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Organism remediation method of underground water nitrate pollution for solving nitrite accumulation problem

A nitrite and bioremediation technology, applied in the direction of water pollutants, contaminated groundwater/leachate treatment, chemical instruments and methods, etc., to achieve the effect of reducing disturbance

Inactive Publication Date: 2012-09-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of nitrite accumulation in the existing microbial remediation technology for nitrate-contaminated groundwater, and provide a new efficient and economically feasible groundwater nitrate remediation technology

Method used

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  • Organism remediation method of underground water nitrate pollution for solving nitrite accumulation problem
  • Organism remediation method of underground water nitrate pollution for solving nitrite accumulation problem
  • Organism remediation method of underground water nitrate pollution for solving nitrite accumulation problem

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Embodiment Construction

[0015] Set up a biological reaction wall (2) along the vertical direction of the flow of nitrate-contaminated groundwater (1), fill the wall with a solid-phase carrier medium that can slowly release organic carbon sources, and add an oxygen scavenger with a volume ratio of 1-3% , so that anoxic conditions are formed in the wall, and the nitrate in the groundwater is removed through denitrification; the effluent after the restoration of the biological reaction wall (2) still contains a small amount of nitrite, and then mechanical drilling is used to remove nitrite in the biological reaction wall (2) Drill wells in the vertical direction of groundwater flow, fill the wells with solid fillers that slowly release oxygen or directly inject a suspension of medium that slowly releases oxygen into the wells to form an aerobic well (3). under aerobic conditions

[0016] A small amount of nitrite is oxidized to nitrate through nitrification. After this treatment, the concentration of a ...

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Abstract

The invention relates to a method for remediating nitrate pollution in underground water, and the advantage of the method lies in that nitrite accumulation problem caused by conventional microorganism remediation methods is solved. According to the method, a biological reaction wall portion and an aerobic well portion are comprised. The biological reaction wall consists of a solid-phase carrier medium serving as an organic carbon source that can slowly release organic carbon and oxygen capturing agent. The aerobic well is filled with solid filler that can slowly release oxygen, or a suspension of a medium that slowly release oxygen is poured into the aerobic well. The oxygen is released into underground environment by using the aerobic well, so that dissolved oxygen in the environment is improved. Nitration is carried out under an aerobic condition, so that accumulated nitrite is converted into a small mount of nitrate again. The method effectively solves the problem of excessive nitrite in effluent, nitrate content in the final effluent is small, and the concentration of the nitrate in the final effluent is lower than the III classification standard in Quality standard for ground water GB / T 14848-1993, so that no secondary pollution on the underground water will happen.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted groundwater, in particular to a solution to the problem of nitrite accumulation after microbial remediation of nitrate nitrogen polluted groundwater. Background technique [0002] With the rapid development of modern industry, nitrate pollution in groundwater is becoming more and more serious. Nitrate is a serious hazard to human health. If you drink groundwater containing high concentrations of nitrate nitrogen, a large amount of nitrate in the water will be converted into nitrite by microorganisms in the gastrointestinal tract and saliva, and nitrite can make the blood The hemoglobin molecule is oxidized, and the divalent iron in the hemoglobin molecule changes to ferric iron, so that the hemoglobin loses the ability to carry oxygen, causing people and animals to suffer from methemoglobinemia due to hypoxia, and even death in severe cases. In addition, nitrates in groundwater ha...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F101/16C02F103/06
Inventor 艾小凡王鹤立
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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