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Method and device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through low-intensity magnetic field

A technology of iron-carbon micro-electrolysis and nitrate nitrogen is applied in the field of denitrification to achieve the effects of increasing hydraulic retention time, improving electron donating ability and avoiding secondary pollution

Inactive Publication Date: 2021-11-09
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the iron-carbon micro-electrolytic autotrophic denitrification system, although the denitrification rate is significantly higher than that of zero-valent iron autotrophic denitrification due to the galvanic reaction, it is different from the direct supply of H 2 Compared with the current hydrogen autotrophic denitrification process, it is still slow, and the corrosion hydrogen evolution is still the rate-limiting step of the process.

Method used

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  • Method and device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through low-intensity magnetic field
  • Method and device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through low-intensity magnetic field
  • Method and device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through low-intensity magnetic field

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Effect test

Embodiment 1

[0048] use figure 1 In the shown device, the iron-carbon carrier is filled on the porous carrier support plate 2 in the reactor 1, and the nitrate nitrogen-containing water to be treated in the water inlet bucket 9 is passed through the water inlet pipeline 10, the water inlet pump 11, and the water inlet 12 enters the reactor 11, inoculates the activated sludge on the iron-carbon carrier, and controls the temperature at 20-30°C through the water bath circulation system and the temperature control sensor 4, and the weak magnet provided by the first permanent magnet 81 and the second permanent magnet 82 Under the condition of magnetic field, the biofilm is cultivated, and the parameters of microorganisms in the biofilm are monitored through the upper mud port 71, the middle mud port 72 and the lower mud port 73. After the carrier is attached to the biofilm, iron-carbon micro-electrolysis autotrophic denitrification is carried out to obtain In addition to nitrate nitrogen efflue...

Embodiment 2

[0050] use figure 2 In the shown device, the iron-carbon carrier is filled in the reactor 21 (the filling volume fraction is 50-60%), and the feed water containing nitrate nitrogen to be treated is added into the reactor, and the distance between the two NdFeB permanent magnets is adjusted. Control the strength of the magnetic field to 20-60mT; inoculate the enriched microorganisms into the reactor 21 and cultivate them at 25-30°C; after the iron-carbon carrier is attached to the biofilm, perform iron-carbon micro-electrolysis autotrophic denitrification to obtain nitrate nitrogen removal effluent; The hydraulic retention time (HRT) is 6h; among them, the influent containing nitrate nitrogen to be treated is the secondary effluent of the municipal sewage treatment plant, NO 3 - -The concentration of N is 20~30mg / L, no organic carbon source is added, and NO is removed from the effluent of nitrate nitrogen 3 - -N and TN removal rates are over 80% and 70% respectively, meetin...

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Abstract

The invention provides a method and a device for removing nitrate nitrogen pollutants by intensifying iron-carbon micro-electrolysis through a low-intensity magnetic field, and belongs to the technical field of denitrification. Under the action of a low-intensity magnetic field, microorganisms are inoculated on an iron-carbon carrier, nitrate-nitrogen-containing inlet water is introduced, iron-carbon micro-electrolysis corrosion hydrogen evolution and iron-carbon micro-electrolysis autotrophic denitrification are carried out, and nitrate-nitrogen-removed outlet water is obtained. Iron-carbon micro-electrolysis autotrophic denitrification is carried out under the condition of a low-intensity magnetic field, the activity of microorganisms and related enzymes can be improved, the corrosion potential of an iron-carbon carrier can be reduced, the iron-carbon micro-electrolysis corrosion hydrogen evolution rate is increased, the precipitation position and the precipitate attribute can be changed through the Lorentz force and the magnetic field gradient force effect, therefore, the formation of an iron-carbon carrier passivation film is relieved, and the nitrate nitrogen removal effect of microorganisms is effectively improved.

Description

technical field [0001] The invention relates to the technical field of denitrification, in particular to a method and device for removing nitrate nitrogen pollutants through weak magnetic field enhanced iron-carbon micro-electrolysis. Background technique [0002] Nitrate nitrogen can lead to eutrophication of water bodies and pose a potential threat to human health. Nitrate pollution of groundwater and surface water and nitrate discharge in tail water of sewage treatment plants are water environmental problems that need to be solved urgently. Heterotrophic denitrification is a conventional biological denitrification method, that is, nitrate is reduced to nitrogen by heterotrophic denitrifying bacteria to remove water. However, heterotrophic denitrification requires sufficient organic matter as electron donors for efficient nitrate removal, and due to the low carbon-to-nitrogen ratio (COD / N) of surface water, groundwater, and sewage treatment plant tailwater, additional carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/28C02F3/30C02F3/34C02F1/48
CPCC02F3/005C02F3/342C02F3/305C02F3/2806C02F1/482C02F2209/02
Inventor 邢薇高道清王岩
Owner BEIJING JIAOTONG UNIV
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