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Aquifer nitrate denitrification rate in-situ determination method and device

A measurement method and denitrification technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of immature and accurate methods of denitrification rate in aquifers, and achieve the effect of improving authenticity and accuracy

Inactive Publication Date: 2020-04-24
TECH CENT FOR SOIL AGRI & RURAL ECOLOGY & ENVIRONMENT MINIST OF ECOLOGY & ENVIRONMENT +1
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Problems solved by technology

[0009] In general, due to the complexity and uncertainty of hydrogeological conditions in the field, the migration and transformation process of nitrogen, and the hydrogeochemical environment, the method of measuring and calculating the denitrification rate of aquifers through in-situ experiments is not mature and accurate enough. to be explored in depth

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  • Aquifer nitrate denitrification rate in-situ determination method and device
  • Aquifer nitrate denitrification rate in-situ determination method and device
  • Aquifer nitrate denitrification rate in-situ determination method and device

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Embodiment

[0068] In the following, the present invention will be further specifically explained in conjunction with the accompanying drawings and examples of implementation.

[0069] The aquifer medium of a certain site is mainly silty sand deposited in the Quaternary Period, and the groundwater flows from northwest to southeast. The water supply degree of the aquifer is taken as 0.15, and the bulk density of the aqueous medium is taken as 2.5g / cm 3 . A total of 3 groundwater wells #1 to #3 are arranged along the direction of groundwater flow, with an average depth of about 30m. The filter flower tubes installed in the wells are buried at a depth of 28-29m, the buried depth of the groundwater table is 20.6-26.0m, and the thickness of the aquifer is about 1.40-5.50m.

[0070] according to figure 1 , In-situ injection experiments were carried out in groundwater wells #1, #2 and #3, and the denitrification rate of the aquifer was measured.

[0071] (1) Test procedure

[0072] ①Extracti...

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Abstract

The invention relates to an aquifer nitrate denitrification rate in-situ determination method. The method comprises the following steps of 1) extracting underground water of a specific aquifer, and adding isotope labeled KNO3 (<15>N) and KBr medicaments; 2) injecting the underground water in the step (1) into a downhole predetermined depth; 3) after injection in the step (2) is completed, collecting underground water samples into a container at different moments, replacing isopyknic water samples with helium, collecting an upper-layer gas in the container, and extracting a gas product; and 4)determining a concentration of an sotope gas <15>N2O-N+<15>N2-N in a gas product extracted in the step 3), meanwhile, measuring the concentrations of tracers <15>N and Br<-> in the underground water sample collected at different moments and the concentration of a residual quantity of a reactant, drawing a concentration penetration curve according to a relationship between the concentration of eachtest factor and time, and calculating the denitrification rate of nitrate in the aquifer by adopting a <15>N isotope tracer method. The invention also discloses a device for realizing the method.

Description

technical field [0001] The invention belongs to the field of water environment protection, and in particular relates to an in-situ determination method for the nitrate denitrification rate of an aquifer. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] In recent decades, NO 3 -N, as the most common pollution factor in groundwater worldwide, poses a certain threat and harm to human health. Groundwater has a certain self-purification ability, and the purification of NO 3 The main mechanism of -N is denitrification. Denitrification in aquifers is NO 3 -N is converted to N under the action of microorganisms 2 O or N 2 the process of. The stronger the denitrification, the stronger the self-purification ability of nitrate in groundwater. Therefore, mastering the intensity of denitrification in aquifers can provide an important theoretical basis for the prevention, control and restoration of nitrate pollution i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 郇环姜永海张军军耿宏志刘兵杨昱贾永锋廉新颖马雄飞
Owner TECH CENT FOR SOIL AGRI & RURAL ECOLOGY & ENVIRONMENT MINIST OF ECOLOGY & ENVIRONMENT
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