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A method to realize synchronous denitrification and dephosphorization of sewage

A simultaneous nitrogen and phosphorus removal and sewage technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex control and unstable biological phosphorus removal effect , to achieve the effect of wide sources, low price and cost saving

Inactive Publication Date: 2011-12-28
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for synchronous denitrification and dephosphorization of sewage in view of the shortcomings of traditional biological phosphorus and nitrogen removal methods, such as complex control and inability to obtain stable biological phosphorus removal effects. During the denitrification process, nitrate ions are reduced to nitrogen, elemental iron is oxidized to iron ions, and at the same time, iron ions and phosphate ions are combined to form precipitates, thereby realizing the dual denitrification and phosphorus removal. Effect

Method used

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  • A method to realize synchronous denitrification and dephosphorization of sewage
  • A method to realize synchronous denitrification and dephosphorization of sewage
  • A method to realize synchronous denitrification and dephosphorization of sewage

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1 is a simulation test carried out in a laboratory. The process is as follows:

[0029] 1. Isolation of autotrophic denitrifying bacteria using elemental iron as electron donor;

[0030] Anaerobic activated sludge was used as the source of strains, and the elemental iron as the final electron donor and NO 3 － As the electron acceptor, the target strain of autotrophic denitrification; the specific technical route is as follows:

[0031] (1) A liquid culture medium is used, in which reduced iron powder is added to make a selective medium, and a suspension of activated sludge is added to enrich the target bacteria. The specific components of the liquid medium are as follows: NaNO 3 250mg / L, CaCl 2 200mg / L, MgSO 4 .7H 2 O 200mg / L , K 2 HPO 4 1000mg / L, NaHCO 3 2000mg / L, NaCl 1000mg / L, trace elements 1mL / L.

[0032] (2) Appropriate agar powder is added to the liquid selection medium to make a solid medium, and the enriched target bacteria are further...

Embodiment ２

[0033] Example 2, preliminary detection of target bacterial species after purification

[0034] The purified target strains were cultured again in liquid medium, placed under strict anaerobic and facultative anaerobic conditions respectively, and their denitrification ability was initially tested, and then the obtained target strains were stored in In liquid culture medium, as inoculum microorganisms. The specific process of the preliminary detection is as follows:

[0035] The obtained isolated and purified autotrophic denitrifying strains were picked with an inoculation loop to inoculate an appropriate amount into a vial containing a liquid medium, in which NaNO 3 The concentration is 250 mg / L, and they are cultured in a constant temperature water bath at 36°C and in an anaerobic incubator. Take 3 mL of the culture solution to a sterile test tube every other day to verify the denitrification ability. The change of nitrate ion in the medium is as follows: figure 1 As...

Embodiment 3

[0042] Example 3 、 Pilot test

[0043] In order to verify the denitrification and dephosphorization mechanism using elemental iron as the electron donor, a 6-month, (design) treatment capacity of 0.6m 3 / h on-site pilot test. In the pilot test, the effluent filtered by the grid screen of the sewage treatment station is used as the influent water of the reactor, and the filtered effluent is pumped to the reactor test device, and discharged to the system pipe network after treatment.

[0044] The technical route adopted in the pilot test process is as follows:

[0045] (1) After the biochemically treatable sewage is pretreated to remove suspended solids according to the characteristics of the wastewater, it first enters the aerobic nitrification tank for oxidation treatment of organic matter, organic nitrogen and ammonia nitrogen. The microbial treatment method of the aerobic nitrification tank adopts the biofilm method ( Refers to the form of microorganisms in the ae...

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Abstract

A method for realizing synchronous denitrification and phosphorus removal of sewage, the steps are as follows: (1) use anaerobic activated sludge as the source of bacteria, and screen out the target bacteria that can use elemental iron for autotrophic denitrification; (2) use After pretreatment, the biochemically treatable sewage enters the aerobic nitrification tank for oxidation treatment of organic matter, organic nitrogen and ammonia nitrogen; (3) introduces the above-mentioned treated sewage into the denitrification tank where the mixed solution is anoxic, and adds Elemental iron and denitrifying bacteria that can use elemental iron; in the initial stage of operation, the denitrification tank runs intermittently, and after the denitrification operation is stable, it runs continuously; 4) Set up a sedimentation tank after the denitrification tank to remove iron phosphate precipitates and Suspended solids complete sewage treatment. The invention introduces elemental iron as an electron donor and nitrate as an electron acceptor, organically combines biological nitrogen removal and chemical phosphorus removal, and simultaneously realizes nitrogen and phosphorus removal.

Description

Technical field [0001] The present invention involves a method in the field of nitrogen removal and phosphorus removal and phosphorus removal technology in wastewater. It specially involves the introduction of single iron as an electronic donor and nitrate as an electronic receptor.Wastewater treatment method for nitrogen dehydration and phosphorus and phosphorus. Background technique [0002] Wastewater nitrogen removal and phosphorus removal can be achieved through biological methods and chemical methods.Among them, phosphorus removal is mainly achieved through the release of phosphorus and oxygen conditions under anaerobic conditions, and the biological excessive absorption of phosphorus is achieved, and it is completed in different reaction structures or reaction areas.Biological nitrogen dehydration is mainly used under oxygen conditions to be nitrite and nitrate. Under hypoxia conditions, the use of organic carbon sources is used as an electronic supply body to achieve nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/30
Inventor 白晓慧蒯林萍
Owner SHANGHAI JIAO TONG UNIV
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