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A Magnetic Field-Based In-Situ Remediation Method for Contaminated 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: 2016-06-08
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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  • A Magnetic Field-Based In-Situ Remediation Method for Contaminated Groundwater

Examples

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Embodiment 1

[0028] This example is a 4m×4m groundwater area polluted by hexavalent chromium, in which the buried depth of groundwater is 1.8m, the thickness of the polluted layer is 4.5m, the concentration of pollutants in the area is 0.67mg / L, and the aquifer medium is powder fine sand. Excavate two grooves of 1.8mx0.6mx10m (length x width x height) at the downstream boundary of this groundwater pollution area, and lay magnets 7 with a thickness of 0.25 meters in the grooves, and the pipe of the extraction pump goes down to 6m place. Two injection wells 1 with a diameter of 0.3m and a depth of 2.5m are 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 three times at a rate of 200mL / min, with an injection time interval of 2h. When the concentration of total iron in the iron enrichment zone 6 is 0.08mg / ml Start pumping, if it is less than 0.05mg / ml, stop pumping, and pump out a total of 100L of...

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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 restoration 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 exploited groundwater, and the supply of groundwater accounts for 20% of the total water supply in the country, and accounts for 72% and 66% of the water supply in North China and Northwest China respectively. However, due to industrial production, urban development and other reasons, my country's groundwater pollution is becoming more and more serious, showing a trend of expansion from point to surface, from shallow to deep. In some areas, groundwater pollution has caused serious harm, endangering the safety of water supply. In view of the seriousness of groundwater pollution, it is imminent to develop groundwater pollution remediatio...

Claims

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Application Information

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Patent Type & Authority Patents(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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