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Device and method for repairing underground water nitrate pollution

A groundwater and nitrate technology is applied in the field of remediation devices for remediating nitrate-contaminated soil and groundwater in saturated soft soil areas, which can solve the problems of PRB having no obvious remediation effect, destroying hydrogeological conditions, occupying a large area of ​​land, etc., and achieving increased remediation. Efficiency, cost reduction, energy saving effect

Inactive Publication Date: 2013-02-13
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

If the permeability coefficient of the soil layer in the polluted area is small and the groundwater flow rate is small, the traditional PRB has no obvious repair effect; when the groundwater is repaired in a large area, the traditional PRB repair technology needs to excavate a large area and occupy a large area Land and serious damage to hydrogeological conditions, and require a lot of economic expenditure

Method used

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  • Device and method for repairing underground water nitrate pollution
  • Device and method for repairing underground water nitrate pollution
  • Device and method for repairing underground water nitrate pollution

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Embodiment 1

[0045] Conditions in this area: the buried depth of the groundwater level is 3m, the vadose zone and the aquifer are mainly soft soil, the average particle size is -7 cm / s. Groundwater quality in the polluted area: PH is 8.2; ORP is 128mV; nitrate concentration in groundwater is 125mg / L. Restoration device: inner diameter of water injection well and pumping well pipe is 5cm; annular PRB thickness is 15cm; retaining wall thickness is 2cm; pump speed is 300ml / min.

[0046] 90 days after the operation was stable, the water quality was monitored, and the results showed that there was no obvious subsidence on the ground, and the treatment effect on nitrate nitrogen was good. The average concentration after treatment was 12.3-16.7mg / L, and there was no clogging, and the average removal rate reached more than 87%. .

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Abstract

A device for repairing underground water nitrate pollution mainly comprises a pumping well and at least one water injection well, wherein a water suction pump is installed in a well pipe of the pumping well, a boosting pump is installed at the top of a well pipe of the water injection well, and the well pipe of the water injection well is connected with a pipeline for conveying carbon sources; well sieves are installed on the parts of the well pipes of the pumping well and the water injection well under the water level; a water conveying pipeline is connected between the water suction pump and the boosting pump; and the well pipes of the pumping well and the water injection well are respectively installed in respective protecting walls with pores of the pumping well and the water injection well, and filling materials are filled between the well pipes and the protecting walls to form a permeable reaction wall. The invention further discloses a method for repairing underground water nitrate pollution by utilizing the device.

Description

technical field [0001] The invention belongs to the technical field of groundwater restoration, and in particular relates to a restoration device for restoring groundwater in nitrate-polluted soil in a saturated soft soil area. [0002] The invention also relates to a method for effectively repairing groundwater nitrate pollution by using the repair device. Background technique [0003] Groundwater is one of the guarantees for the survival of human beings around the world. With the increasing prosperity of the society, the demand for groundwater in my country's industrial and agricultural development is increasing day by day. The harm of nitrate pollution has been widely paid attention to by people. Excessive nitrate in drinking water can cause methemoglobinemia in infants and young children, making the blood unable to transport oxygen. This is a potentially fatal environmental problem. It is also reported that excessive nitrate in drinking water is also one of human carci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
Inventor 席北斗白顺果姜永海李翔袁志业安达杨昱张进保
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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