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A wastewater denitrification method for rapidly realizing simultaneous short-range nitrification and denitrification

A short-range nitrification and denitrification technology, applied in the field of rapid sewage denitrification, can solve the problems of poor treatment capacity, long cycle and high energy consumption, and achieve the effect of improving treatment capacity, short cycle and low energy consumption

Inactive Publication Date: 2011-12-21
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of long period, high energy consumption and poor processing capacity in the existing short-range nitrification-denitrification denitrification method, and to provide a method for quickly realizing synchronous short-range nitrification-denitrification denitrification of sewage

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  • A wastewater denitrification method for rapidly realizing simultaneous short-range nitrification and denitrification
  • A wastewater denitrification method for rapidly realizing simultaneous short-range nitrification and denitrification
  • A wastewater denitrification method for rapidly realizing simultaneous short-range nitrification and denitrification

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specific Embodiment approach 1

[0016] Specific implementation mode one: the method for quickly realizing synchronous short-range nitrification-denitrification sewage denitrification in this embodiment is realized according to the following steps: 1. Inoculate aerobic denitrification bacteria into LB liquid culture medium at a temperature of 25°C and 120°C Under the aerobic condition of constant temperature and vibration for 48 hours; 2. Take 1L of the bacteria liquid after the expansion, use a low-temperature refrigerated centrifuge to centrifuge at 6000r / min for 10min, collect the bacteria and make a 25mL bacterial suspension with ultrapure water solution; 3. Mix 25mL of bacterial suspension and 50mL of embedding solution, then hang drop in 1L of cross-linking agent, and cross-link overnight at 4°C to obtain bacterial pellets; Add 500mL of bacteria balls to the 5L SBR reactor, keep the operating conditions of the SBR reactor unchanged, and after 21 days of operation, the denitrification of sewage with simul...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is that every 1000 mL of LB liquid medium in step one is composed of 10 g of tryptone, 5 g of yeast extract powder, 10 g of NaCl and the remaining water, and the pH value is 7.2 ~7.5, LB liquid medium was sterilized at 115°C for 25 minutes before use. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A sewage denitrification method for rapidly realizing synchronous short-range nitrification-denitrification relates to a rapid sewage denitrification method. Methods: 1. Expanded culture of aerobic denitrifying bacteria; 2. Centrifuge the expanded cultured bacteria liquid to collect the bacteria and make a bacterial suspension; 3. Mix the bacterial suspension with the embedding solution, and then drop it on Cross-link in the agent overnight to get the bacterium ball; 4. Add the bacterium ball to the SBR reactor that has realized the short-cut nitrification to complete. In the present invention, adding the fungus balls to the SBR reactor does not affect the operation of the short-range process, and at the same time, it can effectively denitrify NO2--N into nitrogen to realize synchronous removal, and the removal effect of ammonia nitrogen is stable, which can be maintained at more than 90%. Ammonia nitrogen can basically be maintained below 5mg / L; the COD removal rate reaches over 90%, and the average COD of the effluent is 25.5mg / L; effectively improves the processing capacity of the process for pollutants, with short cycles and low energy consumption.

Description

technical field [0001] The invention relates to a fast sewage denitrification method. Background technique [0002] Compared with the traditional biological denitrification technology, the short-cut nitrification denitrification technology has the advantages of short technical cycle, low energy consumption, and small sludge volume, so it is considered to have broad application prospects. However, when the process realizes the accumulation of nitrite nitrogen It is still necessary to add carbon source and remove nitrite nitrogen into nitrogen under anoxic conditions. However, in the actual sewage treatment process, the AOB bacteria group that converts ammonia nitrogen into nitrite nitrogen belongs to chemoautotrophy Therefore, most of the COD in the initial water quality is used by heterotrophic bacteria. If this part of COD can be effectively used for denitrification, the operating cost can be further reduced. [0003] Under aerobic aeration denitrification conditions, sync...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 万芳杜茂安杨雪万春黎
Owner HARBIN INST OF TECH
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