Aerobic synchronous nitrification and denitrification biofilm process for treating nitrogen-polluted water

A simultaneous nitrification and biofilm technology, applied in the field of aerobic synchronous nitrification and denitrification biofilm treatment of nitrogen-polluted water bodies, can solve the problems of low-carbon source sewage denitrification, etc., to shorten the hydraulic retention time, shorten the start-up time, The effect of increasing the denitrification rate

Active Publication Date: 2018-06-12
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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  • Aerobic synchronous nitrification and denitrification biofilm process for treating nitrogen-polluted water

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Effect test

Embodiment 1

[0036] 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 .

[0037] 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.

[0038] 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.

[0039] Use the concentration gradient change method to speed up the domestication of ...

Embodiment 2

[0050] 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 .

[0051] 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.

[0052] 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.

[0053] Use the concentration gradient change method to speed up the domestication of ...

Embodiment 3

[0064] 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 .

[0065] 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.

[0066] 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.

[0067] 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 process for treating nitrogen-polluted water. A biofilm carrier is prepared and cultured to obtain a synchronous nitrification and denitrification biofilm, wherein the biofilm carrier is prepared from 70-80% of a degradable fiber carrier and 20-30% of a modified mussel shell. The biofilm process disclosed by the invention has the beneficial effects that based on the property of a solid phase carrier for slow release of a carbon source, the control capability to the carbon source is good, physical and chemical adsorption capabilities are good, the biofilm formation speed is highfast, and the formed biofilm has a large specific surface area. According to the Tthe formed gelatinous biofilm, is characterized in that a dissolved oxygen gradient is gradually formed from the surface to the inside, the surface of the gelatinous biofilm is in an aerobic state, the middle part is facultative, the inside isin an anaerobic state, and thus a relatively independent aerobic-facultative-anaerobic unit is formed, namely that a plurality of A2O units are further formed in the overall aerobic environment insidethe BAF, and heterotrophic synchronous nitrification and denitrification can be realized.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an aerobic synchronous nitrification and denitrification biofilm method for treating nitrogen-polluted water bodies. Background technique [0002] Nitrification refers to the process in which ammonia nitrogen is oxidized by nitrosifying bacteria and nitrifying bacteria in an aerobic environment, and finally converted into nitrate nitrogen. 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 formula 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 assimilative denitrification and dissimilatory denitrification. The former refers to the use of nitrate reduction products by microorganisms for cell synthesis, and finally converts nitrate in...

Claims

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Application Information

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Patent Type & Authority Applications(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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