Method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification

An autotrophic denitrification and system device technology, applied in the field of high-efficiency autotrophic denitrification, can solve the problems of excessive sulfate radicals in effluent, danger, and high usage costs, and achieve the effects of reducing carbon dioxide emissions, small footprint, and avoiding consumption.

Inactive Publication Date: 2017-11-28
江苏东材新材料有限责任公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen is a flammable gas, there are certain dangers in the process of storage and transportation, and the use cost is high, which restricts the application of hydrogen autotrophic denitrification
Sulfur used in sulfur autotrophic denitrification is cheap and easy to obtain, and has been widely used in practical engineering. Microorganisms reduce nitrate to nitrogen while low-valence sulfur is oxidized to sulfate. Therefore, in the treatment of medium and high concentrations When nitrate wastewater is used, it is easy to cause the sulfate radical in the effluent to exceed the standard
In addition, the sulfur autotrophic denitrification process continues to produce acid, and additional alkalinity is required to maintain a constant pH value of the reaction system

Method used

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  • Method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification
  • Method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification
  • Method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A system device based on S-Fe synergistic autotrophic denitrification to remove nitrate in water, its structure diagram is as follows figure 1 As shown, it mainly includes: an airtight anaerobic / anoxic reactor 3, a water tank 1 and a liquid seal device 2; an electric mixer 4 and a membrane module 5 are arranged in the airtight anaerobic / anoxic reactor 3; The waste water containing sulfate is pumped into the closed anaerobic / anoxic reactor 3 through the pipeline through the water inlet peristaltic pump 6 for treatment, and then pumped out through the water outlet peristaltic pump 9; a vacuum pressure is provided between the water outlet and the water outlet peristaltic pump 9 Table 7: The gas generated in the closed anaerobic / anoxic reactor 3 is discharged through the liquid seal device 2 through the gas outlet pipe.

[0048] The device also includes a PCL automatic control system 8, and the water inlet and outlet of the device are controlled by the PCL automatic control...

Embodiment 2

[0059] Adopt the system device of embodiment 1 to process nitrate waste water, its process parameter control is as follows: in the reactor that effective volume is 3.2L, add the sulfur that particle diameter is 0.5-20mm and each 150g of iron, treated raw water is configured by potassium nitrate, The concentration of nitrate nitrogen in the water is 30, 50 and 80mg / L, and the hydraulic retention time is set at 20min-1h. The water quality after treatment is shown in Table 1.

[0060] Table 1

[0061]

Embodiment 3

[0063] The system device of Example 1 is used to treat nitrate wastewater, and its process parameters are controlled as follows: add 0.5-20mm sulfur and 150g iron each in a reactor with an effective volume of 3.2L, and the raw water to be treated is configured by potassium nitrate, and the nitrate in the water is The nitrogen concentration is 100, 300 and 500mg / L, and the hydraulic retention time is set at 1.5h-4.0h. The water quality after treatment is shown in Table 2.

[0064] Table 2

[0065]

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Abstract

The invention discloses a method and system device for removing nitrate in water based on S-Fe collaborative autotrophic denitrification. The method comprises the steps of treating wastewater containing sulfate in an anoxic or anaerobic reactor by virtue of sulfur particles, iron particles and denitrifying bacteria, and separating water by virtue of a membrane module. The invention further provides the system device for implementing the method. According to the system device, the autotrophic denitrification of S and the autotrophic denitrification of Fe are collaborated in the reactor, denitrification and separation processes are combined together, activated sludge, S and Fe are fluidized through stirring, and efficient autotrophic denitrification is adequately carried out. According to the method, the autotrophic denitrification of S and the autotrophic denitrification of Fe are collaboratively coupled, and the control of the generation amount of sulfate radicals and the maintenance of the pH value of a reaction system are simultaneously realized. The method is suitable for treating medium-concentration and high-concentration nitrate wastewater, has the advantages of high nitrate removal rate, simplicity in operation, small occupied area, low operation cost and the like and will play an important role in treatment practice of nitrate wastewater.

Description

technical field [0001] The invention relates to a method for removing nitrate nitrogen from water by microbial chemical energy autotrophic denitrification, which belongs to the application field of water treatment technology. More specifically, it involves the use of S and Fe synergistic autotrophic denitrification to reduce NO 3- -N reverts to N 2 , using the membrane to intercept microorganisms to achieve solid-liquid separation and high-efficiency autotrophic denitrification. Background technique [0002] Water resources are an important resource for human beings to survive. However, with the rapid growth of population and rapid economic development in recent years, the problem of nitrate pollution in water has become increasingly serious. Long-term drinking of water polluted by nitrates will lead to methemoglobinemia, and nitrites converted from nitrates to amines have carcinogenic, teratogenic, and mutagenic effects. As the problem of nitrate pollution becomes more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/30C02F3/28
CPCC02F3/34C02F1/444C02F3/2853C02F3/305C02F3/345C02F2101/163C02F2203/004C02F2209/06C02F2209/15C02F2209/19
Inventor 韩勇张丽丽宗跃强霍珊
Owner 江苏东材新材料有限责任公司
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