Magnetic field-based in-situ repair method for polluted groundwater

An in-situ restoration and groundwater technology, applied in the field of water treatment, can solve problems that have not been reported, and achieve the effects of avoiding diffusion, reducing disturbance, and speeding up the flow rate

Inactive Publication Date: 2015-01-21
SHANDONG UNIV
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Problems solved by technology

After searching, there are few reports on domestic patents on nano-iron in-situ remediation technology, and there is no report on the technology of using magnetic field-strengthened nano-iron to repair groundwater.

Method used

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  • Magnetic field-based in-situ repair method for polluted groundwater

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Embodiment 1

[0028] This embodiment is a 4m×4m groundwater area polluted by hexavalent chromium, where the groundwater depth is 1.8m, the thickness of the contaminated layer is 4.5m, the pollutant concentration in the area is 0.67mg / L, and the aquifer medium is powder. Fine sand. Excavate two 1.8mx0.6mx10m (length x width x height) trench-shaped grooves at the downstream boundary of this groundwater contaminated area, and arrange magnets 7 with a thickness of 0.25 meters in the groove-shaped grooves, and the pipe of the extraction pump is down to 6m Place. Two injection wells 1 with a diameter of 0.3m and a well depth of 2.5m were drilled in the upstream area 5.5m away from the trench. Inject 30L of nano-iron suspension with a concentration of 0.3mg / mL into the groundwater in 3 times at a rate of 200mL / min. The injection time interval is 2h. When the concentration of total iron in the iron-rich zone 6 is 0.08mg / ml Start pumping, if less than 0.05mg / ml is to stop pumping, a total of 100L o...

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Abstract

The invention relates to a magnetic field-based in-situ repair method for polluted groundwater, belongs to the technical field of water treatment, and provides a groundwater in-situ repair method capable of solving the problems that nano-iron has low possibility of movement in groundwater and cannot be recycled after repair. The magnetic field-based in-situ repair method comprises the following steps: 1) digging one or more injection wells in the upstream of a polluted groundwater area; 2) digging a ditch-shaped trough in the downstream of the groundwater area; 3) arranging a magnet in the ditch-shaped trough, and reserving a certain area to serve as an iron-rich area; 4) injecting an nano-iron suspension into the polluted groundwater area, wherein nano-iron in the nano-iron suspension moves towards the magnet through the polluted area under the action of magnetic force; 5) starting an extraction pump to extract iron in the iron-rich area. The magnetic force of the magnet provides power for movement of the nano-iron in the groundwater, nano-iron can be enriched in the surface of the magnet after repair, and secondary pollution caused by repair can be avoided only by extracting out the nano-iron.

Description

Technical field [0001] The invention relates to a groundwater in-situ repair method based on a magnetic field, and belongs to the technical field of water treatment. Background technique [0002] At present, groundwater plays an increasingly significant role in water supply security. According to data, 400 cities across the country have already tapped groundwater, and the supply of groundwater accounts for 20% of the total water supply in the country, accounting for 72% and 66% of the water supply in cities in North China and Northwest China. However, due to industrial production, urban development and other reasons, groundwater pollution in our country has become increasingly serious, showing a trend of expansion from point to surface, from shallow to deep. In some areas, groundwater pollution has caused serious harm and endangered the safety of water supply. In view of the seriousness of groundwater pollution, the research and development of groundwater pollution remediation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/48
CPCC02F1/481C02F2103/06
Inventor 黄理辉周实际薛静刘铨刘高风金凤王嫚李刚
Owner SHANDONG UNIV
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