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Spectrophotometric method for measuring hydroxylamine nitrogen concentration of biological sewage treatment system

A technology for biological sewage treatment and spectrophotometry, which is applied in the fields of environmental engineering and analytical chemistry, can solve the problems of high test cost, difficulty in popularizing existing methods, and difficult measurement, and achieves simple operation, high measurement accuracy, and linear range. wide effect

Inactive Publication Date: 2018-03-09
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NH in sewage treatment system 2 The determination of OH is difficult, the test cost is high, and the existing methods are difficult to popularize

Method used

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  • Spectrophotometric method for measuring hydroxylamine nitrogen concentration of biological sewage treatment system
  • Spectrophotometric method for measuring hydroxylamine nitrogen concentration of biological sewage treatment system
  • Spectrophotometric method for measuring hydroxylamine nitrogen concentration of biological sewage treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Select the NH in the sample 2 OH-N is less than 0.1mg / L, study different PO 4 3- -P concentration and NO 2 - NH at -N concentration, ferric ammonium sulfate-1,10 phenanthroline spectrophotometry 2 OH-N concentration measurement results, and the above numerical methods were used to correct the measurement results. The results are shown in Table 8.

[0101] Table 8 NH of ferric ammonium sulfate-1,10 phenanthroline spectrophotometry before and after numerical method correction 2 OH-N measurement results

[0102]

[0103]

[0104] When the sample contains NH 2 OH-N and PO 4 3- -P, the NH measured by the above numerical method on ferric ammonium sulfate-1,10 phenanthroline spectrophotometry 2 OH-N concentration was corrected, and the recovery was significantly improved. When sample NH 2 OH-N concentration is 0.06mg / L, PO 4 3- - When the P concentration changes within the range of 1.40mg / L to 3.80mg / L, the NH measured by ferric ammonium sulfate-1,10phenant...

Embodiment 2

[0108] Adopt the method that the present invention proposes to measure NH in the short-range nitrification SBR reactor of laboratory scale 2 The concentration change of OH-N, the measurement result see Figure 13 and Figure 14 .

[0109] The SBR reactor is made of plexiglass, cylindrical in shape, 400mm high, 200mm in diameter, and has a total effective volume of 10L. The reactor is equipped with a rectangular stirring paddle for stirring. The water inlet is set at the top of the reactor, and the water outlet is set at 200mm from the bottom. An aeration sand tray is arranged at the bottom, and air is supplied into the reactor through the air compressor through the aeration sand tray, and the air flow rate is controlled by a flow meter. The DO concentration in the reactor was kept in the range of 0.4mg / L~0.5mg / L. The temperature of the SBR reactor is controlled by a water bath device, and the reaction temperature is controlled at 30°C±2°C. The sludge concentration of the...

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Abstract

The invention discloses a spectrophotometric method for measuring hydroxylamine nitrogen concentration of a biological sewage treatment system. According to the method, hydroxylamine is stabilized under acidic conditions, ammonium ferric sulfate serves as an oxidizing agent, 1,10-phenanthroline serves as a color developing agent, Fe<3+> is reduced into Fe<2+> by the hydroxylamine, and NH2OH-N concentration of the sample is indirectly determined by measuring the absorbance of the generated Fe<2+> and a complex formed by the 1,10-phenanthroline at a 510nm wavelength. The method has the advantages of wide linear range, simple measuring process, high NH2OH-N measuring recovery rate and less relative standard deviation, can meet the detection requirements of the NH2OH-N concentration in the biological sewage treatment process, and is applicable to quantitative analysis of the NH2OH-N content of a water sample.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and analytical chemistry, and relates to a spectrophotometric method for measuring hydroxylamine nitrogen (NH 2 OH-N), specifically relates to a spectrophotometric method for measuring the concentration of hydroxylamine nitrogen in sewage biological treatment systems. Background technique [0002] Hydroxylamine (NH 2 OH) as an intermediate product in the nitrification process, produced from ammonia nitrogen (NH 4 + -N) to nitrite nitrogen (NO 2 - -N) conversion process. NH 2 OH has high reactivity and is easy to react with various substances in the environment, directly measuring NH in water 2 OH concentration is more difficult. Currently, NH 2 The determination of OH mainly relies on indirect methods, including titration, electrochemical methods, spectroscopy, gas chromatography, etc. Indirect method using NH 2 OH has the characteristics of high reactivity, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 胡博赵剑强刘珺吴沛田晓雷叶峻宏
Owner CHANGAN UNIV
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