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Method for improving nitrite accumulation in short-cut denitrification process

A short-range denitrification and nitrite technology, applied in the field of improving nitrite accumulation in the short-range denitrification process, can solve the problems of difficult management, instability, and restricting the application of short-range denitrification-anammox denitrification, etc. Simple operation, stable cumulative effect

Active Publication Date: 2021-10-19
DONGGUAN UNIV OF TECH
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Problems solved by technology

However, the enrichment efficiency of Thauera is usually low and unstable, and it is difficult to achieve short-term denitrification quickly, easily and efficiently, which limits the application of short-term denitrification-ANAMMOX denitrification
There are also external conditions such as reactor sludge concentration, carbon source, C / N ratio, and pH to achieve nitrite accumulation in denitrification. However, it is difficult to manage by controlling changes in multiple external conditions to indicate the reaction process. Low efficiency and other problems, and the accumulation efficiency is often unstable, which greatly restricts the promotion of the application of anaerobic ammonia oxidation

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  • Method for improving nitrite accumulation in short-cut denitrification process
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  • Method for improving nitrite accumulation in short-cut denitrification process

Examples

Experimental program
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Effect test

Embodiment 1

[0054] In this example, the effect of the oxidant potassium persulfate (PDS) on the accumulation efficiency of nitrite nitrogen in the denitrification reaction system was mainly studied.

[0055] 1. Effect of oxidant potassium persulfate (PDS) on nitrite bioreduction

[0056] 1), Kinetics of persulfate chemical oxidation of nitrite: Add potassium persulfate and 100mg / L NO at a final concentration of 1.2mM to 100mL phosphate buffer solution (pH7.5) 2 - -N, charge N 2 Remove the oxygen in the anaerobic bottle for 2 minutes, place it in an air bath shaker, and react at 30°C and 180rpm, collect samples with different reaction times, and measure the NO in the sample 2 - -N, NO 3 - -N and SO 4 2- Concentration of concentration, the results see figure 1 (a).

[0057] 2), persulfate inhibits kinetics of nitrite bioreduction: simulate anaerobic reactor with anaerobic reaction bottle, pour into 100mL mud-water mixture (equivalent to reaction mixture in step S2, sludge concentr...

Embodiment 2

[0074] This example mainly studies the influence of different concentrations of persulfate on denitrification reaction.

[0075] A method for improving the accumulation of nitrite in a short-range denitrification process, comprising the steps of:

[0076] S1. Inoculate the denitrification activated sludge into the anaerobic reactor to make the sludge concentration 1000mg / L, then add the oxidant-potassium persulfate, the concentration of potassium persulfate is 0, 0.05, 0.1, 0.7, 1.2, 1.5 , 2, 2.5, 4.5, 7.5, 10.5mM to study the effect of different concentrations of persulfate on denitrification reaction;

[0077] S2. Inlet water into the anaerobic reactor to form a reaction mixture, and control the initial NO of the reaction mixture 3 - -N is 100mg / L, glucose is added as a carbon source to adjust the C / N ratio to 2, and then the temperature is 30±5°C, the rotation speed is 180rpm, the pH is 7.5±0.5, and the hydraulic retention time (HRT) is 48h. Start the anaerobic reactor f...

Embodiment 3

[0081] This example mainly studies the influence of different C / N ratios on the denitrification reaction.

[0082] Embodiment 3 is basically the same as Embodiment 2, and its difference is: in step S1, potassium persulfate concentration is 1.2mM; In step S2, add glucose as carbon source adjustment C / N ratio is respectively 0.7,1,2,3 and 4, that is, the concentration of glucose is 70, 100, 200, 300, 400mg / L respectively. The experimental results are shown in Table 1.

[0083] Table 1 Effect of different C / N ratios on denitrification reaction

[0084]

[0085] It can be seen from Table 1 that the concentration of nitrate nitrogen continued to decrease with the increase of C / N ratio, and the concentration of nitrite nitrogen continued to increase with the increase of C / N ratio, but the accumulation rate of nitrite nitrogen continued to increase with the increase of C / N ratio. This is because the C / N ratio will affect the removal of total nitrogen. When the carbon source incr...

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Abstract

The invention provides a method for improving nitrite accumulation in a short-cut denitrification process, and belongs to the technical field of wastewater treatment. The method comprises the following steps: S1, inoculating denitrification activated sludge into an anaerobic reactor, and adding 0.05-15 mmol of an oxidizing agent into each gram of denitrification activated sludge; and S2, feeding water into the anaerobic reactor to form a reaction mixed solution, and starting the anaerobic reactor to carry out denitrification reaction. According to the invention, by adding the specific oxidant, the reduction of nitrate is selectively promoted, and the further reduction of nitrite can be inhibited, so that the accumulation of nitrite is accelerated by increasing the generation amount of nitrite and reducing the consumption amount of nitrite, and the short-time, efficient and stable accumulation of nitrite is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for improving nitrite accumulation in a short-range denitrification process. Background technique [0002] With the rapid economic development and the continuous improvement of living standards, the discharge of urban sewage is increasing day by day, nitrogen compounds are excessively discharged into the water body, causing the excessive reproduction of algae and other microorganisms, resulting in eutrophication of the water body, and eutrophication has already It has become a common phenomenon in my country's water bodies and has a further development trend. The eutrophication of water body seriously destroys water ecology and endangers human health. Therefore, the removal of nitrogen pollution in water has become a hot issue in the field of water pollution prevention and control. [0003] At present, biological denitrification is the most economical, effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/28C02F3/30C02F101/30
CPCC02F3/348C02F3/28C02F3/307C02F2305/06C02F2209/10C02F2209/06C02F2209/44C02F2209/08C02F2101/30C02F3/282C02F3/2846C02F3/2833Y02W10/10
Inventor 潘建新魏任苏美蓉刘亮亮
Owner DONGGUAN UNIV OF TECH
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