Method for treating wastewater containing ammonia

A treatment method and wastewater technology, applied in the direction of oxidized water/sewage treatment, etc., can solve inappropriate problems, achieve the effects of less harmful gases, easy decomposition, and low concentration of residual oxidants

Active Publication Date: 2016-12-14
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such cases, the treatment using the existing chlorine oxidation method is not suitable

Method used

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  • Method for treating wastewater containing ammonia
  • Method for treating wastewater containing ammonia
  • Method for treating wastewater containing ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0050] [Examples 1 to 6 (treatment with liquid containing sodium hypobromite)]

[0051] As test water, steel mill wastewater of the following water quality was used.

[0052] pH: 8.2

[0053] Ammonium ion concentration: 410mg / L (22.7mmol / L)

[0054] TOC: 21mg / L

[0055] ORP: 236mV

[0056] For a liquid containing sodium hypobromite as a chemical solution, a sodium bromide solution with a concentration of 40 wt% and a sodium hypochlorite solution with a concentration of 12 wt% are mixed to form a ratio of NaBr:NaOCl=1:1 (molar ratio) to generate hypobromide Sodium acid liquid.

[0057] 1000 mL of test water was stored in a glass container, the water temperature was kept at 50°C, and the pH was adjusted to 9.6 with NaOH, then the sodium hypobromite aqueous solution was added. The reaction time was set to 5 minutes.

[0058] Table 1 shows the amount of sodium hypobromite added, the residual chlorine concentration, ORP, ammonium ion concentration, and ammonium ion decomposit...

Embodiment 7～21

[0067] [Examples 7 to 21 (treatment with sodium hypobromite and sodium hypochlorite)]

[0068] As test water, steel mill wastewater of the following water quality was used.

[0069] pH: 8.3

[0070] Ammonium ion concentration: 532mg / L (29.5mmol / L)

[0071] TOC: 22mg / L

[0072] ORP: 90mV

[0073] As the liquid containing sodium hypobromite and sodium hypochlorite, the liquid which produced sodium hypobromite by mixing the sodium bromide solution of 40 wt% concentration and the sodium hypochlorite aqueous solution of 12 wt% concentration by the weight ratio of Table 2 was used.

[0074] 1000 mL of test water was stored in a glass container, and the water temperature was kept at 50° C., and after pH was adjusted to 9.6 with NaOH, an aqueous solution of sodium hypobromite was added. The reaction time was set to 5 minutes.

[0075] Table 2 shows the amount of chemical reagents added (converted to the ratio of NaBr and NaOCl added to the test water), the residual chlorine conce...

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Abstract

Provided is a method for treating ammonia-containing water in which the generation of hazardous gas is prevented even at the time of decomposing high concentrations of ammonia, and that is also suitable for partially decomposing ammonia. This method for treating wastewater containing ammonia involves a step for oxidizing and decomposing ammonia by adding a chemical solution including hypobromous acid and/or hypochlorous acid to wastewater containing ammonia. A solution in which hypobromous acid and/or a hypobromite have/has been produced by mixing a bromide aqueous solution and a hypochlorite aqueous solution is added to wastewater containing ammonia. A sodium bromide aqueous solution and a sodium hypochlorite aqueous solution are mixed and added at an equimolar ratio or such that sodium hypochlorite is excessive.

Description

technical field [0001] The invention relates to a method for treating wastewater containing ammonia, in particular to a method for treating wastewater containing ammonia by using hypobromous acid and / or hypobromite. Background technique [0002] A large amount of wastewater containing ammonia exists in iron and steel factories, oil factories, chemical factories, electroplating factories, fertilizer factories, etc. As the removal method of this ammonia, a biological nitrification denitrification method, a stripping method, a chlorine oxidation method (breakpoint method (Patent Document 1)) and the like are known. [0003] The biological nitrification denitrification method is a method of reducing nitrogen to nitrogen by using nitrifying bacteria. However, since the reaction of this method is a microbial reaction, there are disadvantages such as being unstable against various causes of fluctuation, having a wide installation area, and requiring sludge treatment. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/76
CPCC02F1/76
Inventor 小野贵史田中浩一水野诚
Owner KURITA WATER INDUSTRIES LTD
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