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Short-cut denitrification process adopting catalytic iron and biological coupling

A technology for catalyzing iron and biology, applied in anaerobic digestion and other directions, can solve problems such as increasing operating costs, and achieve the effect of reducing energy consumption, strong advantages, and saving carbon sources

Active Publication Date: 2015-07-22
相出净流智能科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In order to meet the increasingly stringent urban sewage discharge standards for total nitrogen, the carbon source available for denitrification in sewage has often become a limiting factor, especially for sewage from low-carbon sources in southern cities. The usual measure is to add organic carbon sources to Improve the denitrification rate, so the operating cost is greatly improved

Method used

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  • Short-cut denitrification process adopting catalytic iron and biological coupling
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  • Short-cut denitrification process adopting catalytic iron and biological coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 High C / N Ratio Sewage

[0052] A city sewage BOD 5 / TKN is 5, which theoretically meets the carbon source requirements for biological denitrification and denitrification, but due to the increase in water volume, the reactor operation is overloaded, the residence time of the denitrification section is 0.5 hours, and the residence time of the nitrification section is 6.0 hours. not ideal.

[0053] Implement technique of the present invention: catalytic iron puts denitrification section, bulk density is 100kg / M 3 . When the influent total nitrogen is 30 mg / L, ammonia nitrogen is 20 mg / L, BOD 5 When the pH is 150 mg / L and the pH is 7.0, a catalytic iron short-range denitrification system is formed after domestication. The ORP of the denitrification section is controlled at –80 mV, the ORP of the nitrification section is controlled at 60-100 mV, and the dissolved oxygen is controlled at 0.5-1.0 mg / Between L. After treatment, the effluent total nitrogen is 10 ...

Embodiment 2

[0054] C / N ratio sewage in embodiment 2

[0055] A city sewage BOD 5 The / TKN is 2.5, which theoretically does not meet the carbon source requirements for biological denitrification and denitrification. The residence time of the denitrification section is 2.0 hours, and the residence time of the nitrification section is 8.0 hours. The effect of biological denitrification is not ideal.

[0056] The process of the present invention: the catalytic iron is placed in the denitrification section, and the bulk density is 50kg / M 3 . When the influent total nitrogen is 60 mg / L, ammonia nitrogen is 40 mg / L, BOD 5 When the pH is 150 mg / L and the pH is 7.2, a catalytic iron short-range denitrification system is formed after domestication. The ORP of the denitrification section is controlled at –100 mV, the ORP of the nitrification section is controlled at 60-100 mV, and the dissolved oxygen is controlled at 0.5-1.0 mg / Between L. After treatment, the effluent total nitrogen is 8 mg / L,...

Embodiment 3

[0057] Example 3 Low C / N Ratio Sewage

[0058] A city sewage BOD 5 The / TKN is 1, which is far from meeting the carbon source requirements for biological denitrification and denitrification. Using the short-range denitrification process coupled with catalytic iron and biology of the present invention, the residence time of the denitrification section is designed to be 1.0 hours, and the residence time of the nitrification section is 7.0 hours. The catalytic iron device is placed in the denitrification section, and the bulk density is 100kg / M 3 , the first 1 / 7 of the nitrification section (residence time 1 hour) is also equipped with a catalytic iron device, and the bulk density is 200kg / M 3 . When the influent total nitrogen is 60 mg / L, ammonia nitrogen is 30 mg / L, BOD 5 When the pH is 60 mg / L and the pH is 7.2, the catalytic iron short-range denitrification system is formed after domestication, the ORP of the denitrification section is controlled at -120 mV, the ORP of the...

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Abstract

The invention relates to a short-cut denitrification process adopting catalytic iron and biological coupling. The denitrification process comprises a catalytic iron biological denitrification section and a biological nitrosation section. In the catalytic iron biological denitrification section, wastewater enters the catalytic iron biological denitrification section, and the hydraulic retention time is controlled to be 20 minutes to 2 hours; the reflux ratio of mixed liquor is 100-300%; catalytic iron stuffing is arranged internally and the stacking density is 50-200 kg / M<3>. In the biological nitrosation section, when the number of structural-state ferrous iron Fe (II) formed by catalytic iron in the denitrification section is sufficient, the oxidation reduction potential (OPR) in the nitrosation section is controlled to be 40-100 mV; the hydraulic retention time in the nitrosation section is controlled to be 6-10 hours; when the number of structural-state ferrous iron Fe (II) formed by catalytic iron in the denitrification section is insufficient for producing a nitrite reduction reaction, the catalytic iron stuffing can be put at the front end of the nitrosation section at the same time, the generation of structural-state ferrous iron Fe (II) is accelerated by dissolved oxygen in the nitrosation section, a catalytic iron stuffing arrangement region is positioned at the front section of the biological nitrosation section, the hydraulic retention time is 1.0 hour, and the stacking density is 50-200 kg / M<3>. The short-cut denitrification process greatly reduces organic carbon sources required by denitrification and greatly shortens nitrification and denitrification processes.

Description

technical field [0001] The invention relates to the field of water pollution control engineering, in particular to a short-range denitrification process coupled with catalytic iron and biology. Iron reduces nitrite, thus forming a short-range denitrification process coupled with physicochemical and biochemical. Background technique [0002] With the development of society and the improvement of people's living standards, the eutrophication of water bodies has attracted more and more attention. The total nitrogen index in the discharge standards of sewage treatment plants has become more stringent. Nitrogen removal has become the main task of upgrading urban sewage treatment plants. [0003] Urban sewage treatment plants all adopt biological denitrification methods, which are divided into two types of biochemical reaction processes: nitrification and denitrification. The whole process can be expressed by the following equation: [0004] Nitrosation reaction: [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 马鲁铭吴德礼马捷汀王梦月
Owner 相出净流智能科技(上海)有限公司
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