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Method for recovering ammonia nitrogen in wastewater

A technology for wastewater and ammonia nitrogen, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high cost of chemicals and reduced removal rate of ammonia nitrogen, and achieves reduction of cost of chemicals, high recovery efficiency, and simple operation. Effect

Inactive Publication Date: 2015-08-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0005] Aiming at the problems of high cost and low efficiency of recycling ammonia nitrogen in waste water by ammonium magnesium phosphate crystallization method in the prior art, the present invention provides an economical method for recycling ammonia nitrogen in waste water, which can effectively solve the problem of ammonium magnesium phosphate crystallization method At the same time, it solves the problem that the removal rate of ammonia nitrogen decreases with the increase of the number of ammonium ammonium phosphate cycles in the pyrolysis recovery of magnesium ammonium phosphate.

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  • Method for recovering ammonia nitrogen in wastewater
  • Method for recovering ammonia nitrogen in wastewater
  • Method for recovering ammonia nitrogen in wastewater

Examples

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Embodiment 1

[0022] The method for recovering ammonia nitrogen in coal gasification wastewater described in the present embodiment specifically comprises the following steps:

[0023] (1) Put the magnesium ammonium phosphate crystals recovered in the wastewater treatment into the acid solution for acid hydrolysis, acidolysis at 10°C for 3 hours, and prepare a magnesium ammonium phosphate solution with a mass fraction of 20%; inject the magnesium ammonium phosphate solution into In the anode chamber, keep the current density at 20ma / cm 2 Under the conditions of separation for 3 hours, the separated anode chamber and cathode chamber products were obtained.

[0024] (2) Add the anode chamber and cathode chamber products obtained in step (1) to the wastewater, so that mg 2+ : Ammonia nitrogen in wastewater: po 4 3- The molar ratio is 1.4:1:0.6, the anode and cathode products form ammonium magnesium phosphate crystals with the ammonia nitrogen in the wastewater, precipitate and separate from...

Embodiment 2

[0029] The method for reclaiming ammonia nitrogen in the coking wastewater described in the present embodiment specifically comprises the following steps:

[0030] (1) Put the magnesium ammonium phosphate crystals recovered in wastewater treatment into the acid solution for acid hydrolysis, acidolysis at 60°C for 1 hour, and prepare a magnesium ammonium phosphate solution with a mass fraction of 30%. Inject the magnesium ammonium phosphate solution into the anode chamber and keep the current density at 10ma / cm 2 Under the conditions of separation for 2 hours, the separated anode chamber and cathode chamber products were obtained.

[0031] (2) Add the anode chamber and cathode chamber products obtained in step (1) to the wastewater, so that mg 2+ : Ammonia nitrogen in wastewater: po 4 3- The molar ratio is 0.9:1:1.3, the anode and cathode products form ammonium magnesium phosphate crystals with the ammonia nitrogen in the wastewater, precipitate and separate from the wastewa...

Embodiment 3

[0035] A kind of method of the recovery of ammonia nitrogen in the economical vanadium waste water of the present embodiment, its steps are:

[0036] (1) Dissolve the magnesium ammonium phosphate crystals recovered in wastewater treatment in an acid solution, acidolyze at 30°C for 1 hour, and prepare a magnesium ammonium phosphate solution with a mass fraction of 50%. Inject the magnesium ammonium phosphate solution into the separation pole chamber and keep the current density at 40ma / cm 2 Under the conditions of separation for 2 hours, the separated anode chamber and cathode chamber products were obtained.

[0037] (2) Add the anolyte and cathodic precipitation obtained in step (1) to the wastewater, so that mg 2+ : Ammonia nitrogen in wastewater: po 4 3- The molar ratio is 1.2:1:1.1, the anode and cathode products form ammonium magnesium phosphate crystals with the ammonia nitrogen in the wastewater, precipitate and separate from the wastewater.

[0038] (3) Recover the ...

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Abstract

The present invention discloses a method for recovering ammonia nitrogen in wastewater, and belongs to the field of wastewater treatment. The steps comprise: dissolving the recovered magnesium ammonium phosphate solid in an acid solution to obtain a magnesium ammonium phosphate solution with a certain mass fraction; injecting the obtained magnesium ammonium phosphate solution into the separation pole chambers of an electrodialysis system to carry out anion and cation separation, and treating according to a certain operating parameters; after completing the treating, pouring the products of the anode chamber and the cation chamber to wastewater according to a certain ratio to obtain magnesium ammonium phosphate crystal precipitate so as to achieve the purpose of removal of ammonia from the wastewater; and recovering the magnesium ammonium phosphate crystal, dissolving in an acid solution to prepare the magnesium ammonium phosphate solution with a certain mass fraction, injecting into the pole chambers to carry out the separation treatment, and pouring the products of the anode chamber and the cation chamber to the wastewater to circularly remove the ammonia after completing the treating. With the method of the present invention, the problem of the high agent cost of the magnesium ammonium phosphate method can be effectively solved, and the difficult problem that the ammonia nitrogen removal rate is reduced along with the increase of the number of the magnesium ammonium phosphate circulation ammonia removal is solved.

Description

technical field [0001] The invention relates to a method for recovering ammonia nitrogen in waste water, more specifically, an economical method for circulating ammonia nitrogen waste water, which can efficiently remove ammonia nitrogen in waste water, and belongs to the field of waste water treatment. Background technique [0002] In recent years, the magnesium ammonium phosphate crystallization ammonia precipitation method has been extensively studied. Magnesium ammonium phosphate crystallization method is to remove ammonia nitrogen by adding soluble magnesium salt and phosphate to ammonia nitrogen in wastewater to form magnesium ammonium phosphate crystals. This method can solve the problem of poor biochemical denitrification effect of biochemical inhibition wastewater such as coal chemical industry wastewater, and magnesium ammonium phosphate is a good slow-release fertilizer. While removing ammonia nitrogen from wastewater, the precipitated product can also be used as a...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/16
Inventor 胡学伟靳松望夏丽娟王亚冰张雅琳
Owner KUNMING UNIV OF SCI & TECH
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