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Underground water in-situ arsenic removal method combining single-well arsenic removal and water-bearing stratum arsenic immobilization

A groundwater and water layer technology, applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, reduced water/sewage treatment, etc., can solve the problems of inability to cover the water-bearing surface, lower arsenic removal process efficiency, and arsenic removal effect Weakness and other problems, to achieve the effect of continuous arsenic removal, easy maintenance and water quality improvement

Inactive Publication Date: 2017-12-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

The current in-situ arsenic removal process in groundwater mainly includes oxidation method and reduction method, but the treatment area is feather-shaped, which cannot cover the surface of the aquifer. Differences, especially the different redox environments, will lead to a decrease in the efficiency of a single arsenic removal process and prone to secondary pollution

Method used

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  • Underground water in-situ arsenic removal method combining single-well arsenic removal and water-bearing stratum arsenic immobilization
  • Underground water in-situ arsenic removal method combining single-well arsenic removal and water-bearing stratum arsenic immobilization
  • Underground water in-situ arsenic removal method combining single-well arsenic removal and water-bearing stratum arsenic immobilization

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Embodiment 2

[0070] The method of Embodiment 1 of the present invention is used to remove arsenic on the test site in Daying Village, Shanyin County. Taking the shallow layer 20m from the surface as an example, divide the five districts, and use the weak alkaline partial oxidation of arsenic Taking area Ⅰ and medium-alkali reduced high-arsenic area Ⅱ as examples, the influence range is approximated as a rectangle, and the unit system covers an area of ​​about 56×75m 2 ; Set the pumping well 3 in the direction parallel to the regional groundwater flow direction, and set four injection wells 2 on the upstream vertical groundwater flow direction straight line.

[0071] Before the injection process starts, four monitoring wells 1 are respectively set up to form a water chemical monitoring network in the pumping injection system. Before the start of the experiment, water samples from pumping well 3, monitoring well 1, and injection well 2 were taken to measure the background value of arsenic an...

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Abstract

The invention discloses an underground water in-situ arsenic removal method combining single-well arsenic removal and water-bearing stratum arsenic immobilization. Through field hydrogeological survey and hydrochemical region division, the regional arsenic removal and the single-well arsenic immobilization are combined; an arsenic removal effect monitoring system is built; an oxidation method or a reduction method is respectively used for removing arsenic in the water phase of the water-bearing stratum in different regions. An injected ferrous reagent is uniformly distributed in the controlled region range; a certain concentration of arsenic removal ferrous reagent combination is introduced in the injection process; when the ferrous reagent is oxidized or precipitates, the arsenic can be separated from the surface of a medium and can be covered on the water-bearing stratum medium; meanwhile, the arsenic in underground water can be adsorbed or coprecipitated; in weak region regulation and control regions, a single-well filter material arsenic removal technology is used; the arsenic immobilization comprehensive coverage is promoted; in addition, the removal efficiency of the water phase arsenic in the water outlet single well can be improved; the high-arsenic underground water in-situ improvement combining region regulation and control arsenic immobilization and single-well in-situ arsenic removal is realized; the arsenic removal effect is good; the secondary pollution is smaller.

Description

technical field [0001] The invention belongs to the technical field of in-situ restoration and purification of groundwater, and specifically relates to a method for in-situ arsenic removal in groundwater by combining single-well arsenic removal and aquifer arsenic fixation point and surface through site hydrogeological investigation and hydrochemical zoning. Background technique [0002] Arsenic is a toxic element in nature, which is found in more than 200 kinds of minerals in nature. Arsenic in rocks and sediments enters groundwater through biogeochemical and hydrogeological processes. When the arsenic content in groundwater exceeds the World Health Organization (WHO) drinking water standard of 10 μg / L, it can be considered as high-arsenic groundwater. Arsenic exists mainly in the form of complex anions of As(III) and As(V) in groundwater, and the arsenic in groundwater is mainly As(V) and As(III) under oxidative and reducing environmental conditions, of which As(III ) is...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/70C02F101/10C02F103/06
CPCC02F1/70C02F1/72C02F2101/103C02F2103/06C02F2209/001
Inventor 谢先军薛肖斌王志强皮坤福柳亚清朱亚鹏冯宇马腾苏春利郝义国王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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