable for in-situ treatment and soil remediation engineering of soil mercury heavy pollution caused by industrial production and mercury leakage, and is also suitable for remediation of soil heavily polluted by other heavy metals.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of heavy metal polluted soil, and in particular relates to a method for remediating industrial mercury heavily polluted soil. Background technique [0002] Mercury (Hg) is continuously released into the atmosphere, water and soil along with human life and industrial activities. It is a heavy metal that is extremely harmful to humans and organisms. There are many ways for mercury to pollute soil, and the global pollution is becoming more and more serious. If soil mercury pollution is not treated, especially the disposal of heavy pollution, Hg will migrate and spread in the soil with time, which will affect water sources, food and human health. Therefore, remediation of mercury-contaminated soil is an important task to protect human survival and maintain ecological security. [0003] There are many methods for the remediation of mercury-contaminated soil, including physical therma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 赵立新其他发明人请求不公开姓名
Owner 北京万之悦科技发展有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap