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In-situ cadmium removal method for underground water

A groundwater and in-situ technology, applied in chemical instruments and methods, water/sewage treatment, flotation water/sewage treatment, etc., can solve the problem that the treatment effect is difficult to be guaranteed, and achieve long operation period and high removal efficiency Effect

Inactive Publication Date: 2012-07-25
JILIN JIANZHU UNIVERSITY
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Problems solved by technology

Ex-situ treatment technology is mainly used for groundwater seriously polluted by cadmium, and in-situ treatment technology is mainly used for groundwater slightly polluted by cadmium. Although adsorption or metal reduction methods can effectively remove cadmium in groundwater, the adsorption medium is very difficult after a period of reaction. It is easy to reach saturation, and the treatment effect is difficult to guarantee due to the passivation of the surface of the metal medium after the metal medium has reacted for a period of time

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  • In-situ cadmium removal method for underground water

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention will be further described: as figure 1 as shown, A method for removing cadmium in situ from groundwater, consisting of an injection well 1, an ion flotation grid, and a foam-enhanced separation well 10; it is characterized in that the specific steps are as follows: firstly, the cadmium-contaminated groundwater flows into the injection well 1, and the dosing pump 12 The surfactant is pumped into the injection well 1 through the dosing pipe 2, mixed with the cadmium-contaminated groundwater in the injection well 1, and then enters the water distribution area 4 of the ion flotation grid, and the ground water flows upward along the packing layer 5 through the water distribution area 4 At the same time, under the action of the blower 13, the air enters the packing layer 5 in the form of tiny bubbles through the aeration tube 3 arranged at the bottom of the ion flotation grid, and the bubbles in the packi...

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Abstract

The invention relates to an in-situ cadmium removal method for underground water. The in-situ cadmium removal method is characterized by comprising the following steps that: cadmium-polluted underground water flows into an injection well, mixed with an added surface active agent in the injection well and then enters an ion flotation grating which is provided with an aerator pipe at the bottom, a great amount of air bubbles are separated when cadmium ions attached on the surfaces air bubbles in the underground water rise to a bubble chamber of the ion flotation grating under the action of air turbulence, and the bubbles are further removed from discharged water through a bubble strengthening separation well so as to improve the quality of the discharged water. The in-situ cadmium removal method of the underground water, disclosed by the invention, has the advantages of high cadmium removal efficiency and long stably running period of a system, and can economically and effectively repair the cadmium-polluted underground water in situ.

Description

technical field [0001] The invention relates to a method for removing cadmium in situ from groundwater, which uses foam flotation to remove cadmium in groundwater, and belongs to the technical field of groundwater restoration. Background technique [0002] With the rapid development of industry and the sharp increase of human activities, cadmium is widely used in the production of electroplating, smelting alloys, pigments, batteries, plastics, etc., and enters the environment in the form of waste gas, waste water, and waste residues during production and use. Cadmium in these "three wastes" substances enters groundwater along with sedimentation, rainwater leaching and sewage infiltration. The toxicity of metal cadmium is very low, but its compounds are very toxic. Drinking groundwater with excessive cadmium will cause serious harm to human health. , can cause "bone pain disease". Animal experiments have shown that the minimum lethal dose for mice is 50mg / kg, and the cadmiu...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/62
Inventor 李广韩相奎李真莹
Owner JILIN JIANZHU UNIVERSITY
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