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Method for catalytic wet oxidative degradation of small molecular organic acid and ammonia-nitrogen solution

A small molecule organic acid, catalytic wet oxidation technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems that affect the stable and effective operation of the biochemical treatment system, increase the pollution degree of the receiving water body, increase the treatment load, etc. Wide range, fast processing speed, no secondary pollution effect

Inactive Publication Date: 2009-02-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to high concentrations of organic matter in landfill leachate, high concentrations of ammonia nitrogen will also aggravate the pollution of receiving water bodies, and excessively high N / C ratios will cause serious imbalances in nutrient ratios, inhibit microbial activity, and thus affect the stability of biochemical treatment systems Efficient operation, increasing the load of subsequent processing

Method used

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  • Method for catalytic wet oxidative degradation of small molecular organic acid and ammonia-nitrogen solution
  • Method for catalytic wet oxidative degradation of small molecular organic acid and ammonia-nitrogen solution
  • Method for catalytic wet oxidative degradation of small molecular organic acid and ammonia-nitrogen solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Put 0.5g of Mn / Ce catalyst and 500mL of organic acid solution (TOC about 434mg / L) prepared according to Table 1 into the reaction kettle, seal it, set the oxygen partial pressure to 1.0Mpa, stir at 500r / min, heat up to 200°C Take a sample from the liquid inlet and record it as the "0" time sample, and then take a sample every 30 minutes until 120 minutes. A total organic carbon analyzer (model TOC-V) produced by Shimadzu Corporation of Japan was adopted. CPH ) measure the total organic carbon (TOC) of the sample after treatment, and calculate the removal rate of TOC.

[0052] Different ratios of n-butyric acid and n-hexanoic acid catalyzed wet oxidation reached the preset temperature, and the removal rate of TOC at 0 min was shown in figure 2 : The TOC removal rate of mixed acids is lower than that of n-butyric acid or n-hexanoic acid, and the TOC removal rate of n-butyric acid is the lowest when the TOC is 75% and 50%, indicating that there is an interaction between ...

Embodiment 2

[0057] The reaction solution is 500mL of n-butyric acid solution (TOC is about 434mg / L), and five kinds of ammonia nitrogen solutions with different concentrations are added to the reaction solution respectively, so that the concentrations of ammonia nitrogen in the reaction solution are 0, 120, 260 and 400mg / L respectively, corresponding to The pH values ​​of the solutions are 3.33, 6, 8 and 10 respectively, the prepared ammonia solution and 0.5gMn / Ce catalyst are added to the reaction kettle respectively, sealed, the oxygen partial pressure is set to 1.0Mpa, the stirring speed is 500r / min, and the heating After rising to 200°C, take a sample from the liquid inlet and record it as the "0" time sample, and then take a sample every 30 minutes until 120 minutes. The TOC and pH of the samples were measured.

[0058] The catalytic wet oxidation degradation of landfill leachate includes both the degradation of organic matter and the degradation of ammonia nitrogen. During the degra...

Embodiment 3

[0064] The reaction solution is 500 mL of ammonia nitrogen solution (about 512 mg / L of ammonia nitrogen), and five kinds of n-butyric acid solutions with different concentrations are added to the reaction solution respectively, so that the concentration of the n-butyric acid solution in the reaction solution is respectively 0, 110, 215, 320 and 430mg / L, put the prepared solution and 0.5gMn / Ce catalyst into the reaction kettle, seal it, set the oxygen partial pressure to 1.0Mpa, stir the speed to 500r / min, heat up to 200°C and take a sample from the liquid inlet and record it as "0 "Time sample, and then take a sample at intervals of 30 minutes until 120 minutes. Measure the ammonia nitrogen in the sample, and calculate the removal rate of ammonia nitrogen.

[0065] Ammonia nitrogen has a certain effect on the degradation of organic acids, and the presence of organic acids may also affect the degradation of ammonia nitrogen. In order to study the effect of organic acids on the...

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Abstract

The invention discloses a catalyzing wet oxidation and degradation method that can be applied on micro molecule organic acid and ammonia nitrogen, which belongs to the technical field of organic wastewater environmental protection treatment. The main components of leachate such as acetic acid, ethyl acetic acid, n-hexoic acid and ammonia nitrogen solution are chosen as simulative wastewater, and degradation treatment with direction is carried out, that is, under the conditions of high temperature, high pressure, with oxygen and catalyst, catalyzing wet oxidation and degradation are carried out on the micro molecule organic acid and ammonia nitrogen by using a 1L of high-pressure autoclave, the influence on the micro molecule organic degradation process is confirmed when two of the three organic acids coexist with each other, and the mutual effect between the organic acid and ammonia nitrogen solution is determined. The method makes up the deficiencies of the research on single component degradation, and has wide treating scope, fast treating speed, high treating efficiency, lower treating cost, and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment of organic wastewater, and specifically provides a method for catalytic wet oxidation degradation of small molecule organic acids and ammonia nitrogen. technical background [0002] The landfill leachate produced in the process of landfill is a kind of highly harmful high-concentration organic wastewater, which is easy to pollute the surrounding environment and the subsoil of the landfill site. It is recognized as one of the most difficult to treat high-concentration organic wastewater in the world. It mainly comes from precipitation and the moisture contained in the garbage itself. The foundation design of some waste landfills is unreasonable, and landfill leachate can easily seep into the ground, causing groundwater pollution. At present, 70% of groundwater in Poland is polluted by landfill leachate and cannot be used by people. Due to the long duration of landfill le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72
Inventor 李鱼王键刘建林赵文晋汤洁董德明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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