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Anaerobic molysite biological nitrogen removal process

A biological denitrification and iron salt technology, applied in the field of anaerobic iron salt biological denitrification process, to achieve sustainable development and full utilization

Inactive Publication Date: 2013-12-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been applied to the field of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the ferric salt biological denitrification reactor, the enriched culture of denitrifying bacteria was used as the biocatalyst, and the molar ratio of nitrate to ferrous salt concentration was 1:2 in the simulated wastewater to run the ferric salt biological denitrification reactor. The main process conditions controlled are: the concentration of nitrate and ferrous salt is 100 mg N / L and 800 mg Fe / L respectively, the concentration of dissolved oxygen is 0.4 mg / L, the reaction temperature is 32 ℃, and the initial pH value is 7.0 , and the hydraulic retention time is 0.5 d. The process can remove nitrate and ferrous salt at the same time, and the removal rates of nitrate and ferrous salt in the effluent reached 95.97 % and 96.22 %, respectively.

Embodiment 2

[0014] In the ferric salt biological denitrification reactor, the ferric salt biological denitrification reactor is operated with the enriched culture of denitrifying bacteria as the biocatalyst and the simulated wastewater with the molar ratio of nitrate and ferrous salt concentration being 1:5. The main process conditions controlled are: the concentration of nitrate and ferrous salt is 100 mg N / L and 2000 mg Fe / L respectively, the concentration of dissolved oxygen is 0.3 mg / L, the reaction temperature is 30 ℃, and the initial pH value is 7.3 , and the hydraulic retention time is 0.5 d. The process can remove nitrate and ferrous salt at the same time, and the volume removal load of nitrate and ferrous salt in the effluent reaches 0.18 kg N / (m 3 d) and 2.60 kg Fe / (m 3 d).

Embodiment 3

[0016] In the ferric salt biological denitrification reactor, the enriched culture of denitrifying bacteria was used as the biocatalyst, and the molar ratio of nitrate to ferrous salt concentration was 1:2 in the simulated wastewater to run the ferric salt biological denitrification reactor. The main process conditions controlled are: the concentration of nitrate and ferrous salt is 100 mg N / L and 800 mg Fe / L respectively, the concentration of dissolved oxygen is 0.4 mg / L, the reaction temperature is 28 ℃, and the initial pH value is 8.0 , and the hydraulic retention time is 0.5 d. The process can remove nitrate and ferrous salt at the same time, and the removal rate of nitrate and ferrous salt in the effluent reaches 0.17 kg N / (m 3 d) and 1.58 kg Fe / (m 3 d).

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Abstract

The invention discloses an anaerobic molysite biological nitrogen removal process which is characterized in that denitrifying bacterium enrichment culture is taken as a biocatalyst, under the anaerobic condition, nitrate is taken as an electron acceptor, ferrous salt is taken as an electron donor, the nitrate is reduced into N2 in the same reactor, and the ferrous salt is oxygenized into ferric iron, wherein the molar ratio of the nitrate to the ferrous salt is 1.0 to 5.0, the reaction temperature is 20 to 35 DEG C, the pH value is 7.0 to 9.0, and the hydraulic retention time is 0.5 to 2.0 d. The process has the following advantages: 1, ferrous salt is taken as the electron donor, nitrate is taken as the electron acceptor, and waste is treated with waste, so that the purposes of removing nitrate-nitrogen pollutant and utilizing ferrous salt waste can be achieved; 2, no organic matter is required, so that the problem that the carbon source is not enough relatively during waste water biological nitrogen removal can be relieved effectively; 3, ferric iron, which is a ferrous salt oxidation product and has high values, can be reclaimed; 4, the concentrations of nitrate and ferrous salt, which can be treated, can reach 1500 mgN / L and 30000 mgFe / L.

Description

technical field [0001] The invention relates to an anaerobic iron salt biological denitrification process. Background technique [0002] After the implementation of "source control and emission reduction" nationwide, the organic pollution of wastewater has been effectively treated, and nitrogen pollution has become a major environmental problem. According to the "National Environmental Statistical Bulletin", in 2010, the total national wastewater discharge was 61.73 billion tons, the chemical oxygen demand (COD) discharge was 12.381 million tons, and the ammonia nitrogen discharge was 1.203 million tons. According to the Bulletin on the State of the Environment in China, among the 26 key lakes (reservoirs) controlled by the state in 2010, 77% of the water bodies were from Class IV to Class V, and 54% were from mild to severe eutrophication. nitrogen. Nitrogen pollution control has become a major environmental protection issue to be solved urgently in our country. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 郑平张萌王茹厉巍
Owner ZHEJIANG UNIV
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