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Culture method of aerobic nitrosification granule sludge

A technology of nitrosation granules and cultivation method, which is applied in the field of cultivation of domestic sewage nitrosation granular sludge, can solve the problems of long enrichment and acclimation time of dominant bacteria, low effect of ammonia nitrogen oxidation, and high requirements for bio-retention capacity of reactors, and achieve removal The effect of improving efficiency and operation stability

Active Publication Date: 2014-02-26
BEIJING UNIV OF TECH
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Problems solved by technology

However, the growth rate of aerobic ammonia oxidizing bacteria is slow, the cell yield is low, and they are sensitive to environmental changes, resulting in long enrichment and domestication of dominant bacteria, low treatment efficiency, and high requirements for the bioretention capacity of the reactor.
Many researchers use low dissolved oxygen strategy to inhibit the growth of nitric acid bacteria, but this strategy makes the oxidation effect of ammonia nitrogen very low, which makes the nitrification rate low. Nitrosification is controlled by the inhibition of nitrosation, the concentration of ammonia nitrogen in the effluent is still at a relatively high concentration, and nitrosating bacteria are adaptable to free ammonia, and the effect of nitrosation is difficult to maintain stably

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  • Culture method of aerobic nitrosification granule sludge

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Embodiment Construction

[0013] 1. Reactor device such as figure 1 shown.

[0014] 2. The influent used in the example is the domestic sewage of the residential area, the concentration of ammonia nitrogen in the influent is 60-80mg / l, the concentration of nitrate nitrogen is less than 1mg / l, the concentration of nitrous nitrogen is less than 1mg / l, and the concentration of COD is 160mg / l-250mg / l.

[0015] 3. The operation steps of the above method are as follows:

[0016] 1) Inoculation sludge: inoculate the anammox granular sludge in the anammox reactor, the influent ammonia nitrogen concentration of the anammox reactor is 40-50mg / l, and the nitrous concentration is 50-60mg / l , The total nitrogen removal load is 0.3-0.4kg / (kgvss·d). The particle size of the inoculation sludge is 1.0-2.0mm, and the sludge concentration in the reactor after inoculation is 500mg / l-1000mg / l.

[0017] 2) Start-up stage: SBR reactor is used with an effective volume of 70L. The SBR operation cycle is: water intake, aera...

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Abstract

The invention discloses a culture method of municipal sewage nitrosification granule sludge, belonging to the field of restoration and regeneration of an aquatic environment. The invention aims to solve the problems of low carbon-nitrogen ratio, low denitrification efficiency and waste of abundant energy sources in the municipal sewage. The method comprises steps: anaerobic ammoxidation granule sludge is inoculated in an SBR (sequencing batch reactor); by using domestic sewage as raw water, the dissolved oxygen in the reactor is controlled at 4 mg / L or more, the stirring speed is controlled at 100 r / min, the temperature is controlled at 30 DEG C, the hydraulic retention time is controlled at 8 hours, and the sedimentation time is controlled at 5 minutes; the aerobic ammoxidation bacterium AOB and denitrifying bacterium can form granule sludge with anaerobic ammoxidation granule sludge as core; the shearing force generated by aeration can provide selection pressure for the formation of the granule sludge and promote the formation of the granule sludge; and the short sedimentation time is beneficial to elimination of nitrobacteria, thereby keeping the nitrosification stable. By using the method, the ammonia nitrogen removal ratio is up to 100%, and the nitrogen accumulation rate is higher than 95%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a method for cultivating domestic sewage nitrosation granular sludge. Background technique [0002] The traditional biological denitrification of urban domestic sewage adopts nitrification and denitrification process, which has the problems of insufficient carbon source and large aeration consumption. Nitrite-based biological denitrification technology has the advantages of reducing energy consumption, saving carbon sources, and reducing sludge generation. However, the growth rate of aerobic ammonia oxidizing bacteria is slow, the cell yield is low, and they are sensitive to environmental changes, resulting in long enrichment and acclimation time for dominant bacteria, low treatment efficiency, and high requirements for the bioretention capacity of the reactor. Many researchers use low dissolved oxygen strategy to inhibit the growth of nitric acid bacteria, but this strat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李军郑照明刘常敬陈光辉卞伟
Owner BEIJING UNIV OF TECH
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