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Method for removing nitrate nitrogen in water through ion exchange and denitrification integration

A technology of ion exchange and nitrate nitrogen, which is applied in the integrated field of nitrate nitrogen removal, can solve the problems of difficult treatment and low nitrate removal rate, reduce operating costs, remove quickly and efficiently, and avoid high-salt desorption liquid Effect

Active Publication Date: 2015-11-11
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the anion exchange resin needs to be regenerated with a large amount of high-concentration salt or alkali, and the resulting desorption solution contains a large amount of target pollutants, salt or alkali, which is difficult to be treated by biological methods
Therefore, the problem of desorption liquid treatment and disposal has always been the bottleneck of the practical application of ion exchange water treatment.
This patent aims at the defect that the nitrate removal rate is too low in "zero-valent iron autotrophic denitrification", and uses the addition of ion-exchange resin for rapid treatment, and a large number of OH- ions generated in zero-valent iron corrosion are also harmful to the ion-exchange resin. It has a regeneration effect, but the regenerated nitrate still needs to be converted into nitrogen through the zero-valent iron autotrophic denitrification process, so in essence, the treatment process is subject to a key step in long-term use-zero-valent iron autotrophic denitrification reaction control

Method used

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  • Method for removing nitrate nitrogen in water through ion exchange and denitrification integration

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Effect test

Embodiment 1

[0042] A method for integrated removal of nitrate nitrogen in water by ion exchange and denitrification, comprising the following steps:

[0043] (1) Pass the waste water containing nitrate nitrogen through the anion exchange resin ( A520E) adsorption tower, the basic structural unit of the anion exchange resin is as follows:

[0044]

[0045] (2) When the concentration of nitrate nitrogen in the effluent of the adsorption tower is 5% of the concentration of nitrate nitrogen in the unadsorbed initial liquid, put the resin of 30% v / v in the adsorption tower into the reactor for regeneration, and add 1 times The resin volume mineral element solution (the mineral element solution is composed of 0.5wt% sodium chloride aqueous solution), the temperature is raised to 33°C at 0.5±0.4°C / min, and the temperature is kept at 33±3°C;

[0046] (3) adding in the system that step (2) obtains is the aerobic sludge of urban sewage treatment plant that is 1:1000 with the mass ratio of mine...

Embodiment 2

[0054] A method for integrated removal of nitrate nitrogen in water by ion exchange and denitrification, comprising the following steps:

[0055] (1) The waste water containing nitrate nitrogen is passed through an adsorption tower equipped with anion-exchange resin (anion-exchange resin D201 produced in China, Jiangsu Jinkai Resin Chemical Co., Ltd.), and the basic structural unit of this anion-exchange resin is as follows:

[0056]

[0057] (2) When the concentration of nitrate nitrogen in the effluent of the adsorption tower is 10% of the concentration of nitrate nitrogen in the unadsorbed initial liquid, put 50% v / v resin in the adsorption tower into the reaction kettle for regeneration, and add 2 times The resin volume mineral element solution (the mineral element solution is composed of 1wt% potassium chloride aqueous solution), the temperature is raised to 35°C at 1±0.5°C / min, and the temperature is kept at 35±2°C;

[0058] (3) in the system that step (2) obtains, ad...

Embodiment 3

[0066] A method for integrated removal of nitrate nitrogen in water by ion exchange and denitrification, comprising the following steps:

[0067] (1) The waste water containing nitrate nitrogen is passed through an adsorption tower equipped with anion-exchange resin D205 (Jiangsu Jinkai Resin Chemical Co., Ltd.), and the basic structural unit of this anion-exchange resin is as follows:

[0068]

[0069] (2) When the concentration of nitrate nitrogen in the effluent of the adsorption tower is 30% of the concentration of nitrate nitrogen in the unadsorbed initial liquid, the resin of 100% v / v in the adsorption tower is injected into the reactor for regeneration, and 3 times of Mineral element solution of resin volume (mineral element solution is composed of 2.5wt% potassium chloride aqueous solution), the temperature is raised to 35°C at 2±1°C / min, and the temperature is kept at 35°C;

[0070](3) in the system that step (2) obtains, add the biofilm that is loaded on the granu...

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Abstract

The invention discloses a method for removing nitrate nitrogen in water through ion exchange and denitrification integration to solve the problem that nitrate nitrogen pollution exists in water or waste water at present. The method includes the steps that enrichment of the nitrate nitrogen in the water or waste water is achieved through high-selectivity nitrate ion exchange resin; the ion exchange resin enriched with the nitrate nitrogen is regenerated and recycled under certain conditions directly through the action of biological denitrification; finally, the nitrate nitrogen in the water or the waste water can be effectively removed through the continuous technology. The method can be used for removing nitrate nitrogen in underground water, surface water, municipal sewage, industrial waste water and various kinds of water, and is particularly applicable to natural water body, sewage bio-chemical effluents and water bodies with few carbon sources capable of being used by organisms.

Description

technical field [0001] The present invention relates to a method for removing nitrate nitrogen in water by integrating ion exchange and denitrification, more specifically, a method for efficiently enriching nitrate nitrogen through ion exchange resin, and then carrying out decontamination on the ion exchange resin enriched with nitrate nitrogen. Denitrification treatment is an integrated method for recycling and removing nitrate nitrogen. Background technique [0002] Nitrate nitrogen widely exists in various water bodies in nature. In recent years, with the rapid development of my country's industry and agriculture and the frequent production and living activities of human beings, nitrate nitrogen from industrial wastewater, rural and urban sewage sources has been continuously discharged into nature, and the concentration of nitrate nitrogen in water has also increased sharply. Both surface water and groundwater have been seriously polluted by nitrate nitrogen, and its exi...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16
Inventor 双陈冬罗堃李爱民梁英刘福强周伟伟宋海鸥
Owner NANJING UNIV
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