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Biological denitrification method coupled with iron flocculation process

A technology of biological denitrification and flocculation process, applied in the field of biological denitrification, can solve the problems of limiting the abundance and activity of Feammox functional bacteria and denitrification efficiency, restricting the large-scale application of Feammox process, and poor bioavailability, so as to achieve easy transformation and upgrading , good universality and operability, no need for carbon source effect

Active Publication Date: 2022-07-29
PEKING UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

Although Fe is abundant in the natural environment, Fe(III) usually exists in the form of insoluble or insoluble iron oxides under neutral conditions, and its bioavailability is poor, which greatly limits the abundance of Feammox functional bacteria. Activity and denitrification efficiency
To achieve Feammox on NH 4 + The continuous oxidation of Feammox requires continuous addition of bioavailable Fe(III) to the reaction system, which is unrealistic in practical applications, thus restricting the large-scale application of the Feammox process

Method used

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  • Biological denitrification method coupled with iron flocculation process
  • Biological denitrification method coupled with iron flocculation process
  • Biological denitrification method coupled with iron flocculation process

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Embodiment 1

[0043] The present embodiment has carried out a deep denitrification treatment for urban sewage, as follows:

[0044] Take the secondary biological treatment effluent of a city sewage plant for test, its total phosphorus content is 3.12mg / L, ammonia nitrogen is 2.53mg / L, nitrate nitrogen content is 9.27mg / L, and COD is 21mg / L. Use the biological denitrification method proposed by the present invention to carry out deep denitrification, the details are as follows:

[0045] (1) Iron flocculation: Using ferrous sulfate as the flocculant, the dosage is 90mg / L, and the flocculation treatment process is completed by fast stirring (200r / min) for 2min, slow stirring (40r / min) for 15min, and precipitation for 30min. After coagulation treatment, the dissolved oxygen in the effluent is lower than 0.02mg / L, the ORP is -150±50mv, and the Fe(III) concentration is about 8mg / L.

[0046] (2) Biological denitrification: adjust the pH of the water body to 5, and supplement the Fe(III) concentra...

Embodiment 2

[0048] The present embodiment processes the sludge digested liquid of the urban sewage treatment plant, and the details are as follows:

[0049] Take the sludge digested liquid of a city sewage treatment plant, dilute it and use the denitrification method proposed by the present invention to carry out deep denitrification. The specific processing flow is as follows:

[0050] (1) Iron flocculation: Using ferrous sulfate as the flocculant, the dosage is 350mg / L, and the flocculation treatment process is completed by fast stirring (200r / min) for 1.5min, slow stirring (60r / min) for 18min, and precipitation for 35min. After coagulation treatment, the residual Fe(III) concentration in the water is about 25mg / L, the dissolved oxygen concentration is lower than 0.02mg / L, and the ORP is -150±50mv.

[0051] (2) Biological denitrification: adjust the pH of the coagulation effluent to 4.5, and supplement the Fe(III) concentration to about 150mg / L. The first two chambers of the ABR react...

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Abstract

The invention discloses a biological denitrification method coupled with an iron flocculation process, and relates to the technical field of wastewater denitrification. Taking the effluent of the flocculation process treated by using ferrous sulfate as a flocculant as the influent of the Feammox biological denitrification process; ferrous sulfate consumes oxygen in water in the flocculation process, and can provide anaerobic conditions for a Fammox biological denitrification reaction; meanwhile, ferrous sulfate is oxidized to form ferric iron in the flocculation process, an electron acceptor can be provided for the Feammox biological denitrification reaction, and nitrogen removal treatment is carried out on the nitrogen-containing wastewater through the Feammox biological denitrification reaction. According to the iron flocculation and Feammox coupling method provided by the invention, a new thought can be provided for meeting the requirement of Feammox on external source availability Fe (III) in the prior art; the coupling process is a whole-course autotrophic nitrogen removal process, is simple to operate, is easy to transform and upgrade, is particularly suitable for deep nitrogen removal of low C / N sewage and wastewater, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a biological denitrification method coupled with an iron flocculation process. Background technique [0002] Removal of nitrogen from water under the condition of lack of carbon source has always been a difficult point in water treatment. Traditional heterotrophic denitrification and denitrification need to rely on external carbon sources to achieve deep removal of total nitrogen, with high operating costs and an urgent need for carbon reduction. In recent years, the rapid development of anaerobic ammonium oxidation (Anammox) has attracted widespread attention. Anammox is based on nitrite (NO 2 - ) as the electron acceptor to ammonium (NH 4 + ) is oxidized to nitrogen (N 2 ), which can greatly save energy consumption. However, Anammox functional bacteria require harsh environmental conditions, long generation cycles, and require NO 2 - Accumulation in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F9/00C02F3/284C02F1/5236C02F1/66C02F2101/16Y02W10/10
Inventor 赵华章孙慧芳刘思彤李剑峰
Owner PEKING UNIV
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