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Method for in-situ remediation of mercury pollution in underground water with magnetite and bauxite slag

An in-situ remediation and bauxite technology, applied in water pollutants, chemical instruments and methods, contaminated groundwater/leachate treatment, etc., can solve the problems of long-term effectiveness and high cost of groundwater, and increase hydraulic retention time , saving construction costs, good stability and safety

Active Publication Date: 2016-06-15
中科华鲁土壤修复工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem to be solved: the purpose of the present invention is to overcome the problems of high cost and long-term ineffective treatment of mercury-contaminated groundwater in situ, and provide a method for in-situ repairing of mercury pollution in groundwater by using magnetite and bauxite slag. Natural magnetite, bauxite slag and sand are used as filling materials for the permeable reaction wall, so that the mercury-contaminated groundwater flowing through the permeable reaction wall can fully contact with natural magnetite and bauxite slag, so as to achieve the goal of remediating mercury pollution in groundwater Purpose

Method used

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  • Method for in-situ remediation of mercury pollution in underground water with magnetite and bauxite slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The hydrological and hydrogeological parameters of the aquifer at a mercury-polluted site are as follows: the medium type of the aquifer is coarse sand, the permeability coefficient is 20m / d, the maximum concentration of mercury pollution is 200μg / L, the width of the pollution plume is 1.6m, and the highest groundwater level is 3.8 m, the depth of the aquifer is 5m underground, and the hydraulic gradient is 0.001.

[0022] 1. Crushing and sieving the slag of natural magnetite and bauxite, the particle size is 0.5-1mm for later use, the mass ratio of natural magnetite and bauxite is 1:1, and the permeability coefficient is 75m / d .

[0023] 2. Take the sand from the natural river, dry it, sieve it, and take the sand with a particle size of 0.5-1mm for use.

[0024] 3. The reaction wall is set downstream of the groundwater pollution plume, perpendicular to the direction of groundwater flow, and the length is 1.2 to 1.5 times the width of the groundwater pollution plume; t...

Embodiment 2

[0038] The hydrological and hydrogeological parameters of the aquifer at a mercury-contaminated site are as follows: the medium type of the aquifer is coarse sand, the permeability coefficient is 20m / d, the maximum concentration of mercury pollution is 50μg / L, the width of the pollution plume is 1.6m, and the highest groundwater table is 3.8 m, the depth of the aquifer is 5m underground, and the hydraulic gradient is 0.001.

[0039] 1. Crushing and sieving the slag of natural magnetite and bauxite, the particle size is 0.5-1mm for later use, the mass ratio of natural magnetite and bauxite is 1:1, and the permeability coefficient is 75m / d .

[0040] 2. Take the sand from the natural river, dry it, sieve it, and take the sand with a particle size of 0.5-1mm for use.

[0041] 3. The reaction wall is set downstream of the groundwater pollution plume, perpendicular to the direction of groundwater flow, and the length is 1.2 to 1.5 times the width of the groundwater pollution plume...

Embodiment 3

[0055] The hydrological and hydrogeological parameters of the aquifer at a mercury-contaminated site are as follows: the medium type of the aquifer is coarse sand, the permeability coefficient is 20m / d, the maximum concentration of mercury pollution is 50μg / L, the width of the pollution plume is 1.6m, and the highest groundwater table is 3.8 m, the depth of the aquifer is 5m underground, and the hydraulic gradient is 0.001.

[0056] 1. Crushing and sieving the slag of natural magnetite and bauxite, take the particle size of 1-1.5mm for later use, the addition ratio of natural magnetite and bauxite is 1:9, and the permeability coefficient is 120m / d .

[0057] 2. Take the sand from the natural river, dry it, sieve it, and take the sand with a particle size of 1-1.5mm for use.

[0058] 3. The reaction wall is set downstream of the groundwater pollution plume, perpendicular to the direction of groundwater flow, and the length is 1.2 to 1.5 times the width of the groundwater pollu...

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Abstract

Disclosed is a method for in-situ remediation of mercury pollution in underground water with magnetite and bauxite slag.The method includes: crushing and sieving natural magnetite slag and natural bauxite slag for standby application; excavating a trench in the lower reach of the underground water pollution plume in the direction vertical to the underground flow, putting uniformly mixed permeable reactive barrier filling materials into the trench, and performing even compaction to obtain a permeable reactive barrier.The magnetite and bauxite can effectively remove mercury in underground water, and meanwhile, acidic mercury-polluted underground water tends to be neutral in pH value after flowing through the reactive barrier.Using the underground water for desorption of active materials loaded with mercury, the results show that the magnetite and bauxite mixture has good stability and safety as the mercury remediation material, and cannot cause secondary pollution to the underground water.By adding a certain proportion of sand, on the premise that usage of the active materials is not increased, thickness of the barrier body can be increased, hydraulic retention time is prolonged, and more construction expense of the PRB (permeable reactive barrier) is saved.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater restoration and treatment, in particular to a method for in-situ restoration of mercury pollution in groundwater by using magnetite and bauxite slag. Background technique [0002] Mercury is a highly toxic heavy metal pollutant that widely exists in soil, surface, and groundwater around the world. Its pollution to groundwater poses a huge threat to human health and ecosystems, especially with groundwater as the main drinking water. water source area. Anthropogenic sources of mercury in soil and groundwater include industrial mining, amalgamation for gold, chlor-alkali production, wood preservation, and nuclear weapon manufacturing. Some anthropogenically released inorganic mercury, especially Hg(II) with high solubility, can be converted into highly toxic organic mercury under certain conditions, causing greater damage to organisms. Therefore, it is very important to develop inorgani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F103/06
CPCC02F1/281C02F2101/20C02F2103/06C02F2303/16
Inventor 宋昕林娜郭亮殷鹏华胡志豪
Owner 中科华鲁土壤修复工程有限公司
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