A device and method for eliminating underground water arsenic pollution

A technology for groundwater and arsenic pollution, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, water/sewage multi-stage treatment, etc., can solve problems such as easy hardening, low efficiency, waste, etc., and achieve improved removal Arsenic efficiency, anti-hardening effect

Inactive Publication Date: 2018-01-09
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of using membranes to treat arsenic-polluted water bodies, due to the interception effect of the membranes, the concentration of arsenic in the retained part of the water body is relatively high, and the treatment of high-arsenic concentrated water is the focus of research and the challenges and main challenges in practical applications. bottleneck
[0005] As an efficient, cheap, and easy-to-operate technology, zero-valent iron arsenic removal technology has received widespread attention, but it has problems such as low efficiency and easy hardening in the process of arsenic removal, especially when the arsenic concentration is low, there will be waste. question

Method used

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  • A device and method for eliminating underground water arsenic pollution
  • A device and method for eliminating underground water arsenic pollution
  • A device and method for eliminating underground water arsenic pollution

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The concentration of heavy metal arsenic in the groundwater extracted from an agricultural production area in the north is 105 μg / L. According to the results of regional hydrogeological data, the designed pumping well depth is 22m, the diameter of the well pipe is 96mm, the length of the screen is 4.5m, and it is located 3.0m below the water level. ; The activated carbon and small particle fine sand filled in the pretreatment area are filled according to the mass ratio of 65:35. The permeable membrane in the treatment area is a commercial microfiltration membrane, and the nano aeration equipment is used to aerate oxygen. The mass ratio is 25:50:25, filled with waste iron chips, activated carbon and sand with a particle size of 20-50mm. When the whole device is running, it pumps water intermittently. After pumping for 4 hours, the pumping is stopped, and the nano-aeration equipment is turned on while adding zero-valent iron. Run within 50 days. The average daily water t...

Embodiment 2

[0050] The concentration of heavy metal arsenic in groundwater extracted from an agricultural production area in the north is 408 μg / L. According to the results of regional hydrogeological data, the designed pumping well has a depth of 14m, a well pipe diameter of 104mm, and a screen pipe length of 3.5m, located 2.0m below the water level. ; The activated carbon and small particle fine sand filled in the pretreatment area are filled according to the mass ratio of 70:30. The permeable membrane in the treatment area is a commercial microfiltration membrane, and the nano aeration equipment is used to aerate oxygen. The mass ratio is 30:40:30 filled with scrap iron chips, activated carbon and sand with a particle size of 10-50mm. When the whole device is running, it pumps water intermittently. After pumping water for 2 hours, stop pumping water, and start the nano-aeration equipment while adding zero-valent iron. Run within 60 days. The average daily water treatment volume is 80m...

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Abstract

A device for eliminating underground water arsenic pollution is provided. The device includes a water suction system, a reinjection system and a treatment system between the water suction system and the reinjection system. According to the water suction system, a water suction pump is disposed in a water suction well, and is connected to a pretreatment zone in the treatment system through a watersuction pipe, and the water suction pump is connected to a flow rate controller. The treatment system includes the pretreatment zone and a treatment zone, wherein the pretreatment zone is a layer filled with activated carbon and fine sand, a water inlet of the pretreatment zone is connected to the water suction pump through the water suction pipe, the upper end of the treatment zone is provided with a zero-valent iron feeding device, the lower end of the treatment zone is provided with a nanometer aeration device, one end of the treatment zone is provided with an osmotic membrane, and a wateroutlet of the treatment zone is connected to a reinjection well of the reinjection system. The reinjection well of the reinjection system is filled with a reinjection filler. A method for eliminatingunderground water arsenic pollution by utilizing the device is also disclosed.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration, and in particular relates to a device for repairing arsenic pollution in groundwater. [0002] The invention also relates to a method for repairing arsenic pollution in groundwater by using the device. Background technique [0003] Arsenic pollution in groundwater seriously affects people's drinking water safety. Drinking arsenic-contaminated groundwater can lead to cancer, such as skin cancer, lung cancer, and gastric cancer. Arsenic pollution is mainly composed of natural sources and sources of human activities, and the pollution situation is becoming more and more serious, especially the potential pollution caused by the mining of a large amount of arsenic-containing metals, the burning of coal, the use of arsenic-containing pesticides, preservatives and arsenic products. risk. There is an urgent need to remediate arsenic-contaminated groundwater to ensure drinking water safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/06
Inventor 姜永海席北斗彭星杨昱马志飞廉新颖张妍夏甫徐祥健
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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