Method for remediating pollution of nitrate nitrogen in underground water

A technology for nitrate nitrogen and groundwater, applied in water pollutants, contaminated groundwater/leachate treatment, chemical instruments and methods, etc., can solve problems such as difficulty in inflammability and explosion, low ammonia nitrogen generation ratio, and increased cost. Achieve low-cost and high-efficiency treatment effects, low ammonia nitrogen generation ratio, and convenient operation

Inactive Publication Date: 2010-08-18
NANKAI UNIV
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  • Claims
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Problems solved by technology

In addition, a large number of studies have shown that biological denitrification technology can be well used for the restoration of nitrate nitrogen in groundwater, and the proportion of ammonia nitrogen generation is low, but there are still many problems, such as heterotrophic denitrification is easy to cause organic matter residues, causing groundwater pollution. Aquifer plugging; while autotrophic denitrification usually uses H 2 as an electron donor, but due to the H 2 The flammable and explosive characteristics also increase the difficulty and cost of the operation process
It can be seen that if the above-mentioned various remediation technologies are used alone to treat groundwater nitrate nitrogen, there is a certain degree of deficiency.

Method used

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  • Method for remediating pollution of nitrate nitrogen in underground water
  • Method for remediating pollution of nitrate nitrogen in underground water
  • Method for remediating pollution of nitrate nitrogen in underground water

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preparation example Construction

[0033] (1) Nano Fe 0 Particle preparation

[0034] FeSO 4 ·7H 2 O was dissolved in ethanol-water system with PEG-4000 as dispersant, and argon gas was passed through to remove oxygen, and then KBH was added 4 Aqueous solution, stirring while adding dropwise, continue to stir and react for 40-60min after the dropwise addition, to obtain black nano-Fe 0 solution; nano-Fe was selected by magnetic separation 0 Particles, washed with deoxygenated deionized water;

[0035] (2) Preparation of Nano-Fe / Cu Particles

[0036] CuSO 4 ·5H 2 The aqueous solution of O was added to the nano-Fe 0 In the particles, continue to stir and react to prepare nano-Fe / Cu particles;

[0037] (3) Preparation of reaction solution

[0038] Adding deionized water to dilute the denitrifying bacteria liquid and the culture liquid to prepare the reaction liquid;

[0039] (4) Preparation of reaction system

[0040] Deoxidize the reaction solution and introduce it into the nano-Fe / Cu particles to pre...

Embodiment 1

[0050]The method is used to remove nitrate nitrogen with a concentration of 30 mg / L in groundwater. Among them, the FeSO used in the preparation of nano-Fe / Cu particles 4 ·7H 2 O and KBH 4 The molar ratio of PEG-4000 and FeSO is 1:3 4 ·7H 2 The O mass ratio is 1:2, the ethanol-water volume ratio is 1:4, the stirring reaction time is 50min, the dosage of nano-Fe / Cu particles is 0.40g / L (Cu loading is 10%), and then the reaction Nitrifying bacteria solution (OD 420 =0.0027): culture solution: the volume ratio of deionized water is 5:2:13, carry out simple physical mixing, seal, adjust the solution pH=8.6, carry out oscillation reaction, its temperature is controlled at 30 ℃, and rotating speed is 140rpm. Regular sampling, analysis of reactant NO 3 - -N and product NH 4 + -N content changes with time. The analysis method is: NO 3 - -N: UV spectrophotometry; NH 4 + -N: Nessler's reagent spectrophotometry. Analysis results such as figure 2 and image 3 As shown, i...

Embodiment 2

[0052] The method is used to remove nitrate nitrogen with a concentration of 50 mg / L in groundwater. Among them, the FeSO used in the preparation of nano-Fe / Cu particles 4 ·7H 2 O and KBH 4 The molar ratio of PEG-4000 and FeSO is 1:5 4 ·7H 2 The mass ratio of O is 1:1, the volume ratio of ethanol to water is 2:5, the stirring reaction time is 40min, the dosage of nano-Fe / Cu particles is 0.57g / L (different Cu loading), and then denitrifying bacteria are added Bacterial solution (OD 420 =0.0046): the volume ratio of culture solution: deionized water is 7:2:13, simple physical mixing is carried out, sealed, the pH of the solution is adjusted to 7.5, and the oscillation reaction is carried out. The temperature is controlled at 30°C and the rotating speed is 150rpm. Regular sampling, analysis of reactant NO 3 - -N and product NH 4 + -N content changes with time. The analysis method is: NO 3 - -N: UV spectrophotometry; NH 4 + -N: Nessler's reagent spectrophotometry. A...

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Abstract

The invention relates to a method for remediating pollution of nitrate nitrogen in underground water, which mainly comprises the following steps: firstly, preparing Fe/Cu nanoparticles by liquid phase reduction step by step: under the protection of argon gas, reducing a FeSO4.7H2O solution with a KHB4 solution to prepare FeO nanoparticles, then introducing a CuSO4.5H2O solution into the FeO nanoparticles for continuously stirring for reacting, after reacting, washing the nano Fe/Cu solution with deoxidized and deionized water, and then, selecting the Fe/Cu nanoparticles by a magnetic method; secondly, introducing the deoxidized reaction solution into the prepared Fe/Cu nanoparticles for physically mixing simply; and finally, adding underground water containing nitrate nitrogen and sealing to carry out oscillating reaction. The method has high efficiency for remediating pollution of nitrate nitrogen in underground water, has simple required equipment and convenient operation, and provides a new way for remediating pollution of nitrate nitrogen in underground water with high efficiency and low cost.

Description

technical field [0001] The invention relates to a method for repairing groundwater nitrate nitrogen pollution. Specifically, it is a method of jointly removing nitrate nitrogen from groundwater by using the chemical reduction of nanometer Fe / Cu and the denitrification of denitrifying bacteria (Alcaligenes eutrophus). Background technique [0002] Nitrate nitrogen mainly comes from domestic sewage and waste manure, chemical fertilizers, industrial wastewater, dry and wet deposition of atmospheric nitrogen oxides, and sewage irrigation. In view of the fact that the occurrence of many human diseases is closely related to the pollution of nitrate nitrogen, such as cancer, methemoglobinemia, lymphoma, etc., the research on nitrate nitrogen remediation technology in groundwater has attracted more and more attention. [0003] At present, the technologies used for nitrate nitrogen remediation at home and abroad mainly include biological denitrification, ion exchange, reverse osmosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/16C02F103/06
Inventor 金朝晖李铁龙夏宏彩安毅
Owner NANKAI UNIV
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