Method for treating hexavalent chromium ions in soil by combining grouting with electroosmosis

A technology of hexavalent chromium ion and electroosmotic treatment, which is applied in soil protection, restoration of polluted soil, construction, etc. Infiltration construction period, improve treatment effect, increase the effect of conductivity

Active Publication Date: 2019-05-14
湖南宏禹工程集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common repair agents for chemical reduction and solidification stabilization methods include cement, lime, biochar, phosphate rock powder and other materials. By mixing with contaminated soil evenly, using physical wrapping, chemical adsorption and crystallization and precipitation, etc., the hexavalent chromium soil is restored and stabilized. Solidification is stable, but there are still problems such as in-situ treatment, complicated construction process, and difficult to guarantee the reduction effect

Method used

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  • Method for treating hexavalent chromium ions in soil by combining grouting with electroosmosis
  • Method for treating hexavalent chromium ions in soil by combining grouting with electroosmosis

Examples

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Embodiment 1

[0044] A method for grouting combined with electroosmotic treatment of hexavalent chromium ions in soil, comprising the following steps:

[0045] (1) Construction preparation: prepare grouting pumps, grouting pipelines, pulping stations, grouting materials and electroosmotic devices, and conduct quality inspections of materials and equipment;

[0046] (2) Positioning drilling: determine the site and measure the stakeout, drill through the drilling rig to the predetermined depth of the soil layer to be treated according to the design drawings, and install grouting pipes and conductive plastic pipes, wherein the grouting holes 1 are arranged in single rows and each row is grouted The hole 1 interval is 2.5m, the interval between the holes is 1m, the cathode 2 and the anode 3 conductive plastic tubes are installed side by side on both sides of the grouting hole 1, and the interval k between the cathode 2 and the anode 3 in the electrode pair on the same side is 0.5m. The interval...

Embodiment 2

[0056] The treatment method in this example is the same as that in Example 1, except that the ratio of the reducing solution is different. The specific preparation process of the reducing solution is as follows: 1 part of organic acid, 0.3 part of antimony trioxide and 20 parts of water Mix and stir until completely dissolved, then add 4 parts of manganese sulfate, 50 parts of ferrous sulfate, 0.3 parts of disperse anionic surfactant and 80 parts of water, stir until completely dissolved and pass through a 200-mesh sieve, and store for future use.

[0057] Using the combined grouting and electroosmotic treatment method in this example, the removal and fixation effect of hexavalent chromium ions is good. Using the same treatment process, the final concentration of hexavalent chromium ions in the aqueous solution at the cathode 2 is slightly higher than that in Example 1.

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Abstract

The invention discloses a method for treating hexavalent chromium ions in soil by combining grouting with electro-osmosis. The method includes the steps: S1 drilling holes in the soil to be treated, setting grouting holes, and arranging negative electrodes and positive electrodes of electro-osmosis devices on the peripheries of the grouting holes; S2 injecting grouting materials with reduction, adsorption and gelatinizing performances into the grouting holes through an injection pump, and starting the electro-osmosis devices after grouting is completed to perform electro-osmosis treatment; S3collecting water solution at negative electrodes of the electro-osmosis devices, detecting the concentration of the hexavalent chromium ions in the water solution, stopping construction if the concentration of the hexavalent chromium ions meets design requirements, and repeating the step S2 and the step S3 if the concentration of the hexavalent chromium ions cannot meet design requirements. A grouting treatment method and an electro-osmosis treatment method are combined, so that the method is simple and convenient to operate, short in treatment period, large in treatment area, high in efficiency and applicable to soil layers with all natures.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a method for treating hexavalent chromium ions in soil. Background technique [0002] The environmental pollution caused by chromium and its compounds mainly comes from human industrial activities, such as the leftover sites of chromium salt factories, chromium slag storage sites, discharge of industrial chromium-containing wastes, chromium slag produced in cement, metallurgy, and chemical production, etc. . All chromium compounds are toxic, among which hexavalent chromium exists in the form of cations, is not easily absorbed by the soil, has high activity, can penetrate cell membranes, seriously damage the human digestive tract, respiratory tract, skin and mucous membranes, and will be transferred along the food chain , enrichment, and accumulation in animals and plants, the most toxic, has been confirmed by the International Agency for Research on Cancer (IARC) as a str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00C04B28/10E02D3/12E02D3/11C04B111/70
Inventor 黄晓倩贺茉莉宾斌
Owner 湖南宏禹工程集团有限公司
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