A method for aerobic simultaneous nitrification and denitrification biofilm treatment of nitrogen-polluted water

A simultaneous nitrification and biofilm technology, applied in the field of aerobic simultaneous nitrification and denitrification biofilm to treat nitrogen-polluted water bodies, can solve the problems of low-carbon source sewage denitrification and other issues

Active Publication Date: 2021-04-20
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The most prominent problem brought by low-carbon sources is the denitrification of low-carbon source sewage

Method used

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  • A method for aerobic simultaneous nitrification and denitrification biofilm treatment of nitrogen-polluted water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An aerobic simultaneous nitrification and denitrification biofilm method to treat nitrogen-polluted water bodies: the simultaneous nitrification and denitrification biofilm is obtained by preparing a biofilm carrier; the biofilm carrier is 70% degradable fiber carrier and 30% modified mussel shell .

[0036] The preparation method of the biofilm carrier is to crush the agricultural waste containing more than 50% insoluble cellulose, immerse it in 1.0mol / L sodium hydroxide solution for 48 hours after passing through a 100-mesh sieve, wash until neutral, and add modified Mussel shell powder, mixed evenly and machined into a fixed shape.

[0037] The dosage of biofilm carrier is 20kg / m 3 , functional bacteria are added to the biofilm carrier, and the bottom of the biological aeration tank is aerated to supply oxygen to it, and the dissolved oxygen content in the water body is 6.0mg / L.

[0038] Use the concentration gradient change method to speed up the domestication of ...

Embodiment 2

[0049] An aerobic simultaneous nitrification and denitrification biofilm method to treat nitrogen-polluted water bodies: the simultaneous nitrification and denitrification biofilm is obtained by preparing a biofilm carrier; the biofilm carrier is 80% degradable fiber carrier and 20% modified mussel shell .

[0050] The preparation method of the biofilm carrier is to crush the agricultural waste containing more than 50% insoluble cellulose, immerse it in 1.0mol / L sodium hydroxide solution for 24 hours after passing through a 100-mesh sieve, wash until neutral, and add modified Mussel shell powder, mixed evenly and machined into a fixed shape.

[0051] The dosage of biofilm carrier is 20kg / m 3 , functional bacteria are added to the biofilm carrier, and the bottom of the biological aeration tank is aerated to supply oxygen to it, and the dissolved oxygen content in the water body is 6.0mg / L.

[0052] Use the concentration gradient change method to speed up the domestication of ...

Embodiment 3

[0063] An aerobic simultaneous nitrification and denitrification biofilm method to treat nitrogen-polluted water bodies: the simultaneous nitrification and denitrification biofilm is obtained by preparing a biofilm carrier; the biofilm carrier is 70% degradable fiber carrier and 30% modified mussel shell .

[0064] The preparation method of the biofilm carrier is to crush the agricultural waste containing more than 50% insoluble cellulose, immerse it in 1.0mol / L sodium hydroxide solution for 24 hours after passing through a 100-mesh sieve, wash until neutral, and add modified Mussel shell powder, mixed evenly and machined into a fixed shape.

[0065] The dosage of biofilm carrier is 20kg / m 3, functional bacteria are added to the biofilm carrier, and the bottom of the biological aeration tank is aerated to supply oxygen to it, and the dissolved oxygen content in the water body is 7.0mg / L.

[0066] Use the concentration gradient change method to speed up the domestication of f...

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Abstract

The invention discloses an aerobic synchronous nitrification and denitrification biofilm method for treating nitrogen-polluted water bodies: the synchronous nitrification and denitrification biofilm is obtained by preparing a biofilm carrier; wherein the biofilm carrier is 70-80% degradable fiber carrier and 20~30% modified mussel shells. The beneficial effects are: based on the property of slow-release carbon source of the solid-phase carrier, the control ability of the carbon source is good, the physical and chemical adsorption capacity is good, the speed of film formation is fast, and the specific surface area of ​​the formed biofilm is large. The formed gel-like biofilm gradually forms a dissolved oxygen gradient from the surface to the interior, the surface is in an aerobic state, the middle is facultative, and the interior is anaerobic, forming a relatively independent aerobic-facultative-anaerobic state. Oxygen unit, that is, countless A2O units are formed in the overall aerobic environment inside the BAF to realize heterotrophic simultaneous nitrification and denitrification.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an aerobic simultaneous nitrification and denitrification biofilm method for treating nitrogen-polluted water bodies. Background technique [0002] Nitrification refers to the process in which ammonia nitrogen is finally converted into nitrate nitrogen through the oxidation of nitrosifying bacteria and nitrifying bacteria in an aerobic environment. The overall reaction formula 1.1 of the nitration reaction is: NH 4 + +1.815O 2 +0.1304CO 2 →0.0261C 5 H 7 O 2 +0.973NO 3 - -N+0.921H 2 O+1.973H + . It can be seen from Equation 1.1 that the nitrification process requires a large amount of dissolved oxygen, but does not need to consume organic matter. The denitrification reaction is divided into assimilation denitrification and dissimilatory denitrification. The former refers to the use of the reduction product of nitrate by microorganisms for cell synthesis, and finally con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F3/10C12N1/20C02F101/16
CPCC02F3/105C02F3/109C02F3/301C02F3/302C02F2101/16C02F2305/06C12N1/20Y02W10/10
Inventor 冯丽娟骆玉琴阳广凤穆军
Owner ZHEJIANG OCEAN UNIV
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