Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater

A low-concentration ammonia-nitrogen, bioaugmentation technology, applied in the field of biological treatment of low-concentration ammonia-nitrogen wastewater, can solve the problems of difficult enrichment and easy loss of ammonia oxidizing bacteria, and achieve increased solid residence time, fast mass transfer, Effect of Reducing Reactor Volume

Inactive Publication Date: 2015-11-25
KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because ammonia oxidizing bacteria are sensitive to many conditions such as pH, temperature, dissolved oxygen, sludge age, and inhibitory substances, it is difficult to enrich ammonia oxidizing bacteria in actual operation.
[0005] Therefore, it is necessary to find a method to solve the disadvantages of ammonia oxidizing bacteria in the traditional biochemical system that do not have an advantage in competition with heterotrophic bacteria and are easy to lose, and give full play to their advantages of high efficiency and low energy consumption. important to deal with

Method used

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  • Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater

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Effect test

Embodiment 1

[0026] Adopt method of the present invention to process ammonia nitrogen simulated waste water, water quality is as follows: ammonia nitrogen 300mg / L, COD cr 500mg / L, put the immobilized microbial carrier into a 1L aerated biological fluidized bed according to the dosage of 15% (W / W), the pH of the influent water is about 8, the water temperature is about 30°C, and the dissolved oxygen is 5mg / L About, when the residence time is 2h, 4h, 6h, 8h, the concentration of ammonia nitrogen in the effluent is 121.01mg / L, 71.65mg / L, 22.81mg / L, 12.65mg / L; the concentration of nitrite nitrogen in the effluent is 82.11 mg / L, 117.40mg / L, 167.13mg / L, 193.72mg / L; the nitrate nitrogen in the effluent was all within 20mg / L. Under the condition of 8h residence time, the removal rate of ammonia nitrogen was 95.7%, and the reactor effluent NO 2 - / NO x - maintained above 90%. NO x The concentration can be reduced to less than 10mg / L.

Embodiment 2

[0028] Adopt method of the present invention to process ammonia nitrogen simulated waste water, water quality is as follows: ammonia nitrogen 300mg / L, COD cr 500mg / L, put the immobilized microbial carrier into a 1L aerated biological fluidized bed according to the dosage of 5% (W / W), the pH of the influent water is about 8, the water temperature is about 30°C, and the dissolved oxygen is 5mg / L About, when the residence time is 2h, 4h, 6h, 8h, 10h, the concentration of ammonia nitrogen in the effluent is 177.37mg / L, 120.22mg / L, 104.03mg / L, 68.68mg / L, 34.24mg / L; The concentrations of nitrate nitrogen were 30.91mg / L, 41.78mg / L, 63.02mg / L, 100.06mg / L, and 132.69mg / L respectively; the nitrate nitrogen in the effluent was all within 20mg / L. Under the condition of 10h residence time, the removal rate of ammonia nitrogen is 88.6%, and the reactor effluent NO 2 - / NO x - maintained above 90%. NO x The concentration can be reduced to less than 10mg / L.

Embodiment 3

[0030] Adopt the inventive method to process synthetic ammonia industrial waste water, water quality is as follows: ammonia nitrogen 120-300mg / L, COD cr200-400mg / L, continuous treatment of wastewater according to the scale of 100mL / h, the process flow of the device is anoxic tank-aerated biological fluidized bed, in which, the residence time of anoxic tank is 11h, and the residence time of aerated biological fluidized bed 11h, the dosage of immobilized carrier in the aerated biological fluidized bed embedding method is 15%, and the ammonia nitrogen in the effluent is under the conditions of influent pH=7-8, water temperature 25-35℃, dissolved oxygen 3-5mg / L The concentration is 5-15mg / L, and the removal rate of ammonia nitrogen is over 90%.

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Abstract

The invention discloses a biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater. The method employs combined anoxic-aeration biological fluidized bed technology; an anoxic reaction tank is filled with a combined microbial filling material; and an embedding-process immobilized microbial carrier is added into an aeration biological fluidized bed. The method comprises the following successive steps: allowing pretreated medium-and-low concentration ammonia-nitrogen wastewater to enter the anoxic reaction tank, removing nitrogen oxide (mainly nitrite nitrogen) in back water by using denitrifying bacteria adhered on the combined filling material and removing a part of organic matters; allowing effluent of the anoxic reaction tank to enter the aeration biological fluidized bed, wherein since the immobilized microbial carrier is in a fluidized state under aeration conditions and uniformly distributed in the fluidized bed, full contact between the carrier and the wastewater is realized; and converting ammonia nitrogen in the wastewater into nitrite nitrogen by using ammoxidation bacteria growing in the carrier and on the surface of the carrier, removing a part of total nitrogen and rest organic matters at the same time and allowing effluent to flow back to the front anoxic reaction tank.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a biological treatment method for medium and low concentration ammonia nitrogen wastewater. Specifically, the method adopts an anoxic-aerated biological fluidized bed combined treatment method, and organically combines biological fluidized bed technology and an embedding method immobilized microorganism technology group. The invention is applicable to the treatment of medium and low-concentration ammonia-nitrogen wastewater in chemical industry, aquaculture, urban sewage and the like. Background technique [0002] Ammonia nitrogen wastewater comes from many industries such as chemical industry, aquaculture, and urban sewage. The direct discharge of a large amount of ammonia nitrogen wastewater will stimulate the overgrowth of algae and other aquatic plants, resulting in eutrophication pollution such as red lakes and red tides. Some of the algae protein toxins can be Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34
Inventor 戴昕安立超曹惠忠
Owner KESHENG ENVIRONMENTAL PROTECTION TECH CO LTD
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