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Process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate

A technology of ion exchange and ammonium nitrate, which is applied in the field of ion exchange treatment of nitrogen-containing wastewater and recovery of ammonium nitrate, can solve the problems of low low-temperature nitrification efficiency, complex operation management, secondary pollution, etc., and achieve low treatment efficiency, flexible operation management, Realize the effect of reuse

Inactive Publication Date: 2010-11-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Denitrification refers to the reduction of NO by the action of denitrifying bacteria under anoxic conditions. 3 - and NO 2 - Revert to N 2 The electron donors of this process are various carbon sources, and the carbon-containing organic matter in nitrogen fertilizer plant wastewater is very little, so the biological denitrification process needs to supplement enough carbon sources, which is very expensive
At the same time, the low-temperature nitrification efficiency is very low, the operation and management are complicated, and the residual sludge of biological denitrification produces secondary pollution

Method used

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  • Process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate

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Experimental program
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Effect test

Embodiment approach 1

[0025] Ion exchange resin adopts strongly acidic cation exchange resin D001 and weakly basic anion exchange resin D370.

[0026] Strongly acidic cation exchanger: run at a water temperature of 15°C, the pH value of the influent water is 6; the exchange flow rate is 4m / h, the concentration of the nitric acid regeneration solution is 10%, the regeneration flow rate is 4m / h, and the forward and backwash flow rates are 15m / h. The time for forward and backwashing is 20 minutes;

[0027] Weakly alkaline anion exchanger: run at a water temperature of 15°C, the pH value of the feed water is 6; the exchange flow rate is 4m / h, the concentration of the ammonia water regeneration solution is 5%, the regeneration flow rate is 4m / h, and the forward and backwash flow rates are 15m / h , The positive and negative washing time is 20 minutes.

Embodiment approach 2

[0029] The ion exchange resin adopts strongly acidic cation exchange resin D001 and weakly basic anion exchange resin D370.

[0030]Strongly acidic cation exchanger: run at a water temperature of 15°C, the pH value of the influent water is 7; the exchange flow rate is 4m / h, the concentration of the nitric acid regeneration solution is 20%, the regeneration flow rate is 4m / h, and the forward and backwash flow rates are 15m / h. The time for forward and backwashing is 20 minutes;

[0031] Weakly alkaline anion exchanger: run at a water temperature of 15°C, the pH value of the influent is 7; the exchange flow rate is 4m / h, the concentration of the ammonia water regeneration solution is 15%, the regeneration flow rate is 4m / h, and the forward and backwash flow rates are 15m / h , The positive and negative washing time is 20 minutes.

Embodiment approach 3

[0033] Ion exchange resin adopts strongly acidic cation exchange resin D001 and weakly basic anion exchange resin D370.

[0034] Strongly acidic cation exchanger: run at a water temperature of 15°C, the pH value of the influent water is 8; the exchange flow rate is 6m / h, the concentration of the nitric acid regeneration solution is 30%, the regeneration flow rate is 5m / h, and the forward and backwash flow rates are 15m / h. The time for forward and backwashing is 20 minutes;

[0035] Weakly alkaline anion exchanger: run at a water temperature of 15°C, the pH value of the influent water is 8; the exchange flow rate is 6m / h, the concentration of the ammonia water regeneration solution is 20%, the regeneration flow rate is 5m / h, and the forward and backwash flow rates are 15m / h , The positive and negative washing time is 20 minutes.

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Abstract

The invention discloses a process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate, and belongs to the technical field of environmental protection and wastewater treatment. The process is characterized in that: a strong acid cation exchanger and a weak alkali anion exchanger are connected in series to realize denitrification of the nitrogen-containing wastewater of a nitrogen fertilizer plant; the process is used for treating the high-concentration ammonia nitrogen and median-concentration nitrate nitrogen containing wastewater of the nitrogen fertilizer plant; strong acid cation exchange resin and weak alkali anion exchange resin are regenerated by adopting nitric acid and aqueous ammonia respectively; and the regenerated waste liquid ammonium nitrate is evaporated and concentrated to reclaim the ammonium nitrate. Compared with the traditional wastewater denitrification method, the process can remove ammonia nitrogen and nitrate nitrogen from the wastewater at the same time, reclaim the ammonium nitrate and recycle production water, does not produce secondary pollution, reclaims products from the pollutants, has obvious environmental benefit and economic benefit, and is a new path for treating the high-concentration ammonia nitrogen and median-concentration nitrate nitrogen containing wastewater of the nitrogen fertilizer plant.

Description

technical field [0001] The invention discloses a process for treating nitrogen-containing wastewater by ion exchange and recovering ammonium nitrate, which belongs to the technical field of environmental protection and wastewater treatment. Specifically, a strong acidic cation exchanger and a weakly basic anion exchanger are used in series to realize the treatment of nitrogenous wastewater from a nitrogen fertilizer plant, and a strong acidic cation exchanger and a weakly basic anion exchanger are used to complete the treatment of nitrogenous wastewater For the removal of ammonia nitrogen and nitrate nitrogen, the strongly acidic cation exchange resin and weakly basic anion exchange resin after exchange treatment are regenerated with nitric acid and ammonia water respectively, and the regeneration waste liquid is ammonium nitrate solution, which can be recovered after concentration. Background technique [0002] Nitrogen fertilizer plant wastewater comes from condensate, was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01C1/18C02F1/42
Inventor 李亚新李红艳岳秀萍李尚明
Owner TAIYUAN UNIV OF TECH
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